Merge branch 'caldav'

26 files changed, 13775 insertions, 0 deletions

diff --git a/aero-dav/.gitignore b/aero-dav/.gitignore
new file mode 100644
index 0000000..2f7896d
--- /dev/null
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diff --git a/aero-dav/Cargo.toml b/aero-dav/Cargo.toml
new file mode 100644
index 0000000..c847f68
--- /dev/null
+++ b/aero-dav/Cargo.toml
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diff --git a/aero-dav/fuzz/.gitignore b/aero-dav/fuzz/.gitignore
new file mode 100644
index 0000000..1a45eee
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index 0000000..08fa951
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new file mode 100644
index 0000000..3ef5b69
--- /dev/null
+++ b/aero-dav/fuzz/dav.dict
@@ -0,0 +1,126 @@
+#
+# AFL dictionary for XML
+# ----------------------
+#
+# Several basic syntax elements and attributes, modeled on libxml2.
+#
+# Created by Michal Zalewski
+#
+
+attr_encoding=" encoding=\"1\""
+attr_generic=" a=\"1\""
+attr_href=" href=\"1\""
+attr_standalone=" standalone=\"no\""
+attr_version=" version=\"1\""
+attr_xml_base=" xml:base=\"1\""
+attr_xml_id=" xml:id=\"1\""
+attr_xml_lang=" xml:lang=\"1\""
+attr_xml_space=" xml:space=\"1\""
+attr_xmlns=" xmlns=\"1\""
+
+entity_builtin="&lt;"
+entity_decimal="&#1;"
+entity_external="&a;"
+entity_hex="&#x1;"
+
+string_any="ANY"
+string_brackets="[]"
+string_cdata="CDATA"
+string_col_fallback=":fallback"
+string_col_generic=":a"
+string_col_include=":include"
+string_dashes="--"
+string_empty="EMPTY"
+string_empty_dblquotes="\"\""
+string_empty_quotes="''"
+string_entities="ENTITIES"
+string_entity="ENTITY"
+string_fixed="#FIXED"
+string_id="ID"
+string_idref="IDREF"
+string_idrefs="IDREFS"
+string_implied="#IMPLIED"
+string_nmtoken="NMTOKEN"
+string_nmtokens="NMTOKENS"
+string_notation="NOTATION"
+string_parentheses="()"
+string_pcdata="#PCDATA"
+string_percent="%a"
+string_public="PUBLIC"
+string_required="#REQUIRED"
+string_schema=":schema"
+string_system="SYSTEM"
+string_ucs4="UCS-4"
+string_utf16="UTF-16"
+string_utf8="UTF-8"
+string_xmlns="xmlns:"
+
+tag_attlist="<!ATTLIST"
+tag_cdata="<![CDATA["
+tag_close="</a>"
+tag_doctype="<!DOCTYPE"
+tag_element="<!ELEMENT"
+tag_entity="<!ENTITY"
+tag_ignore="<![IGNORE["
+tag_include="<![INCLUDE["
+tag_notation="<!NOTATION"
+tag_open="<a>"
+tag_open_close="<a />"
+tag_open_exclamation="<!"
+tag_open_q="<?"
+tag_sq2_close="]]>"
+tag_xml_q="<?xml?>"
+
+"0"
+"1"
+"activelock"
+"allprop"
+"cannot-modify-protected-property"
+"collection"
+"creationdate"
+"DAV:"
+"depth"
+"displayname"
+"error"
+"exclusive"
+"getcontentlanguage"
+"getcontentlength"
+"getcontenttype"
+"getetag"
+"getlastmodified"
+"href"
+"include"
+"Infinite"
+"infinity"
+"location"
+"lockdiscovery"
+"lockentry"
+"lockinfo"
+"lockroot"
+"lockscope"
+"locktoken"
+"lock-token-matches-request-uri"
+"lock-token-submitted"
+"locktype"
+"multistatus"
+"no-conflicting-lock"
+"no-external-entities"
+"owner"
+"preserved-live-properties"
+"prop"
+"propertyupdate"
+"propfind"
+"propfind-finite-depth"
+"propname"
+"propstat"
+"remove"
+"resourcetype"
+"response"
+"responsedescription"
+"set"
+"shared"
+"status"
+"supportedlock"
+"text/html"
+"timeout"
+"write"
diff --git a/aero-dav/fuzz/fuzz_targets/dav.rs b/aero-dav/fuzz/fuzz_targets/dav.rs
new file mode 100644
index 0000000..a303401
--- /dev/null
+++ b/aero-dav/fuzz/fuzz_targets/dav.rs
@@ -0,0 +1,209 @@
+#![no_main]
+
+use libfuzzer_sys::arbitrary;
+use libfuzzer_sys::arbitrary::Arbitrary;
+use libfuzzer_sys::fuzz_target;
+
+use aero_dav::{realization, types, xml};
+use quick_xml::reader::NsReader;
+use tokio::io::AsyncWriteExt;
+use tokio::runtime::Runtime;
+
+// Split this file
+const tokens: [&str; 63] = [
+    "0",
+    "1",
+    "activelock",
+    "allprop",
+    "encoding",
+    "utf-8",
+    "http://ns.example.com/boxschema/",
+    "HTTP/1.1 200 OK",
+    "1997-12-01T18:27:21-08:00",
+    "Mon, 12 Jan 1998 09:25:56 GMT",
+    "\"abcdef\"",
+    "cannot-modify-protected-property",
+    "collection",
+    "creationdate",
+    "DAV:",
+    "D",
+    "C",
+    "xmlns:D",
+    "depth",
+    "displayname",
+    "error",
+    "exclusive",
+    "getcontentlanguage",
+    "getcontentlength",
+    "getcontenttype",
+    "getetag",
+    "getlastmodified",
+    "href",
+    "include",
+    "Infinite",
+    "infinity",
+    "location",
+    "lockdiscovery",
+    "lockentry",
+    "lockinfo",
+    "lockroot",
+    "lockscope",
+    "locktoken",
+    "lock-token-matches-request-uri",
+    "lock-token-submitted",
+    "locktype",
+    "multistatus",
+    "no-conflicting-lock",
+    "no-external-entities",
+    "owner",
+    "preserved-live-properties",
+    "prop",
+    "propertyupdate",
+    "propfind",
+    "propfind-finite-depth",
+    "propname",
+    "propstat",
+    "remove",
+    "resourcetype",
+    "response",
+    "responsedescription",
+    "set",
+    "shared",
+    "status",
+    "supportedlock",
+    "text/html",
+    "timeout",
+    "write",
+];
+
+#[derive(Arbitrary)]
+enum Token {
+    Known(usize),
+    //Unknown(String),
+}
+impl Token {
+    fn serialize(&self) -> String {
+        match self {
+            Self::Known(i) => tokens[i % tokens.len()].to_string(),
+            //Self::Unknown(v) => v.to_string(),
+        }
+    }
+}
+
+#[derive(Arbitrary)]
+struct Tag {
+    //prefix: Option<Token>,
+    name: Token,
+    attr: Option<(Token, Token)>,
+}
+impl Tag {
+    fn start(&self) -> String {
+        let mut acc = String::new();
+        /*if let Some(p) = &self.prefix {
+            acc.push_str(p.serialize().as_str());
+            acc.push_str(":");
+        }*/
+        acc.push_str("D:");
+        acc.push_str(self.name.serialize().as_str());
+
+        if let Some((k, v)) = &self.attr {
+            acc.push_str(" ");
+            acc.push_str(k.serialize().as_str());
+            acc.push_str("=\"");
+            acc.push_str(v.serialize().as_str());
+            acc.push_str("\"");
+        }
+        acc
+    }
+    fn end(&self) -> String {
+        let mut acc = String::new();
+        acc.push_str("D:");
+        acc.push_str(self.name.serialize().as_str());
+        acc
+    }
+}
+
+#[derive(Arbitrary)]
+enum XmlNode {
+    //@FIXME: build RFC3339 and RFC822 Dates with chrono based on timestamps
+    //@FIXME: add small numbers
+    //@FIXME: add http status code
+    Node(Tag, Vec<Self>),
+    Number(u64),
+    Text(Token),
+}
+impl std::fmt::Debug for XmlNode {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(f, "{}", self.serialize())
+    }
+}
+impl XmlNode {
+    fn serialize(&self) -> String {
+        match self {
+            Self::Node(tag, children) => {
+                let stag = tag.start();
+                match children.is_empty() {
+                    true => format!("<{}/>", stag),
+                    false => format!(
+                        "<{}>{}</{}>",
+                        stag,
+                        children.iter().map(|v| v.serialize()).collect::<String>(),
+                        tag.end()
+                    ),
+                }
+            }
+            Self::Number(v) => format!("{}", v),
+            Self::Text(v) => v.serialize(),
+        }
+    }
+}
+
+async fn serialize(elem: &impl xml::QWrite) -> Vec<u8> {
+    let mut buffer = Vec::new();
+    let mut tokio_buffer = tokio::io::BufWriter::new(&mut buffer);
+    let q = quick_xml::writer::Writer::new_with_indent(&mut tokio_buffer, b' ', 4);
+    let ns_to_apply = vec![("xmlns:D".into(), "DAV:".into())];
+    let mut writer = xml::Writer { q, ns_to_apply };
+
+    elem.qwrite(&mut writer).await.expect("xml serialization");
+    tokio_buffer.flush().await.expect("tokio buffer flush");
+
+    return buffer;
+}
+
+type Object = types::Multistatus<realization::Core, types::PropValue<realization::Core>>;
+
+fuzz_target!(|nodes: XmlNode| {
+    let gen = format!(
+        "<D:multistatus xmlns:D=\"DAV:\">{}<D:/multistatus>",
+        nodes.serialize()
+    );
+    //println!("--------\n{}", gen);
+    let data = gen.as_bytes();
+
+    let rt = Runtime::new().expect("tokio runtime initialization");
+
+    rt.block_on(async {
+        // 1. Setup fuzzing by finding an input that seems correct, do not crash yet then.
+        let mut rdr = match xml::Reader::new(NsReader::from_reader(data)).await {
+            Err(_) => return,
+            Ok(r) => r,
+        };
+        let reference = match rdr.find::<Object>().await {
+            Err(_) => return,
+            Ok(m) => m,
+        };
+
+        // 2. Re-serialize the input
+        let my_serialization = serialize(&reference).await;
+
+        // 3. De-serialize my serialization
+        let mut rdr2 = xml::Reader::new(NsReader::from_reader(my_serialization.as_slice()))
+            .await
+            .expect("XML Reader init");
+        let comparison = rdr2.find::<Object>().await.expect("Deserialize again");
+
+        // 4. Both the first decoding and last decoding must be identical
+        assert_eq!(reference, comparison);
+    })
+});
diff --git a/aero-dav/src/acldecoder.rs b/aero-dav/src/acldecoder.rs
new file mode 100644
index 0000000..405286e
--- /dev/null
+++ b/aero-dav/src/acldecoder.rs
@@ -0,0 +1,84 @@
+use super::acltypes::*;
+use super::error::ParsingError;
+use super::types as dav;
+use super::xml::{IRead, QRead, Reader, DAV_URN};
+
+impl QRead<Property> for Property {
+    async fn qread(xml: &mut Reader<impl IRead>) -> Result<Self, ParsingError> {
+        if xml.maybe_open_start(DAV_URN, "owner").await?.is_some() {
+            let href = xml.find().await?;
+            xml.close().await?;
+            return Ok(Self::Owner(href));
+        }
+        if xml
+            .maybe_open_start(DAV_URN, "current-user-principal")
+            .await?
+            .is_some()
+        {
+            let user = xml.find().await?;
+            xml.close().await?;
+            return Ok(Self::CurrentUserPrincipal(user));
+        }
+        if xml
+            .maybe_open_start(DAV_URN, "current-user-privilege-set")
+            .await?
+            .is_some()
+        {
+            xml.close().await?;
+            return Ok(Self::CurrentUserPrivilegeSet(vec![]));
+        }
+
+        Err(ParsingError::Recoverable)
+    }
+}
+
+impl QRead<PropertyRequest> for PropertyRequest {
+    async fn qread(xml: &mut Reader<impl IRead>) -> Result<Self, ParsingError> {
+        if xml.maybe_open(DAV_URN, "owner").await?.is_some() {
+            xml.close().await?;
+            return Ok(Self::Owner);
+        }
+
+        if xml
+            .maybe_open(DAV_URN, "current-user-principal")
+            .await?
+            .is_some()
+        {
+            xml.close().await?;
+            return Ok(Self::CurrentUserPrincipal);
+        }
+
+        if xml
+            .maybe_open(DAV_URN, "current-user-privilege-set")
+            .await?
+            .is_some()
+        {
+            xml.close().await?;
+            return Ok(Self::CurrentUserPrivilegeSet);
+        }
+
+        Err(ParsingError::Recoverable)
+    }
+}
+
+impl QRead<ResourceType> for ResourceType {
+    async fn qread(xml: &mut Reader<impl IRead>) -> Result<Self, ParsingError> {
+        if xml.maybe_open(DAV_URN, "principal").await?.is_some() {
+            xml.close().await?;
+            return Ok(Self::Principal);
+        }
+        Err(ParsingError::Recoverable)
+    }
+}
+
+// -----
+impl QRead<User> for User {
+    async fn qread(xml: &mut Reader<impl IRead>) -> Result<Self, ParsingError> {
+        if xml.maybe_open(DAV_URN, "unauthenticated").await?.is_some() {
+            xml.close().await?;
+            return Ok(Self::Unauthenticated);
+        }
+
+        dav::Href::qread(xml).await.map(Self::Authenticated)
+    }
+}
diff --git a/aero-dav/src/aclencoder.rs b/aero-dav/src/aclencoder.rs
new file mode 100644
index 0000000..28c01a7
--- /dev/null
+++ b/aero-dav/src/aclencoder.rs
@@ -0,0 +1,71 @@
+use quick_xml::events::Event;
+use quick_xml::Error as QError;
+
+use super::acltypes::*;
+use super::error::ParsingError;
+use super::xml::{IWrite, QWrite, Writer};
+
+impl QWrite for Property {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        match self {
+            Self::Owner(href) => {
+                let start = xml.create_dav_element("owner");
+                let end = start.to_end();
+                xml.q.write_event_async(Event::Start(start.clone())).await?;
+                href.qwrite(xml).await?;
+                xml.q.write_event_async(Event::End(end)).await
+            }
+            Self::CurrentUserPrincipal(user) => {
+                let start = xml.create_dav_element("current-user-principal");
+                let end = start.to_end();
+                xml.q.write_event_async(Event::Start(start.clone())).await?;
+                user.qwrite(xml).await?;
+                xml.q.write_event_async(Event::End(end)).await
+            }
+            Self::CurrentUserPrivilegeSet(_) => {
+                let empty_tag = xml.create_dav_element("current-user-privilege-set");
+                xml.q.write_event_async(Event::Empty(empty_tag)).await
+            }
+        }
+    }
+}
+
+impl QWrite for PropertyRequest {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        let mut atom = async |c| {
+            let empty_tag = xml.create_dav_element(c);
+            xml.q.write_event_async(Event::Empty(empty_tag)).await
+        };
+
+        match self {
+            Self::Owner => atom("owner").await,
+            Self::CurrentUserPrincipal => atom("current-user-principal").await,
+            Self::CurrentUserPrivilegeSet => atom("current-user-privilege-set").await,
+        }
+    }
+}
+
+impl QWrite for ResourceType {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        match self {
+            Self::Principal => {
+                let empty_tag = xml.create_dav_element("principal");
+                xml.q.write_event_async(Event::Empty(empty_tag)).await
+            }
+        }
+    }
+}
+
+// -----
+
+impl QWrite for User {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        match self {
+            Self::Unauthenticated => {
+                let tag = xml.create_dav_element("unauthenticated");
+                xml.q.write_event_async(Event::Empty(tag)).await
+            }
+            Self::Authenticated(href) => href.qwrite(xml).await,
+        }
+    }
+}
diff --git a/aero-dav/src/acltypes.rs b/aero-dav/src/acltypes.rs
new file mode 100644
index 0000000..0af3c8a
--- /dev/null
+++ b/aero-dav/src/acltypes.rs
@@ -0,0 +1,38 @@
+use super::types as dav;
+
+//RFC covered: RFC3744 (ACL core) + RFC5397 (ACL Current Principal Extension)
+
+//@FIXME required for a full CalDAV implementation
+// See section 6. of the CalDAV RFC
+// It seems mainly required for free-busy that I will not implement now.
+// It can also be used for discovering main calendar, not sure it is used.
+// Note: it is used by Thunderbird
+
+#[derive(Debug, PartialEq, Clone)]
+pub enum PropertyRequest {
+    Owner,
+    CurrentUserPrincipal,
+    CurrentUserPrivilegeSet,
+}
+
+#[derive(Debug, PartialEq, Clone)]
+pub enum Property {
+    Owner(dav::Href),
+    CurrentUserPrincipal(User),
+    CurrentUserPrivilegeSet(Vec<Privilege>),
+}
+
+#[derive(Debug, PartialEq, Clone)]
+pub enum ResourceType {
+    Principal,
+}
+
+/// Not implemented, it's a placeholder
+#[derive(Debug, PartialEq, Clone)]
+pub struct Privilege(());
+
+#[derive(Debug, PartialEq, Clone)]
+pub enum User {
+    Unauthenticated,
+    Authenticated(dav::Href),
+}
diff --git a/aero-dav/src/caldecoder.rs b/aero-dav/src/caldecoder.rs
new file mode 100644
index 0000000..9ed783a
--- /dev/null
+++ b/aero-dav/src/caldecoder.rs
@@ -0,0 +1,1421 @@
+use chrono::NaiveDateTime;
+use quick_xml::events::Event;
+
+use super::caltypes::*;
+use super::error::ParsingError;
+use super::types as dav;
+use super::xml::{IRead, QRead, Reader, CAL_URN, DAV_URN};
+
+// ---- ROOT ELEMENTS ---
+impl<E: dav::Extension> QRead<MkCalendar<E>> for MkCalendar<E> {
+    async fn qread(xml: &mut Reader<impl IRead>) -> Result<Self, ParsingError> {
+        xml.open(CAL_URN, "mkcalendar").await?;
+        let set = xml.find().await?;
+        xml.close().await?;
+        Ok(MkCalendar(set))
+    }
+}
+
+impl<E: dav::Extension> QRead<MkCalendarResponse<E>> for MkCalendarResponse<E> {
+    async fn qread(xml: &mut Reader<impl IRead>) -> Result<Self, ParsingError> {
+        xml.open(CAL_URN, "mkcalendar-response").await?;
+        let propstats = xml.collect().await?;
+        xml.close().await?;
+        Ok(MkCalendarResponse(propstats))
+    }
+}
+
+impl<E: dav::Extension> QRead<ReportType<E>> for ReportType<E> {
+    async fn qread(xml: &mut Reader<impl IRead>) -> Result<Self, ParsingError> {
+        match CalendarQuery::<E>::qread(xml).await {
+            Err(ParsingError::Recoverable) => (),
+            otherwise => return otherwise.map(Self::Query),
+        }
+
+        match CalendarMultiget::<E>::qread(xml).await {
+            Err(ParsingError::Recoverable) => (),
+            otherwise => return otherwise.map(Self::Multiget),
+        }
+
+        FreeBusyQuery::qread(xml).await.map(Self::FreeBusy)
+    }
+}
+
+impl<E: dav::Extension> QRead<CalendarQuery<E>> for CalendarQuery<E> {
+    async fn qread(xml: &mut Reader<impl IRead>) -> Result<Self, ParsingError> {
+        xml.open(CAL_URN, "calendar-query").await?;
+        let (mut selector, mut filter, mut timezone) = (None, None, None);
+        loop {
+            let mut dirty = false;
+            xml.maybe_read(&mut selector, &mut dirty).await?;
+            xml.maybe_read(&mut filter, &mut dirty).await?;
+            xml.maybe_read(&mut timezone, &mut dirty).await?;
+
+            if !dirty {
+                match xml.peek() {
+                    Event::End(_) => break,
+                    _ => xml.skip().await?,
+                };
+            }
+        }
+        xml.close().await?;
+
+        match filter {
+            Some(filter) => Ok(CalendarQuery {
+                selector,
+                filter,
+                timezone,
+            }),
+            _ => Err(ParsingError::MissingChild),
+        }
+    }
+}
+
+impl<E: dav::Extension> QRead<CalendarMultiget<E>> for CalendarMultiget<E> {
+    async fn qread(xml: &mut Reader<impl IRead>) -> Result<Self, ParsingError> {
+        xml.open(CAL_URN, "calendar-multiget").await?;
+        let mut selector = None;
+        let mut href = Vec::new();
+
+        loop {
+            let mut dirty = false;
+            xml.maybe_read(&mut selector, &mut dirty).await?;
+            xml.maybe_push(&mut href, &mut dirty).await?;
+
+            if !dirty {
+                match xml.peek() {
+                    Event::End(_) => break,
+                    _ => xml.skip().await?,
+                };
+            }
+        }
+
+        xml.close().await?;
+        Ok(CalendarMultiget { selector, href })
+    }
+}
+
+impl QRead<FreeBusyQuery> for FreeBusyQuery {
+    async fn qread(xml: &mut Reader<impl IRead>) -> Result<Self, ParsingError> {
+        xml.open(CAL_URN, "free-busy-query").await?;
+        let range = xml.find().await?;
+        xml.close().await?;
+        Ok(FreeBusyQuery(range))
+    }
+}
+
+impl QRead<ReportTypeName> for ReportTypeName {
+    async fn qread(xml: &mut Reader<impl IRead>) -> Result<Self, ParsingError> {
+        if xml.maybe_open(DAV_URN, "calendar-query").await?.is_some() {
+            xml.close().await?;
+            return Ok(Self::Query);
+        }
+        if xml
+            .maybe_open(DAV_URN, "calendar-multiget")
+            .await?
+            .is_some()
+        {
+            xml.close().await?;
+            return Ok(Self::Multiget);
+        }
+        if xml.maybe_open(DAV_URN, "free-busy-query").await?.is_some() {
+            xml.close().await?;
+            return Ok(Self::FreeBusy);
+        }
+        Err(ParsingError::Recoverable)
+    }
+}
+
+// ---- EXTENSIONS ---
+impl QRead<Violation> for Violation {
+    async fn qread(xml: &mut Reader<impl IRead>) -> Result<Self, ParsingError> {
+        if xml
+            .maybe_open(DAV_URN, "resource-must-be-null")
+            .await?
+            .is_some()
+        {
+            xml.close().await?;
+            Ok(Self::ResourceMustBeNull)
+        } else if xml.maybe_open(DAV_URN, "need-privileges").await?.is_some() {
+            xml.close().await?;
+            Ok(Self::NeedPrivileges)
+        } else if xml
+            .maybe_open(CAL_URN, "calendar-collection-location-ok")
+            .await?
+            .is_some()
+        {
+            xml.close().await?;
+            Ok(Self::CalendarCollectionLocationOk)
+        } else if xml
+            .maybe_open(CAL_URN, "valid-calendar-data")
+            .await?
+            .is_some()
+        {
+            xml.close().await?;
+            Ok(Self::ValidCalendarData)
+        } else if xml
+            .maybe_open(CAL_URN, "initialize-calendar-collection")
+            .await?
+            .is_some()
+        {
+            xml.close().await?;
+            Ok(Self::InitializeCalendarCollection)
+        } else if xml
+            .maybe_open(CAL_URN, "supported-calendar-data")
+            .await?
+            .is_some()
+        {
+            xml.close().await?;
+            Ok(Self::SupportedCalendarData)
+        } else if xml
+            .maybe_open(CAL_URN, "valid-calendar-object-resource")
+            .await?
+            .is_some()
+        {
+            xml.close().await?;
+            Ok(Self::ValidCalendarObjectResource)
+        } else if xml
+            .maybe_open(CAL_URN, "supported-calendar-component")
+            .await?
+            .is_some()
+        {
+            xml.close().await?;
+            Ok(Self::SupportedCalendarComponent)
+        } else if xml.maybe_open(CAL_URN, "no-uid-conflict").await?.is_some() {
+            let href = xml.find().await?;
+            xml.close().await?;
+            Ok(Self::NoUidConflict(href))
+        } else if xml
+            .maybe_open(CAL_URN, "max-resource-size")
+            .await?
+            .is_some()
+        {
+            xml.close().await?;
+            Ok(Self::MaxResourceSize)
+        } else if xml.maybe_open(CAL_URN, "min-date-time").await?.is_some() {
+            xml.close().await?;
+            Ok(Self::MinDateTime)
+        } else if xml.maybe_open(CAL_URN, "max-date-time").await?.is_some() {
+            xml.close().await?;
+            Ok(Self::MaxDateTime)
+        } else if xml.maybe_open(CAL_URN, "max-instances").await?.is_some() {
+            xml.close().await?;
+            Ok(Self::MaxInstances)
+        } else if xml
+            .maybe_open(CAL_URN, "max-attendees-per-instance")
+            .await?
+            .is_some()
+        {
+            xml.close().await?;
+            Ok(Self::MaxAttendeesPerInstance)
+        } else if xml.maybe_open(CAL_URN, "valid-filter").await?.is_some() {
+            xml.close().await?;
+            Ok(Self::ValidFilter)
+        } else if xml.maybe_open(CAL_URN, "supported-filter").await?.is_some() {
+            let (mut comp, mut prop, mut param) = (Vec::new(), Vec::new(), Vec::new());
+            loop {
+                let mut dirty = false;
+                xml.maybe_push(&mut comp, &mut dirty).await?;
+                xml.maybe_push(&mut prop, &mut dirty).await?;
+                xml.maybe_push(&mut param, &mut dirty).await?;
+
+                if !dirty {
+                    match xml.peek() {
+                        Event::End(_) => break,
+                        _ => xml.skip().await?,
+                    };
+                }
+            }
+            xml.close().await?;
+            Ok(Self::SupportedFilter { comp, prop, param })
+        } else if xml
+            .maybe_open(CAL_URN, "number-of-matches-within-limits")
+            .await?
+            .is_some()
+        {
+            xml.close().await?;
+            Ok(Self::NumberOfMatchesWithinLimits)
+        } else {
+            Err(ParsingError::Recoverable)
+        }
+    }
+}
+
+impl QRead<Property> for Property {
+    async fn qread(xml: &mut Reader<impl IRead>) -> Result<Self, ParsingError> {
+        if xml
+            .maybe_open_start(CAL_URN, "calendar-home-set")
+            .await?
+            .is_some()
+        {
+            let href = xml.find().await?;
+            xml.close().await?;
+            return Ok(Property::CalendarHomeSet(href));
+        }
+        if xml
+            .maybe_open_start(CAL_URN, "calendar-description")
+            .await?
+            .is_some()
+        {
+            let lang = xml.prev_attr("xml:lang");
+            let text = xml.tag_string().await?;
+            xml.close().await?;
+            return Ok(Property::CalendarDescription { lang, text });
+        }
+
+        if xml
+            .maybe_open_start(CAL_URN, "calendar-timezone")
+            .await?
+            .is_some()
+        {
+            let tz = xml.tag_string().await?;
+            xml.close().await?;
+            return Ok(Property::CalendarTimezone(tz));
+        }
+
+        if xml
+            .maybe_open_start(CAL_URN, "supported-calendar-component-set")
+            .await?
+            .is_some()
+        {
+            let comp = xml.collect().await?;
+            xml.close().await?;
+            return Ok(Property::SupportedCalendarComponentSet(comp));
+        }
+
+        if xml
+            .maybe_open_start(CAL_URN, "supported-calendar-data")
+            .await?
+            .is_some()
+        {
+            let mime = xml.collect().await?;
+            xml.close().await?;
+            return Ok(Property::SupportedCalendarData(mime));
+        }
+
+        if xml
+            .maybe_open_start(CAL_URN, "max-resource-size")
+            .await?
+            .is_some()
+        {
+            let sz = xml.tag_string().await?.parse::<u64>()?;
+            xml.close().await?;
+            return Ok(Property::MaxResourceSize(sz));
+        }
+
+        if xml
+            .maybe_open_start(CAL_URN, "max-date-time")
+            .await?
+            .is_some()
+        {
+            let dtstr = xml.tag_string().await?;
+            let dt = NaiveDateTime::parse_from_str(dtstr.as_str(), UTC_DATETIME_FMT)?.and_utc();
+            xml.close().await?;
+            return Ok(Property::MaxDateTime(dt));
+        }
+
+        if xml
+            .maybe_open_start(CAL_URN, "max-instances")
+            .await?
+            .is_some()
+        {
+            let sz = xml.tag_string().await?.parse::<u64>()?;
+            xml.close().await?;
+            return Ok(Property::MaxInstances(sz));
+        }
+
+        if xml
+            .maybe_open_start(CAL_URN, "max-attendees-per-instance")
+            .await?
+            .is_some()
+        {
+            let sz = xml.tag_string().await?.parse::<u64>()?;
+            xml.close().await?;
+            return Ok(Property::MaxAttendeesPerInstance(sz));
+        }
+
+        if xml
+            .maybe_open_start(CAL_URN, "supported-collation-set")
+            .await?
+            .is_some()
+        {
+            let cols = xml.collect().await?;
+            xml.close().await?;
+            return Ok(Property::SupportedCollationSet(cols));
+        }
+
+        let mut dirty = false;
+        let mut caldata: Option<CalendarDataPayload> = None;
+        xml.maybe_read(&mut caldata, &mut dirty).await?;
+        if let Some(cal) = caldata {
+            return Ok(Property::CalendarData(cal));
+        }
+
+        Err(ParsingError::Recoverable)
+    }
+}
+
+impl QRead<PropertyRequest> for PropertyRequest {
+    async fn qread(xml: &mut Reader<impl IRead>) -> Result<Self, ParsingError> {
+        if xml
+            .maybe_open(CAL_URN, "calendar-home-set")
+            .await?
+            .is_some()
+        {
+            xml.close().await?;
+            return Ok(Self::CalendarHomeSet);
+        }
+        if xml
+            .maybe_open(CAL_URN, "calendar-description")
+            .await?
+            .is_some()
+        {
+            xml.close().await?;
+            return Ok(Self::CalendarDescription);
+        }
+        if xml
+            .maybe_open(CAL_URN, "calendar-timezone")
+            .await?
+            .is_some()
+        {
+            xml.close().await?;
+            return Ok(Self::CalendarTimezone);
+        }
+        if xml
+            .maybe_open(CAL_URN, "supported-calendar-component-set")
+            .await?
+            .is_some()
+        {
+            xml.close().await?;
+            return Ok(Self::SupportedCalendarComponentSet);
+        }
+        if xml
+            .maybe_open(CAL_URN, "supported-calendar-data")
+            .await?
+            .is_some()
+        {
+            xml.close().await?;
+            return Ok(Self::SupportedCalendarData);
+        }
+        if xml
+            .maybe_open(CAL_URN, "max-resource-size")
+            .await?
+            .is_some()
+        {
+            xml.close().await?;
+            return Ok(Self::MaxResourceSize);
+        }
+        if xml.maybe_open(CAL_URN, "min-date-time").await?.is_some() {
+            xml.close().await?;
+            return Ok(Self::MinDateTime);
+        }
+        if xml.maybe_open(CAL_URN, "max-date-time").await?.is_some() {
+            xml.close().await?;
+            return Ok(Self::MaxDateTime);
+        }
+        if xml.maybe_open(CAL_URN, "max-instances").await?.is_some() {
+            xml.close().await?;
+            return Ok(Self::MaxInstances);
+        }
+        if xml
+            .maybe_open(CAL_URN, "max-attendees-per-instance")
+            .await?
+            .is_some()
+        {
+            xml.close().await?;
+            return Ok(Self::MaxAttendeesPerInstance);
+        }
+        if xml
+            .maybe_open(CAL_URN, "supported-collation-set")
+            .await?
+            .is_some()
+        {
+            xml.close().await?;
+            return Ok(Self::SupportedCollationSet);
+        }
+        let mut dirty = false;
+        let mut m_cdr = None;
+        xml.maybe_read(&mut m_cdr, &mut dirty).await?;
+        m_cdr
+            .ok_or(ParsingError::Recoverable)
+            .map(Self::CalendarData)
+    }
+}
+
+impl QRead<ResourceType> for ResourceType {
+    async fn qread(xml: &mut Reader<impl IRead>) -> Result<Self, ParsingError> {
+        if xml.maybe_open(CAL_URN, "calendar").await?.is_some() {
+            xml.close().await?;
+            return Ok(Self::Calendar);
+        }
+        Err(ParsingError::Recoverable)
+    }
+}
+
+// ---- INNER XML ----
+impl QRead<SupportedCollation> for SupportedCollation {
+    async fn qread(xml: &mut Reader<impl IRead>) -> Result<Self, ParsingError> {
+        xml.open(CAL_URN, "supported-collation").await?;
+        let col = Collation::new(xml.tag_string().await?);
+        xml.close().await?;
+        Ok(SupportedCollation(col))
+    }
+}
+
+impl QRead<CalendarDataPayload> for CalendarDataPayload {
+    async fn qread(xml: &mut Reader<impl IRead>) -> Result<Self, ParsingError> {
+        xml.open(CAL_URN, "calendar-data").await?;
+        let mime = CalendarDataSupport::qread(xml).await.ok();
+        let payload = xml.tag_string().await?;
+        xml.close().await?;
+        Ok(CalendarDataPayload { mime, payload })
+    }
+}
+
+impl QRead<CalendarDataSupport> for CalendarDataSupport {
+    async fn qread(xml: &mut Reader<impl IRead>) -> Result<Self, ParsingError> {
+        let ct = xml.prev_attr("content-type");
+        let vs = xml.prev_attr("version");
+        match (ct, vs) {
+            (Some(content_type), Some(version)) => Ok(Self {
+                content_type,
+                version,
+            }),
+            _ => Err(ParsingError::Recoverable),
+        }
+    }
+}
+
+impl QRead<CalendarDataRequest> for CalendarDataRequest {
+    async fn qread(xml: &mut Reader<impl IRead>) -> Result<Self, ParsingError> {
+        xml.open(CAL_URN, "calendar-data").await?;
+        let mime = CalendarDataSupport::qread(xml).await.ok();
+        let (mut comp, mut recurrence, mut limit_freebusy_set) = (None, None, None);
+
+        if !xml.parent_has_child() {
+            return Ok(Self {
+                mime,
+                comp,
+                recurrence,
+                limit_freebusy_set,
+            });
+        }
+
+        loop {
+            let mut dirty = false;
+            xml.maybe_read(&mut comp, &mut dirty).await?;
+            xml.maybe_read(&mut recurrence, &mut dirty).await?;
+            xml.maybe_read(&mut limit_freebusy_set, &mut dirty).await?;
+
+            if !dirty {
+                match xml.peek() {
+                    Event::End(_) => break,
+                    _ => xml.skip().await?,
+                };
+            }
+        }
+
+        xml.close().await?;
+        Ok(Self {
+            mime,
+            comp,
+            recurrence,
+            limit_freebusy_set,
+        })
+    }
+}
+
+impl QRead<CalendarDataEmpty> for CalendarDataEmpty {
+    async fn qread(xml: &mut Reader<impl IRead>) -> Result<Self, ParsingError> {
+        xml.open(CAL_URN, "calendar-data").await?;
+        let mime = CalendarDataSupport::qread(xml).await.ok();
+        xml.close().await?;
+        Ok(Self(mime))
+    }
+}
+
+impl QRead<Comp> for Comp {
+    async fn qread(xml: &mut Reader<impl IRead>) -> Result<Self, ParsingError> {
+        let (mut prop_kind, mut comp_kind) = (None, None);
+
+        let bs = xml.open(CAL_URN, "comp").await?;
+        let name = Component::new(
+            xml.prev_attr("name")
+                .ok_or(ParsingError::MissingAttribute)?,
+        );
+
+        // Return early if it's an empty tag
+        if matches!(bs, Event::Empty(_)) {
+            xml.close().await?;
+            return Ok(Self {
+                name,
+                prop_kind,
+                comp_kind,
+            });
+        }
+
+        loop {
+            let mut dirty = false;
+            let (mut tmp_prop_kind, mut tmp_comp_kind): (Option<PropKind>, Option<CompKind>) =
+                (None, None);
+
+            xml.maybe_read(&mut tmp_prop_kind, &mut dirty).await?;
+            Box::pin(xml.maybe_read(&mut tmp_comp_kind, &mut dirty)).await?;
+
+            //@FIXME hack
+            // Merge
+            match (tmp_prop_kind, &mut prop_kind) {
+                (Some(PropKind::Prop(mut a)), Some(PropKind::Prop(ref mut b))) => b.append(&mut a),
+                (Some(PropKind::AllProp), v) => *v = Some(PropKind::AllProp),
+                (Some(x), b) => *b = Some(x),
+                (None, _) => (),
+            };
+            match (tmp_comp_kind, &mut comp_kind) {
+                (Some(CompKind::Comp(mut a)), Some(CompKind::Comp(ref mut b))) => b.append(&mut a),
+                (Some(CompKind::AllComp), v) => *v = Some(CompKind::AllComp),
+                (Some(a), b) => *b = Some(a),
+                (None, _) => (),
+            };
+
+            if !dirty {
+                match xml.peek() {
+                    Event::End(_) => break,
+                    _ => xml.skip().await?,
+                };
+            }
+        }
+
+        xml.close().await?;
+        Ok(Self {
+            name,
+            prop_kind,
+            comp_kind,
+        })
+    }
+}
+
+impl QRead<CompSupport> for CompSupport {
+    async fn qread(xml: &mut Reader<impl IRead>) -> Result<Self, ParsingError> {
+        xml.open(CAL_URN, "comp").await?;
+        let inner = Component::new(
+            xml.prev_attr("name")
+                .ok_or(ParsingError::MissingAttribute)?,
+        );
+        xml.close().await?;
+        Ok(Self(inner))
+    }
+}
+
+impl QRead<CompKind> for CompKind {
+    async fn qread(xml: &mut Reader<impl IRead>) -> Result<Self, ParsingError> {
+        let mut comp = Vec::new();
+        loop {
+            let mut dirty = false;
+
+            if xml.maybe_open(CAL_URN, "allcomp").await?.is_some() {
+                xml.close().await?;
+                return Ok(CompKind::AllComp);
+            }
+
+            xml.maybe_push(&mut comp, &mut dirty).await?;
+
+            if !dirty {
+                break;
+            }
+        }
+        match &comp[..] {
+            [] => Err(ParsingError::Recoverable),
+            _ => Ok(CompKind::Comp(comp)),
+        }
+    }
+}
+
+impl QRead<PropKind> for PropKind {
+    async fn qread(xml: &mut Reader<impl IRead>) -> Result<Self, ParsingError> {
+        let mut prop = Vec::new();
+        loop {
+            let mut dirty = false;
+
+            if xml.maybe_open(CAL_URN, "allprop").await?.is_some() {
+                xml.close().await?;
+                return Ok(PropKind::AllProp);
+            }
+
+            xml.maybe_push(&mut prop, &mut dirty).await?;
+
+            if !dirty {
+                break;
+            }
+        }
+
+        match &prop[..] {
+            [] => Err(ParsingError::Recoverable),
+            _ => Ok(PropKind::Prop(prop)),
+        }
+    }
+}
+
+impl QRead<RecurrenceModifier> for RecurrenceModifier {
+    async fn qread(xml: &mut Reader<impl IRead>) -> Result<Self, ParsingError> {
+        match Expand::qread(xml).await {
+            Err(ParsingError::Recoverable) => (),
+            otherwise => return otherwise.map(RecurrenceModifier::Expand),
+        }
+        LimitRecurrenceSet::qread(xml)
+            .await
+            .map(RecurrenceModifier::LimitRecurrenceSet)
+    }
+}
+
+impl QRead<Expand> for Expand {
+    async fn qread(xml: &mut Reader<impl IRead>) -> Result<Self, ParsingError> {
+        xml.open(CAL_URN, "expand").await?;
+        let (rstart, rend) = match (xml.prev_attr("start"), xml.prev_attr("end")) {
+            (Some(start), Some(end)) => (start, end),
+            _ => return Err(ParsingError::MissingAttribute),
+        };
+
+        let start = NaiveDateTime::parse_from_str(rstart.as_str(), UTC_DATETIME_FMT)?.and_utc();
+        let end = NaiveDateTime::parse_from_str(rend.as_str(), UTC_DATETIME_FMT)?.and_utc();
+        if start > end {
+            return Err(ParsingError::InvalidValue);
+        }
+
+        xml.close().await?;
+        Ok(Expand(start, end))
+    }
+}
+
+impl QRead<LimitRecurrenceSet> for LimitRecurrenceSet {
+    async fn qread(xml: &mut Reader<impl IRead>) -> Result<Self, ParsingError> {
+        xml.open(CAL_URN, "limit-recurrence-set").await?;
+        let (rstart, rend) = match (xml.prev_attr("start"), xml.prev_attr("end")) {
+            (Some(start), Some(end)) => (start, end),
+            _ => return Err(ParsingError::MissingAttribute),
+        };
+
+        let start = NaiveDateTime::parse_from_str(rstart.as_str(), UTC_DATETIME_FMT)?.and_utc();
+        let end = NaiveDateTime::parse_from_str(rend.as_str(), UTC_DATETIME_FMT)?.and_utc();
+        if start > end {
+            return Err(ParsingError::InvalidValue);
+        }
+
+        xml.close().await?;
+        Ok(LimitRecurrenceSet(start, end))
+    }
+}
+
+impl QRead<LimitFreebusySet> for LimitFreebusySet {
+    async fn qread(xml: &mut Reader<impl IRead>) -> Result<Self, ParsingError> {
+        xml.open(CAL_URN, "limit-freebusy-set").await?;
+        let (rstart, rend) = match (xml.prev_attr("start"), xml.prev_attr("end")) {
+            (Some(start), Some(end)) => (start, end),
+            _ => return Err(ParsingError::MissingAttribute),
+        };
+
+        let start = NaiveDateTime::parse_from_str(rstart.as_str(), UTC_DATETIME_FMT)?.and_utc();
+        let end = NaiveDateTime::parse_from_str(rend.as_str(), UTC_DATETIME_FMT)?.and_utc();
+        if start > end {
+            return Err(ParsingError::InvalidValue);
+        }
+
+        xml.close().await?;
+        Ok(LimitFreebusySet(start, end))
+    }
+}
+
+impl<E: dav::Extension> QRead<CalendarSelector<E>> for CalendarSelector<E> {
+    async fn qread(xml: &mut Reader<impl IRead>) -> Result<Self, ParsingError> {
+        // allprop
+        if let Some(_) = xml.maybe_open(DAV_URN, "allprop").await? {
+            xml.close().await?;
+            return Ok(Self::AllProp);
+        }
+
+        // propname
+        if let Some(_) = xml.maybe_open(DAV_URN, "propname").await? {
+            xml.close().await?;
+            return Ok(Self::PropName);
+        }
+
+        // prop
+        let (mut maybe_prop, mut dirty) = (None, false);
+        xml.maybe_read::<dav::PropName<E>>(&mut maybe_prop, &mut dirty)
+            .await?;
+        if let Some(prop) = maybe_prop {
+            return Ok(Self::Prop(prop));
+        }
+
+        Err(ParsingError::Recoverable)
+    }
+}
+
+impl QRead<CompFilter> for CompFilter {
+    async fn qread(xml: &mut Reader<impl IRead>) -> Result<Self, ParsingError> {
+        xml.open(CAL_URN, "comp-filter").await?;
+        let name = Component::new(
+            xml.prev_attr("name")
+                .ok_or(ParsingError::MissingAttribute)?,
+        );
+        let additional_rules = Box::pin(xml.maybe_find()).await?;
+        xml.close().await?;
+        Ok(Self {
+            name,
+            additional_rules,
+        })
+    }
+}
+
+impl QRead<CompFilterRules> for CompFilterRules {
+    async fn qread(xml: &mut Reader<impl IRead>) -> Result<Self, ParsingError> {
+        let mut time_range = None;
+        let mut prop_filter = Vec::new();
+        let mut comp_filter = Vec::new();
+
+        loop {
+            let mut dirty = false;
+
+            if xml.maybe_open(CAL_URN, "is-not-defined").await?.is_some() {
+                xml.close().await?;
+                return Ok(Self::IsNotDefined);
+            }
+
+            xml.maybe_read(&mut time_range, &mut dirty).await?;
+            xml.maybe_push(&mut prop_filter, &mut dirty).await?;
+            xml.maybe_push(&mut comp_filter, &mut dirty).await?;
+
+            if !dirty {
+                match xml.peek() {
+                    Event::End(_) => break,
+                    _ => xml.skip().await?,
+                };
+            }
+        }
+
+        match (&time_range, &prop_filter[..], &comp_filter[..]) {
+            (None, [], []) => Err(ParsingError::Recoverable),
+            _ => Ok(Self::Matches(CompFilterMatch {
+                time_range,
+                prop_filter,
+                comp_filter,
+            })),
+        }
+    }
+}
+
+impl QRead<CompFilterMatch> for CompFilterMatch {
+    async fn qread(_xml: &mut Reader<impl IRead>) -> Result<Self, ParsingError> {
+        unreachable!();
+    }
+}
+
+impl QRead<PropFilter> for PropFilter {
+    async fn qread(xml: &mut Reader<impl IRead>) -> Result<Self, ParsingError> {
+        xml.open(CAL_URN, "prop-filter").await?;
+        let name = ComponentProperty(
+            xml.prev_attr("name")
+                .ok_or(ParsingError::MissingAttribute)?,
+        );
+        let additional_rules = xml.maybe_find().await?;
+        xml.close().await?;
+        Ok(Self {
+            name,
+            additional_rules,
+        })
+    }
+}
+
+impl QRead<PropFilterRules> for PropFilterRules {
+    async fn qread(xml: &mut Reader<impl IRead>) -> Result<Self, ParsingError> {
+        let mut time_or_text = None;
+        let mut param_filter = Vec::new();
+
+        loop {
+            let mut dirty = false;
+
+            if xml.maybe_open(CAL_URN, "is-not-defined").await?.is_some() {
+                xml.close().await?;
+                return Ok(Self::IsNotDefined);
+            }
+
+            xml.maybe_read(&mut time_or_text, &mut dirty).await?;
+            xml.maybe_push(&mut param_filter, &mut dirty).await?;
+
+            if !dirty {
+                match xml.peek() {
+                    Event::End(_) => break,
+                    _ => xml.skip().await?,
+                };
+            }
+        }
+
+        match (&time_or_text, &param_filter[..]) {
+            (None, []) => Err(ParsingError::Recoverable),
+            _ => Ok(PropFilterRules::Match(PropFilterMatch {
+                time_or_text,
+                param_filter,
+            })),
+        }
+    }
+}
+
+impl QRead<PropFilterMatch> for PropFilterMatch {
+    async fn qread(_xml: &mut Reader<impl IRead>) -> Result<Self, ParsingError> {
+        unreachable!();
+    }
+}
+
+impl QRead<ParamFilter> for ParamFilter {
+    async fn qread(xml: &mut Reader<impl IRead>) -> Result<Self, ParsingError> {
+        xml.open(CAL_URN, "param-filter").await?;
+        let name = PropertyParameter(
+            xml.prev_attr("name")
+                .ok_or(ParsingError::MissingAttribute)?,
+        );
+        let additional_rules = xml.maybe_find().await?;
+        xml.close().await?;
+        Ok(Self {
+            name,
+            additional_rules,
+        })
+    }
+}
+
+impl QRead<TimeOrText> for TimeOrText {
+    async fn qread(xml: &mut Reader<impl IRead>) -> Result<Self, ParsingError> {
+        match TimeRange::qread(xml).await {
+            Err(ParsingError::Recoverable) => (),
+            otherwise => return otherwise.map(Self::Time),
+        }
+        TextMatch::qread(xml).await.map(Self::Text)
+    }
+}
+
+impl QRead<TextMatch> for TextMatch {
+    async fn qread(xml: &mut Reader<impl IRead>) -> Result<Self, ParsingError> {
+        xml.open(CAL_URN, "text-match").await?;
+        let collation = xml.prev_attr("collation").map(Collation::new);
+        let negate_condition = xml.prev_attr("negate-condition").map(|v| v == "yes");
+        let text = xml.tag_string().await?;
+        xml.close().await?;
+        Ok(Self {
+            collation,
+            negate_condition,
+            text,
+        })
+    }
+}
+
+impl QRead<ParamFilterMatch> for ParamFilterMatch {
+    async fn qread(xml: &mut Reader<impl IRead>) -> Result<Self, ParsingError> {
+        if xml.maybe_open(CAL_URN, "is-not-defined").await?.is_some() {
+            xml.close().await?;
+            return Ok(Self::IsNotDefined);
+        }
+        TextMatch::qread(xml).await.map(Self::Match)
+    }
+}
+
+impl QRead<TimeZone> for TimeZone {
+    async fn qread(xml: &mut Reader<impl IRead>) -> Result<Self, ParsingError> {
+        xml.open(CAL_URN, "timezone").await?;
+        let inner = xml.tag_string().await?;
+        xml.close().await?;
+        Ok(Self(inner))
+    }
+}
+
+impl QRead<Filter> for Filter {
+    async fn qread(xml: &mut Reader<impl IRead>) -> Result<Self, ParsingError> {
+        xml.open(CAL_URN, "filter").await?;
+        let comp_filter = xml.find().await?;
+        xml.close().await?;
+        Ok(Self(comp_filter))
+    }
+}
+
+impl QRead<TimeRange> for TimeRange {
+    async fn qread(xml: &mut Reader<impl IRead>) -> Result<Self, ParsingError> {
+        xml.open(CAL_URN, "time-range").await?;
+
+        let start = match xml.prev_attr("start") {
+            Some(r) => Some(NaiveDateTime::parse_from_str(r.as_str(), UTC_DATETIME_FMT)?.and_utc()),
+            _ => None,
+        };
+        let end = match xml.prev_attr("end") {
+            Some(r) => Some(NaiveDateTime::parse_from_str(r.as_str(), UTC_DATETIME_FMT)?.and_utc()),
+            _ => None,
+        };
+
+        xml.close().await?;
+
+        match (start, end) {
+            (Some(start), Some(end)) => {
+                if start > end {
+                    return Err(ParsingError::InvalidValue);
+                }
+                Ok(TimeRange::FullRange(start, end))
+            }
+            (Some(start), None) => Ok(TimeRange::OnlyStart(start)),
+            (None, Some(end)) => Ok(TimeRange::OnlyEnd(end)),
+            (None, None) => Err(ParsingError::MissingAttribute),
+        }
+    }
+}
+
+impl QRead<CalProp> for CalProp {
+    async fn qread(xml: &mut Reader<impl IRead>) -> Result<Self, ParsingError> {
+        xml.open(CAL_URN, "prop").await?;
+        let name = ComponentProperty(
+            xml.prev_attr("name")
+                .ok_or(ParsingError::MissingAttribute)?,
+        );
+        let novalue = xml.prev_attr("novalue").map(|v| v == "yes");
+        xml.close().await?;
+        Ok(Self { name, novalue })
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::realization::Calendar;
+    use crate::xml::Node;
+    use chrono::{TimeZone, Utc};
+    //use quick_reader::NsReader;
+
+    async fn deserialize<T: Node<T>>(src: &str) -> T {
+        let mut rdr = Reader::new(quick_xml::NsReader::from_reader(src.as_bytes()))
+            .await
+            .unwrap();
+        rdr.find().await.unwrap()
+    }
+
+    #[tokio::test]
+    async fn simple_comp_filter() {
+        let expected = CompFilter {
+            name: Component::VEvent,
+            additional_rules: None,
+        };
+        let src = r#"<C:comp-filter name="VEVENT" xmlns:C="urn:ietf:params:xml:ns:caldav" />"#;
+        let got = deserialize::<CompFilter>(src).await;
+        assert_eq!(got, expected);
+    }
+
+    #[tokio::test]
+    async fn basic_mkcalendar() {
+        let expected = MkCalendar(dav::Set(dav::PropValue(vec![dav::Property::DisplayName(
+            "Lisa's Events".into(),
+        )])));
+
+        let src = r#"
+<?xml version="1.0" encoding="utf-8" ?>
+<C:mkcalendar xmlns:D="DAV:"
+             xmlns:C="urn:ietf:params:xml:ns:caldav">
+  <D:set>
+    <D:prop>
+      <D:displayname>Lisa's Events</D:displayname>
+    </D:prop>
+   </D:set>
+ </C:mkcalendar>
+"#;
+        let got = deserialize::<MkCalendar<Calendar>>(src).await;
+        assert_eq!(got, expected)
+    }
+
+    #[tokio::test]
+    async fn rfc_mkcalendar() {
+        let expected = MkCalendar(dav::Set(dav::PropValue(vec![
+            dav::Property::DisplayName("Lisa's Events".into()),
+            dav::Property::Extension(Property::CalendarDescription {
+                lang: Some("en".into()),
+                text: "Calendar restricted to events.".into(),
+            }),
+            dav::Property::Extension(Property::SupportedCalendarComponentSet(vec![
+                CompSupport(Component::VEvent)
+            ])),
+            dav::Property::Extension(Property::CalendarTimezone("BEGIN:VCALENDAR\nPRODID:-//Example Corp.//CalDAV Client//EN\nVERSION:2.0\nEND:VCALENDAR".into())),
+        ])));
+
+        let src = r#"
+   <?xml version="1.0" encoding="utf-8" ?>
+   <C:mkcalendar xmlns:D="DAV:"
+                 xmlns:C="urn:ietf:params:xml:ns:caldav">
+     <D:set>
+       <D:prop>
+         <D:displayname>Lisa's Events</D:displayname>
+         <C:calendar-description xml:lang="en"
+   >Calendar restricted to events.</C:calendar-description>
+         <C:supported-calendar-component-set>
+           <C:comp name="VEVENT"/>
+         </C:supported-calendar-component-set>
+         <C:calendar-timezone><![CDATA[BEGIN:VCALENDAR
+PRODID:-//Example Corp.//CalDAV Client//EN
+VERSION:2.0
+END:VCALENDAR]]></C:calendar-timezone>
+       </D:prop>
+     </D:set>
+   </C:mkcalendar>"#;
+
+        let got = deserialize::<MkCalendar<Calendar>>(src).await;
+        assert_eq!(got, expected)
+    }
+
+    #[tokio::test]
+    async fn rfc_calendar_query() {
+        let expected = CalendarQuery {
+            selector: Some(CalendarSelector::Prop(dav::PropName(vec![
+                dav::PropertyRequest::GetEtag,
+                dav::PropertyRequest::Extension(PropertyRequest::CalendarData(
+                    CalendarDataRequest {
+                        mime: None,
+                        comp: Some(Comp {
+                            name: Component::VCalendar,
+                            prop_kind: Some(PropKind::Prop(vec![CalProp {
+                                name: ComponentProperty("VERSION".into()),
+                                novalue: None,
+                            }])),
+                            comp_kind: Some(CompKind::Comp(vec![
+                                Comp {
+                                    name: Component::VEvent,
+                                    prop_kind: Some(PropKind::Prop(vec![
+                                        CalProp {
+                                            name: ComponentProperty("SUMMARY".into()),
+                                            novalue: None,
+                                        },
+                                        CalProp {
+                                            name: ComponentProperty("UID".into()),
+                                            novalue: None,
+                                        },
+                                        CalProp {
+                                            name: ComponentProperty("DTSTART".into()),
+                                            novalue: None,
+                                        },
+                                        CalProp {
+                                            name: ComponentProperty("DTEND".into()),
+                                            novalue: None,
+                                        },
+                                        CalProp {
+                                            name: ComponentProperty("DURATION".into()),
+                                            novalue: None,
+                                        },
+                                        CalProp {
+                                            name: ComponentProperty("RRULE".into()),
+                                            novalue: None,
+                                        },
+                                        CalProp {
+                                            name: ComponentProperty("RDATE".into()),
+                                            novalue: None,
+                                        },
+                                        CalProp {
+                                            name: ComponentProperty("EXRULE".into()),
+                                            novalue: None,
+                                        },
+                                        CalProp {
+                                            name: ComponentProperty("EXDATE".into()),
+                                            novalue: None,
+                                        },
+                                        CalProp {
+                                            name: ComponentProperty("RECURRENCE-ID".into()),
+                                            novalue: None,
+                                        },
+                                    ])),
+                                    comp_kind: None,
+                                },
+                                Comp {
+                                    name: Component::VTimeZone,
+                                    prop_kind: None,
+                                    comp_kind: None,
+                                },
+                            ])),
+                        }),
+                        recurrence: None,
+                        limit_freebusy_set: None,
+                    },
+                )),
+            ]))),
+            filter: Filter(CompFilter {
+                name: Component::VCalendar,
+                additional_rules: Some(CompFilterRules::Matches(CompFilterMatch {
+                    prop_filter: vec![],
+                    comp_filter: vec![CompFilter {
+                        name: Component::VEvent,
+                        additional_rules: Some(CompFilterRules::Matches(CompFilterMatch {
+                            prop_filter: vec![],
+                            comp_filter: vec![],
+                            time_range: Some(TimeRange::FullRange(
+                                Utc.with_ymd_and_hms(2006, 1, 4, 0, 0, 0).unwrap(),
+                                Utc.with_ymd_and_hms(2006, 1, 5, 0, 0, 0).unwrap(),
+                            )),
+                        })),
+                    }],
+                    time_range: None,
+                })),
+            }),
+            timezone: None,
+        };
+
+        let src = r#"
+<?xml version="1.0" encoding="utf-8" ?>
+<C:calendar-query xmlns:D="DAV:"
+             xmlns:C="urn:ietf:params:xml:ns:caldav">
+ <D:prop>
+   <D:getetag/>
+   <C:calendar-data>
+     <C:comp name="VCALENDAR">
+       <C:prop name="VERSION"/>
+       <C:comp name="VEVENT">
+         <C:prop name="SUMMARY"/>
+         <C:prop name="UID"/>
+         <C:prop name="DTSTART"/>
+         <C:prop name="DTEND"/>
+         <C:prop name="DURATION"/>
+         <C:prop name="RRULE"/>
+         <C:prop name="RDATE"/>
+         <C:prop name="EXRULE"/>
+         <C:prop name="EXDATE"/>
+         <C:prop name="RECURRENCE-ID"/>
+       </C:comp>
+       <C:comp name="VTIMEZONE"/>
+     </C:comp>
+   </C:calendar-data>
+ </D:prop>
+ <C:filter>
+   <C:comp-filter name="VCALENDAR">
+     <C:comp-filter name="VEVENT">
+       <C:time-range start="20060104T000000Z"
+                     end="20060105T000000Z"/>
+     </C:comp-filter>
+   </C:comp-filter>
+ </C:filter>
+</C:calendar-query>
+"#;
+
+        let got = deserialize::<CalendarQuery<Calendar>>(src).await;
+        assert_eq!(got, expected)
+    }
+
+    #[tokio::test]
+    async fn rfc_calendar_query_res() {
+        let expected = dav::Multistatus::<Calendar> {
+            extension: None,
+            responses: vec![
+                dav::Response {
+                    status_or_propstat: dav::StatusOrPropstat::PropStat(
+                        dav::Href("http://cal.example.com/bernard/work/abcd2.ics".into()),
+                        vec![dav::PropStat {
+                            prop: dav::AnyProp(vec![
+                                dav::AnyProperty::Value(dav::Property::GetEtag(
+                                    "\"fffff-abcd2\"".into(),
+                                )),
+                                dav::AnyProperty::Value(dav::Property::Extension(
+                                    Property::CalendarData(CalendarDataPayload {
+                                        mime: None,
+                                        payload: "BEGIN:VCALENDAR".into(),
+                                    }),
+                                )),
+                            ]),
+                            status: dav::Status(http::status::StatusCode::OK),
+                            error: None,
+                            responsedescription: None,
+                        }],
+                    ),
+                    error: None,
+                    location: None,
+                    responsedescription: None,
+                },
+                dav::Response {
+                    status_or_propstat: dav::StatusOrPropstat::PropStat(
+                        dav::Href("http://cal.example.com/bernard/work/abcd3.ics".into()),
+                        vec![dav::PropStat {
+                            prop: dav::AnyProp(vec![
+                                dav::AnyProperty::Value(dav::Property::GetEtag(
+                                    "\"fffff-abcd3\"".into(),
+                                )),
+                                dav::AnyProperty::Value(dav::Property::Extension(
+                                    Property::CalendarData(CalendarDataPayload {
+                                        mime: None,
+                                        payload: "BEGIN:VCALENDAR".into(),
+                                    }),
+                                )),
+                            ]),
+                            status: dav::Status(http::status::StatusCode::OK),
+                            error: None,
+                            responsedescription: None,
+                        }],
+                    ),
+                    error: None,
+                    location: None,
+                    responsedescription: None,
+                },
+            ],
+            responsedescription: None,
+        };
+
+        let src = r#"<D:multistatus xmlns:D="DAV:"
+              xmlns:C="urn:ietf:params:xml:ns:caldav">
+  <D:response>
+    <D:href>http://cal.example.com/bernard/work/abcd2.ics</D:href>
+       <D:propstat>
+         <D:prop>
+           <D:getetag>"fffff-abcd2"</D:getetag>
+           <C:calendar-data>BEGIN:VCALENDAR</C:calendar-data>
+         </D:prop>
+         <D:status>HTTP/1.1 200 OK</D:status>
+       </D:propstat>
+     </D:response>
+     <D:response>
+       <D:href>http://cal.example.com/bernard/work/abcd3.ics</D:href>
+       <D:propstat>
+         <D:prop>
+           <D:getetag>"fffff-abcd3"</D:getetag>
+           <C:calendar-data>BEGIN:VCALENDAR</C:calendar-data>
+         </D:prop>
+         <D:status>HTTP/1.1 200 OK</D:status>
+       </D:propstat>
+     </D:response>
+   </D:multistatus>
+"#;
+
+        let got = deserialize::<dav::Multistatus<Calendar>>(src).await;
+        assert_eq!(got, expected)
+    }
+
+    #[tokio::test]
+    async fn rfc_recurring_evt() {
+        let expected = CalendarQuery::<Calendar> {
+            selector: Some(CalendarSelector::Prop(dav::PropName(vec![
+                dav::PropertyRequest::Extension(PropertyRequest::CalendarData(
+                    CalendarDataRequest {
+                        mime: None,
+                        comp: None,
+                        recurrence: Some(RecurrenceModifier::LimitRecurrenceSet(
+                            LimitRecurrenceSet(
+                                Utc.with_ymd_and_hms(2006, 1, 3, 0, 0, 0).unwrap(),
+                                Utc.with_ymd_and_hms(2006, 1, 5, 0, 0, 0).unwrap(),
+                            ),
+                        )),
+                        limit_freebusy_set: None,
+                    },
+                )),
+            ]))),
+            filter: Filter(CompFilter {
+                name: Component::VCalendar,
+                additional_rules: Some(CompFilterRules::Matches(CompFilterMatch {
+                    prop_filter: vec![],
+                    comp_filter: vec![CompFilter {
+                        name: Component::VEvent,
+                        additional_rules: Some(CompFilterRules::Matches(CompFilterMatch {
+                            prop_filter: vec![],
+                            comp_filter: vec![],
+                            time_range: Some(TimeRange::FullRange(
+                                Utc.with_ymd_and_hms(2006, 1, 3, 0, 0, 0).unwrap(),
+                                Utc.with_ymd_and_hms(2006, 1, 5, 0, 0, 0).unwrap(),
+                            )),
+                        })),
+                    }],
+                    time_range: None,
+                })),
+            }),
+            timezone: None,
+        };
+
+        let src = r#"
+  <?xml version="1.0" encoding="utf-8" ?>
+   <C:calendar-query xmlns:D="DAV:"
+                     xmlns:C="urn:ietf:params:xml:ns:caldav">
+     <D:prop>
+       <C:calendar-data>
+         <C:limit-recurrence-set start="20060103T000000Z"
+                                 end="20060105T000000Z"/>
+       </C:calendar-data>
+     </D:prop>
+     <C:filter>
+       <C:comp-filter name="VCALENDAR">
+         <C:comp-filter name="VEVENT">
+           <C:time-range start="20060103T000000Z"
+                         end="20060105T000000Z"/>
+         </C:comp-filter>
+       </C:comp-filter>
+     </C:filter>
+   </C:calendar-query>"#;
+
+        let got = deserialize::<CalendarQuery<Calendar>>(src).await;
+        assert_eq!(got, expected)
+    }
+
+    #[tokio::test]
+    async fn rfc_pending_todos() {
+        let expected = CalendarQuery::<Calendar> {
+            selector: Some(CalendarSelector::Prop(dav::PropName(vec![
+                dav::PropertyRequest::GetEtag,
+                dav::PropertyRequest::Extension(PropertyRequest::CalendarData(
+                    CalendarDataRequest {
+                        mime: None,
+                        comp: None,
+                        recurrence: None,
+                        limit_freebusy_set: None,
+                    },
+                )),
+            ]))),
+            filter: Filter(CompFilter {
+                name: Component::VCalendar,
+                additional_rules: Some(CompFilterRules::Matches(CompFilterMatch {
+                    time_range: None,
+                    prop_filter: vec![],
+                    comp_filter: vec![CompFilter {
+                        name: Component::VTodo,
+                        additional_rules: Some(CompFilterRules::Matches(CompFilterMatch {
+                            time_range: None,
+                            comp_filter: vec![],
+                            prop_filter: vec![
+                                PropFilter {
+                                    name: ComponentProperty("COMPLETED".into()),
+                                    additional_rules: Some(PropFilterRules::IsNotDefined),
+                                },
+                                PropFilter {
+                                    name: ComponentProperty("STATUS".into()),
+                                    additional_rules: Some(PropFilterRules::Match(
+                                        PropFilterMatch {
+                                            param_filter: vec![],
+                                            time_or_text: Some(TimeOrText::Text(TextMatch {
+                                                collation: None,
+                                                negate_condition: Some(true),
+                                                text: "CANCELLED".into(),
+                                            })),
+                                        },
+                                    )),
+                                },
+                            ],
+                        })),
+                    }],
+                })),
+            }),
+            timezone: None,
+        };
+
+        let src = r#"<?xml version="1.0" encoding="utf-8" ?>
+   <C:calendar-query xmlns:C="urn:ietf:params:xml:ns:caldav">
+     <D:prop xmlns:D="DAV:">
+       <D:getetag/>
+       <C:calendar-data/>
+     </D:prop>
+     <C:filter>
+       <C:comp-filter name="VCALENDAR">
+         <C:comp-filter name="VTODO">
+           <C:prop-filter name="COMPLETED">
+             <C:is-not-defined/>
+           </C:prop-filter>
+           <C:prop-filter name="STATUS">
+             <C:text-match
+                negate-condition="yes">CANCELLED</C:text-match>
+           </C:prop-filter>
+         </C:comp-filter>
+       </C:comp-filter>
+     </C:filter>
+   </C:calendar-query>"#;
+
+        let got = deserialize::<CalendarQuery<Calendar>>(src).await;
+        assert_eq!(got, expected)
+    }
+}
diff --git a/aero-dav/src/calencoder.rs b/aero-dav/src/calencoder.rs
new file mode 100644
index 0000000..15df965
--- /dev/null
+++ b/aero-dav/src/calencoder.rs
@@ -0,0 +1,1036 @@
+use quick_xml::events::{BytesText, Event};
+use quick_xml::Error as QError;
+
+use super::caltypes::*;
+use super::types::Extension;
+use super::xml::{IWrite, Node, QWrite, Writer};
+
+// ==================== Calendar Types Serialization =========================
+
+// -------------------- MKCALENDAR METHOD ------------------------------------
+impl<E: Extension> QWrite for MkCalendar<E> {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        let start = xml.create_cal_element("mkcalendar");
+        let end = start.to_end();
+
+        xml.q.write_event_async(Event::Start(start.clone())).await?;
+        self.0.qwrite(xml).await?;
+        xml.q.write_event_async(Event::End(end)).await
+    }
+}
+
+impl<E: Extension> QWrite for MkCalendarResponse<E> {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        let start = xml.create_cal_element("mkcalendar-response");
+        let end = start.to_end();
+
+        xml.q.write_event_async(Event::Start(start.clone())).await?;
+        for propstat in self.0.iter() {
+            propstat.qwrite(xml).await?;
+        }
+        xml.q.write_event_async(Event::End(end)).await
+    }
+}
+
+// ----------------------- REPORT METHOD -------------------------------------
+impl QWrite for ReportTypeName {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        match self {
+            Self::Query => {
+                let start = xml.create_dav_element("calendar-query");
+                xml.q.write_event_async(Event::Empty(start)).await
+            }
+            Self::Multiget => {
+                let start = xml.create_dav_element("calendar-multiget");
+                xml.q.write_event_async(Event::Empty(start)).await
+            }
+            Self::FreeBusy => {
+                let start = xml.create_dav_element("free-busy-query");
+                xml.q.write_event_async(Event::Empty(start)).await
+            }
+        }
+    }
+}
+
+impl<E: Extension> QWrite for ReportType<E> {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        match self {
+            Self::Query(v) => v.qwrite(xml).await,
+            Self::Multiget(v) => v.qwrite(xml).await,
+            Self::FreeBusy(v) => v.qwrite(xml).await,
+        }
+    }
+}
+
+impl<E: Extension> QWrite for CalendarQuery<E> {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        let start = xml.create_cal_element("calendar-query");
+        let end = start.to_end();
+
+        xml.q.write_event_async(Event::Start(start.clone())).await?;
+        if let Some(selector) = &self.selector {
+            selector.qwrite(xml).await?;
+        }
+        self.filter.qwrite(xml).await?;
+        if let Some(tz) = &self.timezone {
+            tz.qwrite(xml).await?;
+        }
+        xml.q.write_event_async(Event::End(end)).await
+    }
+}
+
+impl<E: Extension> QWrite for CalendarMultiget<E> {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        let start = xml.create_cal_element("calendar-multiget");
+        let end = start.to_end();
+
+        xml.q.write_event_async(Event::Start(start.clone())).await?;
+        if let Some(selector) = &self.selector {
+            selector.qwrite(xml).await?;
+        }
+        for href in self.href.iter() {
+            href.qwrite(xml).await?;
+        }
+        xml.q.write_event_async(Event::End(end)).await
+    }
+}
+
+impl QWrite for FreeBusyQuery {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        let start = xml.create_cal_element("free-busy-query");
+        let end = start.to_end();
+
+        xml.q.write_event_async(Event::Start(start.clone())).await?;
+        self.0.qwrite(xml).await?;
+        xml.q.write_event_async(Event::End(end)).await
+    }
+}
+
+// -------------------------- DAV::prop --------------------------------------
+impl QWrite for PropertyRequest {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        let mut atom = async |c| {
+            let empty_tag = xml.create_cal_element(c);
+            xml.q.write_event_async(Event::Empty(empty_tag)).await
+        };
+
+        match self {
+            Self::CalendarHomeSet => atom("calendar-home-set").await,
+            Self::CalendarDescription => atom("calendar-description").await,
+            Self::CalendarTimezone => atom("calendar-timezone").await,
+            Self::SupportedCalendarComponentSet => atom("supported-calendar-component-set").await,
+            Self::SupportedCalendarData => atom("supported-calendar-data").await,
+            Self::MaxResourceSize => atom("max-resource-size").await,
+            Self::MinDateTime => atom("min-date-time").await,
+            Self::MaxDateTime => atom("max-date-time").await,
+            Self::MaxInstances => atom("max-instances").await,
+            Self::MaxAttendeesPerInstance => atom("max-attendees-per-instance").await,
+            Self::SupportedCollationSet => atom("supported-collation-set").await,
+            Self::CalendarData(req) => req.qwrite(xml).await,
+        }
+    }
+}
+impl QWrite for Property {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        match self {
+            Self::CalendarHomeSet(href) => {
+                let start = xml.create_cal_element("calendar-home-set");
+                let end = start.to_end();
+                xml.q.write_event_async(Event::Start(start.clone())).await?;
+                href.qwrite(xml).await?;
+                xml.q.write_event_async(Event::End(end)).await
+            }
+            Self::CalendarDescription { lang, text } => {
+                let mut start = xml.create_cal_element("calendar-description");
+                if let Some(the_lang) = lang {
+                    start.push_attribute(("xml:lang", the_lang.as_str()));
+                }
+                let end = start.to_end();
+
+                xml.q.write_event_async(Event::Start(start.clone())).await?;
+                xml.q
+                    .write_event_async(Event::Text(BytesText::new(text)))
+                    .await?;
+                xml.q.write_event_async(Event::End(end)).await
+            }
+            Self::CalendarTimezone(payload) => {
+                let start = xml.create_cal_element("calendar-timezone");
+                let end = start.to_end();
+
+                xml.q.write_event_async(Event::Start(start.clone())).await?;
+                xml.q
+                    .write_event_async(Event::Text(BytesText::new(payload)))
+                    .await?;
+                xml.q.write_event_async(Event::End(end)).await
+            }
+            Self::SupportedCalendarComponentSet(many_comp) => {
+                let start = xml.create_cal_element("supported-calendar-component-set");
+                let end = start.to_end();
+
+                xml.q.write_event_async(Event::Start(start.clone())).await?;
+                for comp in many_comp.iter() {
+                    comp.qwrite(xml).await?;
+                }
+                xml.q.write_event_async(Event::End(end)).await
+            }
+            Self::SupportedCalendarData(many_mime) => {
+                let start = xml.create_cal_element("supported-calendar-data");
+                let end = start.to_end();
+
+                xml.q.write_event_async(Event::Start(start.clone())).await?;
+                for mime in many_mime.iter() {
+                    mime.qwrite(xml).await?;
+                }
+                xml.q.write_event_async(Event::End(end)).await
+            }
+            Self::MaxResourceSize(bytes) => {
+                let start = xml.create_cal_element("max-resource-size");
+                let end = start.to_end();
+
+                xml.q.write_event_async(Event::Start(start.clone())).await?;
+                xml.q
+                    .write_event_async(Event::Text(BytesText::new(bytes.to_string().as_str())))
+                    .await?;
+                xml.q.write_event_async(Event::End(end)).await
+            }
+            Self::MinDateTime(dt) => {
+                let start = xml.create_cal_element("min-date-time");
+                let end = start.to_end();
+
+                let dtstr = format!("{}", dt.format(UTC_DATETIME_FMT));
+                xml.q.write_event_async(Event::Start(start.clone())).await?;
+                xml.q
+                    .write_event_async(Event::Text(BytesText::new(dtstr.as_str())))
+                    .await?;
+                xml.q.write_event_async(Event::End(end)).await
+            }
+            Self::MaxDateTime(dt) => {
+                let start = xml.create_cal_element("max-date-time");
+                let end = start.to_end();
+
+                let dtstr = format!("{}", dt.format(UTC_DATETIME_FMT));
+                xml.q.write_event_async(Event::Start(start.clone())).await?;
+                xml.q
+                    .write_event_async(Event::Text(BytesText::new(dtstr.as_str())))
+                    .await?;
+                xml.q.write_event_async(Event::End(end)).await
+            }
+            Self::MaxInstances(count) => {
+                let start = xml.create_cal_element("max-instances");
+                let end = start.to_end();
+
+                xml.q.write_event_async(Event::Start(start.clone())).await?;
+                xml.q
+                    .write_event_async(Event::Text(BytesText::new(count.to_string().as_str())))
+                    .await?;
+                xml.q.write_event_async(Event::End(end)).await
+            }
+            Self::MaxAttendeesPerInstance(count) => {
+                let start = xml.create_cal_element("max-attendees-per-instance");
+                let end = start.to_end();
+
+                xml.q.write_event_async(Event::Start(start.clone())).await?;
+                xml.q
+                    .write_event_async(Event::Text(BytesText::new(count.to_string().as_str())))
+                    .await?;
+                xml.q.write_event_async(Event::End(end)).await
+            }
+            Self::SupportedCollationSet(many_collations) => {
+                let start = xml.create_cal_element("supported-collation-set");
+                let end = start.to_end();
+
+                xml.q.write_event_async(Event::Start(start.clone())).await?;
+                for collation in many_collations.iter() {
+                    collation.qwrite(xml).await?;
+                }
+                xml.q.write_event_async(Event::End(end)).await
+            }
+            Self::CalendarData(inner) => inner.qwrite(xml).await,
+        }
+    }
+}
+
+// ---------------------- DAV::resourcetype ----------------------------------
+impl QWrite for ResourceType {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        match self {
+            Self::Calendar => {
+                let empty_tag = xml.create_cal_element("calendar");
+                xml.q.write_event_async(Event::Empty(empty_tag)).await
+            }
+        }
+    }
+}
+
+// --------------------------- DAV::error ------------------------------------
+impl QWrite for Violation {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        let mut atom = async |c| {
+            let empty_tag = xml.create_cal_element(c);
+            xml.q.write_event_async(Event::Empty(empty_tag)).await
+        };
+
+        match self {
+            //@FIXME
+            // DAV elements, should not be here but in RFC3744 on ACLs
+            // (we do not use atom as this error is in the DAV namespace, not the caldav one)
+            Self::NeedPrivileges => {
+                let empty_tag = xml.create_dav_element("need-privileges");
+                xml.q.write_event_async(Event::Empty(empty_tag)).await
+            }
+
+            // Regular CalDAV errors
+            Self::ResourceMustBeNull => atom("resource-must-be-null").await,
+            Self::CalendarCollectionLocationOk => atom("calendar-collection-location-ok").await,
+            Self::ValidCalendarData => atom("valid-calendar-data").await,
+            Self::InitializeCalendarCollection => atom("initialize-calendar-collection").await,
+            Self::SupportedCalendarData => atom("supported-calendar-data").await,
+            Self::ValidCalendarObjectResource => atom("valid-calendar-object-resource").await,
+            Self::SupportedCalendarComponent => atom("supported-calendar-component").await,
+            Self::NoUidConflict(href) => {
+                let start = xml.create_cal_element("no-uid-conflict");
+                let end = start.to_end();
+
+                xml.q.write_event_async(Event::Start(start.clone())).await?;
+                href.qwrite(xml).await?;
+                xml.q.write_event_async(Event::End(end)).await
+            }
+            Self::MaxResourceSize => atom("max-resource-size").await,
+            Self::MinDateTime => atom("min-date-time").await,
+            Self::MaxDateTime => atom("max-date-time").await,
+            Self::MaxInstances => atom("max-instances").await,
+            Self::MaxAttendeesPerInstance => atom("max-attendees-per-instance").await,
+            Self::ValidFilter => atom("valid-filter").await,
+            Self::SupportedFilter { comp, prop, param } => {
+                let start = xml.create_cal_element("supported-filter");
+                let end = start.to_end();
+
+                xml.q.write_event_async(Event::Start(start.clone())).await?;
+                for comp_item in comp.iter() {
+                    comp_item.qwrite(xml).await?;
+                }
+                for prop_item in prop.iter() {
+                    prop_item.qwrite(xml).await?;
+                }
+                for param_item in param.iter() {
+                    param_item.qwrite(xml).await?;
+                }
+                xml.q.write_event_async(Event::End(end)).await
+            }
+            Self::NumberOfMatchesWithinLimits => atom("number-of-matches-within-limits").await,
+        }
+    }
+}
+
+// ---------------------------- Inner XML ------------------------------------
+impl QWrite for SupportedCollation {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        let start = xml.create_cal_element("supported-collation");
+        let end = start.to_end();
+
+        xml.q.write_event_async(Event::Start(start.clone())).await?;
+        self.0.qwrite(xml).await?;
+        xml.q.write_event_async(Event::End(end)).await
+    }
+}
+
+impl QWrite for Collation {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        let col = match self {
+            Self::AsciiCaseMap => "i;ascii-casemap",
+            Self::Octet => "i;octet",
+            Self::Unknown(v) => v.as_str(),
+        };
+
+        xml.q
+            .write_event_async(Event::Text(BytesText::new(col)))
+            .await
+    }
+}
+
+impl QWrite for CalendarDataSupport {
+    async fn qwrite(&self, _xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        unreachable!();
+    }
+}
+
+impl QWrite for CalendarDataPayload {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        let mut start = xml.create_cal_element("calendar-data");
+        if let Some(mime) = &self.mime {
+            start.push_attribute(("content-type", mime.content_type.as_str()));
+            start.push_attribute(("version", mime.version.as_str()));
+        }
+        let end = start.to_end();
+
+        xml.q.write_event_async(Event::Start(start.clone())).await?;
+        xml.q
+            .write_event_async(Event::Text(BytesText::new(self.payload.as_str())))
+            .await?;
+        xml.q.write_event_async(Event::End(end)).await
+    }
+}
+
+impl QWrite for CalendarDataRequest {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        let mut start = xml.create_cal_element("calendar-data");
+        if let Some(mime) = &self.mime {
+            start.push_attribute(("content-type", mime.content_type.as_str()));
+            start.push_attribute(("version", mime.version.as_str()));
+        }
+
+        // Empty tag
+        if self.comp.is_none() && self.recurrence.is_none() && self.limit_freebusy_set.is_none() {
+            return xml.q.write_event_async(Event::Empty(start.clone())).await;
+        }
+
+        let end = start.to_end();
+        xml.q.write_event_async(Event::Start(start.clone())).await?;
+        if let Some(comp) = &self.comp {
+            comp.qwrite(xml).await?;
+        }
+        if let Some(recurrence) = &self.recurrence {
+            recurrence.qwrite(xml).await?;
+        }
+        if let Some(freebusy) = &self.limit_freebusy_set {
+            freebusy.qwrite(xml).await?;
+        }
+        xml.q.write_event_async(Event::End(end)).await
+    }
+}
+
+impl QWrite for CalendarDataEmpty {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        let mut empty = xml.create_cal_element("calendar-data");
+        if let Some(mime) = &self.0 {
+            empty.push_attribute(("content-type", mime.content_type.as_str()));
+            empty.push_attribute(("version", mime.version.as_str()));
+        }
+        xml.q.write_event_async(Event::Empty(empty)).await
+    }
+}
+
+impl QWrite for Comp {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        let mut start = xml.create_cal_element("comp");
+        start.push_attribute(("name", self.name.as_str()));
+        match (&self.prop_kind, &self.comp_kind) {
+            (None, None) => xml.q.write_event_async(Event::Empty(start)).await,
+            _ => {
+                let end = start.to_end();
+                xml.q.write_event_async(Event::Start(start.clone())).await?;
+                if let Some(prop_kind) = &self.prop_kind {
+                    prop_kind.qwrite(xml).await?;
+                }
+                if let Some(comp_kind) = &self.comp_kind {
+                    comp_kind.qwrite(xml).await?;
+                }
+                xml.q.write_event_async(Event::End(end)).await
+            }
+        }
+    }
+}
+
+impl QWrite for CompSupport {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        let mut empty = xml.create_cal_element("comp");
+        empty.push_attribute(("name", self.0.as_str()));
+        xml.q.write_event_async(Event::Empty(empty)).await
+    }
+}
+
+impl QWrite for CompKind {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        match self {
+            Self::AllComp => {
+                let empty_tag = xml.create_cal_element("allcomp");
+                xml.q.write_event_async(Event::Empty(empty_tag)).await
+            }
+            Self::Comp(many_comp) => {
+                for comp in many_comp.iter() {
+                    // Required: recursion in an async fn requires boxing
+                    // rustc --explain E0733
+                    // Cycle detected when computing type of ...
+                    // For more information about this error, try `rustc --explain E0391`.
+                    // https://github.com/rust-lang/rust/issues/78649
+                    #[inline(always)]
+                    fn recurse<'a>(
+                        comp: &'a Comp,
+                        xml: &'a mut Writer<impl IWrite>,
+                    ) -> futures::future::BoxFuture<'a, Result<(), QError>> {
+                        Box::pin(comp.qwrite(xml))
+                    }
+                    recurse(comp, xml).await?;
+                }
+                Ok(())
+            }
+        }
+    }
+}
+
+impl QWrite for PropKind {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        match self {
+            Self::AllProp => {
+                let empty_tag = xml.create_cal_element("allprop");
+                xml.q.write_event_async(Event::Empty(empty_tag)).await
+            }
+            Self::Prop(many_prop) => {
+                for prop in many_prop.iter() {
+                    prop.qwrite(xml).await?;
+                }
+                Ok(())
+            }
+        }
+    }
+}
+
+impl QWrite for CalProp {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        let mut empty = xml.create_cal_element("prop");
+        empty.push_attribute(("name", self.name.0.as_str()));
+        match self.novalue {
+            None => (),
+            Some(true) => empty.push_attribute(("novalue", "yes")),
+            Some(false) => empty.push_attribute(("novalue", "no")),
+        }
+        xml.q.write_event_async(Event::Empty(empty)).await
+    }
+}
+
+impl QWrite for RecurrenceModifier {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        match self {
+            Self::Expand(exp) => exp.qwrite(xml).await,
+            Self::LimitRecurrenceSet(lrs) => lrs.qwrite(xml).await,
+        }
+    }
+}
+
+impl QWrite for Expand {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        let mut empty = xml.create_cal_element("expand");
+        empty.push_attribute((
+            "start",
+            format!("{}", self.0.format(UTC_DATETIME_FMT)).as_str(),
+        ));
+        empty.push_attribute((
+            "end",
+            format!("{}", self.1.format(UTC_DATETIME_FMT)).as_str(),
+        ));
+        xml.q.write_event_async(Event::Empty(empty)).await
+    }
+}
+
+impl QWrite for LimitRecurrenceSet {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        let mut empty = xml.create_cal_element("limit-recurrence-set");
+        empty.push_attribute((
+            "start",
+            format!("{}", self.0.format(UTC_DATETIME_FMT)).as_str(),
+        ));
+        empty.push_attribute((
+            "end",
+            format!("{}", self.1.format(UTC_DATETIME_FMT)).as_str(),
+        ));
+        xml.q.write_event_async(Event::Empty(empty)).await
+    }
+}
+
+impl QWrite for LimitFreebusySet {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        let mut empty = xml.create_cal_element("limit-freebusy-set");
+        empty.push_attribute((
+            "start",
+            format!("{}", self.0.format(UTC_DATETIME_FMT)).as_str(),
+        ));
+        empty.push_attribute((
+            "end",
+            format!("{}", self.1.format(UTC_DATETIME_FMT)).as_str(),
+        ));
+        xml.q.write_event_async(Event::Empty(empty)).await
+    }
+}
+
+impl<E: Extension> QWrite for CalendarSelector<E> {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        match self {
+            Self::AllProp => {
+                let empty_tag = xml.create_dav_element("allprop");
+                xml.q.write_event_async(Event::Empty(empty_tag)).await
+            }
+            Self::PropName => {
+                let empty_tag = xml.create_dav_element("propname");
+                xml.q.write_event_async(Event::Empty(empty_tag)).await
+            }
+            Self::Prop(prop) => prop.qwrite(xml).await,
+        }
+    }
+}
+
+impl QWrite for CompFilter {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        let mut start = xml.create_cal_element("comp-filter");
+        start.push_attribute(("name", self.name.as_str()));
+
+        match &self.additional_rules {
+            None => xml.q.write_event_async(Event::Empty(start)).await,
+            Some(rules) => {
+                let end = start.to_end();
+
+                xml.q.write_event_async(Event::Start(start.clone())).await?;
+                rules.qwrite(xml).await?;
+                xml.q.write_event_async(Event::End(end)).await
+            }
+        }
+    }
+}
+
+impl QWrite for CompFilterRules {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        match self {
+            Self::IsNotDefined => {
+                let empty_tag = xml.create_dav_element("is-not-defined");
+                xml.q.write_event_async(Event::Empty(empty_tag)).await
+            }
+            Self::Matches(cfm) => cfm.qwrite(xml).await,
+        }
+    }
+}
+
+impl QWrite for CompFilterMatch {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        if let Some(time_range) = &self.time_range {
+            time_range.qwrite(xml).await?;
+        }
+
+        for prop_item in self.prop_filter.iter() {
+            prop_item.qwrite(xml).await?;
+        }
+        for comp_item in self.comp_filter.iter() {
+            // Required: recursion in an async fn requires boxing
+            // rustc --explain E0733
+            // Cycle detected when computing type of ...
+            // For more information about this error, try `rustc --explain E0391`.
+            // https://github.com/rust-lang/rust/issues/78649
+            #[inline(always)]
+            fn recurse<'a>(
+                comp: &'a CompFilter,
+                xml: &'a mut Writer<impl IWrite>,
+            ) -> futures::future::BoxFuture<'a, Result<(), QError>> {
+                Box::pin(comp.qwrite(xml))
+            }
+            recurse(comp_item, xml).await?;
+        }
+        Ok(())
+    }
+}
+
+impl QWrite for PropFilter {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        let mut start = xml.create_cal_element("prop-filter");
+        start.push_attribute(("name", self.name.0.as_str()));
+
+        match &self.additional_rules {
+            None => xml.q.write_event_async(Event::Empty(start.clone())).await,
+            Some(rules) => {
+                let end = start.to_end();
+                xml.q.write_event_async(Event::Start(start.clone())).await?;
+                rules.qwrite(xml).await?;
+                xml.q.write_event_async(Event::End(end)).await
+            }
+        }
+    }
+}
+
+impl QWrite for PropFilterRules {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        match self {
+            Self::IsNotDefined => {
+                let empty_tag = xml.create_dav_element("is-not-defined");
+                xml.q.write_event_async(Event::Empty(empty_tag)).await
+            }
+            Self::Match(prop_match) => prop_match.qwrite(xml).await,
+        }
+    }
+}
+
+impl QWrite for PropFilterMatch {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        if let Some(time_or_text) = &self.time_or_text {
+            time_or_text.qwrite(xml).await?;
+        }
+        for param_item in self.param_filter.iter() {
+            param_item.qwrite(xml).await?;
+        }
+        Ok(())
+    }
+}
+
+impl QWrite for TimeOrText {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        match self {
+            Self::Time(time) => time.qwrite(xml).await,
+            Self::Text(txt) => txt.qwrite(xml).await,
+        }
+    }
+}
+
+impl QWrite for TextMatch {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        let mut start = xml.create_cal_element("text-match");
+        if let Some(collation) = &self.collation {
+            start.push_attribute(("collation", collation.as_str()));
+        }
+        match self.negate_condition {
+            None => (),
+            Some(true) => start.push_attribute(("negate-condition", "yes")),
+            Some(false) => start.push_attribute(("negate-condition", "no")),
+        }
+        let end = start.to_end();
+
+        xml.q.write_event_async(Event::Start(start.clone())).await?;
+        xml.q
+            .write_event_async(Event::Text(BytesText::new(self.text.as_str())))
+            .await?;
+        xml.q.write_event_async(Event::End(end)).await
+    }
+}
+
+impl QWrite for ParamFilter {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        let mut start = xml.create_cal_element("param-filter");
+        start.push_attribute(("name", self.name.as_str()));
+
+        match &self.additional_rules {
+            None => xml.q.write_event_async(Event::Empty(start)).await,
+            Some(rules) => {
+                let end = start.to_end();
+                xml.q.write_event_async(Event::Start(start.clone())).await?;
+                rules.qwrite(xml).await?;
+                xml.q.write_event_async(Event::End(end)).await
+            }
+        }
+    }
+}
+
+impl QWrite for ParamFilterMatch {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        match self {
+            Self::IsNotDefined => {
+                let empty_tag = xml.create_dav_element("is-not-defined");
+                xml.q.write_event_async(Event::Empty(empty_tag)).await
+            }
+            Self::Match(tm) => tm.qwrite(xml).await,
+        }
+    }
+}
+
+impl QWrite for TimeZone {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        let start = xml.create_cal_element("timezone");
+        let end = start.to_end();
+
+        xml.q.write_event_async(Event::Start(start.clone())).await?;
+        xml.q
+            .write_event_async(Event::Text(BytesText::new(self.0.as_str())))
+            .await?;
+        xml.q.write_event_async(Event::End(end)).await
+    }
+}
+
+impl QWrite for Filter {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        let start = xml.create_cal_element("filter");
+        let end = start.to_end();
+
+        xml.q.write_event_async(Event::Start(start.clone())).await?;
+        self.0.qwrite(xml).await?;
+        xml.q.write_event_async(Event::End(end)).await
+    }
+}
+
+impl QWrite for TimeRange {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        let mut empty = xml.create_cal_element("time-range");
+        match self {
+            Self::OnlyStart(start) => empty.push_attribute((
+                "start",
+                format!("{}", start.format(UTC_DATETIME_FMT)).as_str(),
+            )),
+            Self::OnlyEnd(end) => {
+                empty.push_attribute(("end", format!("{}", end.format(UTC_DATETIME_FMT)).as_str()))
+            }
+            Self::FullRange(start, end) => {
+                empty.push_attribute((
+                    "start",
+                    format!("{}", start.format(UTC_DATETIME_FMT)).as_str(),
+                ));
+                empty.push_attribute(("end", format!("{}", end.format(UTC_DATETIME_FMT)).as_str()));
+            }
+        }
+        xml.q.write_event_async(Event::Empty(empty)).await
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::realization::Calendar;
+    use crate::types as dav;
+    use chrono::{TimeZone, Utc};
+    use tokio::io::AsyncWriteExt;
+
+    async fn serialize(elem: &impl QWrite) -> String {
+        let mut buffer = Vec::new();
+        let mut tokio_buffer = tokio::io::BufWriter::new(&mut buffer);
+        let q = quick_xml::writer::Writer::new_with_indent(&mut tokio_buffer, b' ', 4);
+        let ns_to_apply = vec![
+            ("xmlns:D".into(), "DAV:".into()),
+            ("xmlns:C".into(), "urn:ietf:params:xml:ns:caldav".into()),
+        ];
+        let mut writer = Writer { q, ns_to_apply };
+
+        elem.qwrite(&mut writer).await.expect("xml serialization");
+        tokio_buffer.flush().await.expect("tokio buffer flush");
+        let got = std::str::from_utf8(buffer.as_slice()).unwrap();
+
+        return got.into();
+    }
+
+    #[tokio::test]
+    async fn basic_violation() {
+        let got = serialize(&dav::Error::<Calendar>(vec![dav::Violation::Extension(
+            Violation::ResourceMustBeNull,
+        )]))
+        .await;
+
+        let expected = r#"<D:error xmlns:D="DAV:" xmlns:C="urn:ietf:params:xml:ns:caldav">
+    <C:resource-must-be-null/>
+</D:error>"#;
+
+        assert_eq!(
+            &got, expected,
+            "\n---GOT---\n{got}\n---EXP---\n{expected}\n"
+        );
+    }
+
+    #[tokio::test]
+    async fn rfc_calendar_query1_req() {
+        let got = serialize(&CalendarQuery::<Calendar> {
+            selector: Some(CalendarSelector::Prop(dav::PropName(vec![
+                dav::PropertyRequest::GetEtag,
+                dav::PropertyRequest::Extension(PropertyRequest::CalendarData(
+                    CalendarDataRequest {
+                        mime: None,
+                        comp: Some(Comp {
+                            name: Component::VCalendar,
+                            prop_kind: Some(PropKind::Prop(vec![CalProp {
+                                name: ComponentProperty("VERSION".into()),
+                                novalue: None,
+                            }])),
+                            comp_kind: Some(CompKind::Comp(vec![
+                                Comp {
+                                    name: Component::VEvent,
+                                    prop_kind: Some(PropKind::Prop(vec![
+                                        CalProp {
+                                            name: ComponentProperty("SUMMARY".into()),
+                                            novalue: None,
+                                        },
+                                        CalProp {
+                                            name: ComponentProperty("UID".into()),
+                                            novalue: None,
+                                        },
+                                        CalProp {
+                                            name: ComponentProperty("DTSTART".into()),
+                                            novalue: None,
+                                        },
+                                        CalProp {
+                                            name: ComponentProperty("DTEND".into()),
+                                            novalue: None,
+                                        },
+                                        CalProp {
+                                            name: ComponentProperty("DURATION".into()),
+                                            novalue: None,
+                                        },
+                                        CalProp {
+                                            name: ComponentProperty("RRULE".into()),
+                                            novalue: None,
+                                        },
+                                        CalProp {
+                                            name: ComponentProperty("RDATE".into()),
+                                            novalue: None,
+                                        },
+                                        CalProp {
+                                            name: ComponentProperty("EXRULE".into()),
+                                            novalue: None,
+                                        },
+                                        CalProp {
+                                            name: ComponentProperty("EXDATE".into()),
+                                            novalue: None,
+                                        },
+                                        CalProp {
+                                            name: ComponentProperty("RECURRENCE-ID".into()),
+                                            novalue: None,
+                                        },
+                                    ])),
+                                    comp_kind: None,
+                                },
+                                Comp {
+                                    name: Component::VTimeZone,
+                                    prop_kind: None,
+                                    comp_kind: None,
+                                },
+                            ])),
+                        }),
+                        recurrence: None,
+                        limit_freebusy_set: None,
+                    },
+                )),
+            ]))),
+            filter: Filter(CompFilter {
+                name: Component::VCalendar,
+                additional_rules: Some(CompFilterRules::Matches(CompFilterMatch {
+                    time_range: None,
+                    prop_filter: vec![],
+                    comp_filter: vec![CompFilter {
+                        name: Component::VEvent,
+                        additional_rules: Some(CompFilterRules::Matches(CompFilterMatch {
+                            time_range: Some(TimeRange::FullRange(
+                                Utc.with_ymd_and_hms(2006, 1, 4, 0, 0, 0).unwrap(),
+                                Utc.with_ymd_and_hms(2006, 1, 5, 0, 0, 0).unwrap(),
+                            )),
+                            prop_filter: vec![],
+                            comp_filter: vec![],
+                        })),
+                    }],
+                })),
+            }),
+            timezone: None,
+        })
+        .await;
+
+        let expected = r#"<C:calendar-query xmlns:D="DAV:" xmlns:C="urn:ietf:params:xml:ns:caldav">
+    <D:prop>
+        <D:getetag/>
+        <C:calendar-data>
+            <C:comp name="VCALENDAR">
+                <C:prop name="VERSION"/>
+                <C:comp name="VEVENT">
+                    <C:prop name="SUMMARY"/>
+                    <C:prop name="UID"/>
+                    <C:prop name="DTSTART"/>
+                    <C:prop name="DTEND"/>
+                    <C:prop name="DURATION"/>
+                    <C:prop name="RRULE"/>
+                    <C:prop name="RDATE"/>
+                    <C:prop name="EXRULE"/>
+                    <C:prop name="EXDATE"/>
+                    <C:prop name="RECURRENCE-ID"/>
+                </C:comp>
+                <C:comp name="VTIMEZONE"/>
+            </C:comp>
+        </C:calendar-data>
+    </D:prop>
+    <C:filter>
+        <C:comp-filter name="VCALENDAR">
+            <C:comp-filter name="VEVENT">
+                <C:time-range start="20060104T000000Z" end="20060105T000000Z"/>
+            </C:comp-filter>
+        </C:comp-filter>
+    </C:filter>
+</C:calendar-query>"#;
+
+        assert_eq!(
+            &got, expected,
+            "\n---GOT---\n{got}\n---EXP---\n{expected}\n"
+        );
+    }
+
+    #[tokio::test]
+    async fn rfc_calendar_query1_res() {
+        let got = serialize(&dav::Multistatus::<Calendar> {
+            extension: None,
+            responses: vec![
+                dav::Response {
+                    status_or_propstat: dav::StatusOrPropstat::PropStat(
+                        dav::Href("http://cal.example.com/bernard/work/abcd2.ics".into()),
+                        vec![dav::PropStat {
+                            prop: dav::AnyProp(vec![
+                                dav::AnyProperty::Value(dav::Property::GetEtag(
+                                    "\"fffff-abcd2\"".into(),
+                                )),
+                                dav::AnyProperty::Value(dav::Property::Extension(
+                                    Property::CalendarData(CalendarDataPayload {
+                                        mime: None,
+                                        payload: "PLACEHOLDER".into(),
+                                    }),
+                                )),
+                            ]),
+                            status: dav::Status(http::status::StatusCode::OK),
+                            error: None,
+                            responsedescription: None,
+                        }],
+                    ),
+                    location: None,
+                    error: None,
+                    responsedescription: None,
+                },
+                dav::Response {
+                    status_or_propstat: dav::StatusOrPropstat::PropStat(
+                        dav::Href("http://cal.example.com/bernard/work/abcd3.ics".into()),
+                        vec![dav::PropStat {
+                            prop: dav::AnyProp(vec![
+                                dav::AnyProperty::Value(dav::Property::GetEtag(
+                                    "\"fffff-abcd3\"".into(),
+                                )),
+                                dav::AnyProperty::Value(dav::Property::Extension(
+                                    Property::CalendarData(CalendarDataPayload {
+                                        mime: None,
+                                        payload: "PLACEHOLDER".into(),
+                                    }),
+                                )),
+                            ]),
+                            status: dav::Status(http::status::StatusCode::OK),
+                            error: None,
+                            responsedescription: None,
+                        }],
+                    ),
+                    location: None,
+                    error: None,
+                    responsedescription: None,
+                },
+            ],
+            responsedescription: None,
+        })
+        .await;
+
+        let expected = r#"<D:multistatus xmlns:D="DAV:" xmlns:C="urn:ietf:params:xml:ns:caldav">
+    <D:response>
+        <D:href>http://cal.example.com/bernard/work/abcd2.ics</D:href>
+        <D:propstat>
+            <D:prop>
+                <D:getetag>&quot;fffff-abcd2&quot;</D:getetag>
+                <C:calendar-data>PLACEHOLDER</C:calendar-data>
+            </D:prop>
+            <D:status>HTTP/1.1 200 OK</D:status>
+        </D:propstat>
+    </D:response>
+    <D:response>
+        <D:href>http://cal.example.com/bernard/work/abcd3.ics</D:href>
+        <D:propstat>
+            <D:prop>
+                <D:getetag>&quot;fffff-abcd3&quot;</D:getetag>
+                <C:calendar-data>PLACEHOLDER</C:calendar-data>
+            </D:prop>
+            <D:status>HTTP/1.1 200 OK</D:status>
+        </D:propstat>
+    </D:response>
+</D:multistatus>"#;
+
+        assert_eq!(
+            &got, expected,
+            "\n---GOT---\n{got}\n---EXP---\n{expected}\n"
+        );
+    }
+}
diff --git a/aero-dav/src/caltypes.rs b/aero-dav/src/caltypes.rs
new file mode 100644
index 0000000..a4f6fef
--- /dev/null
+++ b/aero-dav/src/caltypes.rs
@@ -0,0 +1,1500 @@
+#![allow(dead_code)]
+
+use super::types as dav;
+use chrono::{DateTime, Utc};
+
+pub const FLOATING_DATETIME_FMT: &str = "%Y%m%dT%H%M%S";
+pub const UTC_DATETIME_FMT: &str = "%Y%m%dT%H%M%SZ";
+
+//@FIXME ACL (rfc3744) is missing, required
+//@FIXME Versioning (rfc3253) is missing, required
+//@FIXME WebDAV sync (rfc6578) is missing, optional
+// For reference, SabreDAV guide gives high-level & real-world overview:
+// https://sabre.io/dav/building-a-caldav-client/
+// For reference, non-official extensions documented by SabreDAV:
+// https://github.com/apple/ccs-calendarserver/tree/master/doc/Extensions
+
+// ----- Root elements -----
+
+// --- (MKCALENDAR PART) ---
+
+/// If a request body is included, it MUST be a CALDAV:mkcalendar XML
+/// element.  Instruction processing MUST occur in the order
+/// instructions are received (i.e., from top to bottom).
+/// Instructions MUST either all be executed or none executed.  Thus,
+/// if any error occurs during processing, all executed instructions
+/// MUST be undone and a proper error result returned.  Instruction
+/// processing details can be found in the definition of the DAV:set
+/// instruction in Section 12.13.2 of [RFC2518].
+///
+/// ```xmlschema
+/// <!ELEMENT mkcalendar (DAV:set)>
+/// ```
+#[derive(Debug, PartialEq, Clone)]
+pub struct MkCalendar<E: dav::Extension>(pub dav::Set<E>);
+
+/// If a response body for a successful request is included, it MUST
+/// be a CALDAV:mkcalendar-response XML element.
+///
+/// <!ELEMENT mkcalendar-response ANY>
+///
+/// ----
+///
+/// ANY is not satisfying, so looking at RFC5689
+/// https://www.rfc-editor.org/rfc/rfc5689.html#section-5.2
+///
+/// Definition:
+///
+/// <!ELEMENT mkcol-response (propstat+)>
+#[derive(Debug, PartialEq, Clone)]
+pub struct MkCalendarResponse<E: dav::Extension>(pub Vec<dav::PropStat<E>>);
+
+// --- (REPORT PART) ---
+#[derive(Debug, PartialEq, Clone)]
+pub enum ReportTypeName {
+    Query,
+    Multiget,
+    FreeBusy,
+}
+
+#[derive(Debug, PartialEq, Clone)]
+pub enum ReportType<E: dav::Extension> {
+    Query(CalendarQuery<E>),
+    Multiget(CalendarMultiget<E>),
+    FreeBusy(FreeBusyQuery),
+}
+
+/// Name:  calendar-query
+///
+/// Namespace:  urn:ietf:params:xml:ns:caldav
+///
+/// Purpose:  Defines a report for querying calendar object resources.
+///
+/// Description:  See Section 7.8.
+///
+/// Definition:
+///
+/// <!ELEMENT calendar-query ((DAV:allprop |
+///                            DAV:propname |
+///                            DAV:prop)?, filter, timezone?)>
+#[derive(Debug, PartialEq, Clone)]
+pub struct CalendarQuery<E: dav::Extension> {
+    pub selector: Option<CalendarSelector<E>>,
+    pub filter: Filter,
+    pub timezone: Option<TimeZone>,
+}
+
+///   Name:  calendar-multiget
+///
+/// Namespace:  urn:ietf:params:xml:ns:caldav
+///
+/// Purpose:  CalDAV report used to retrieve specific calendar object
+/// resources.
+///
+/// Description:  See Section 7.9.
+///
+/// Definition:
+///
+/// <!ELEMENT calendar-multiget ((DAV:allprop |
+///                               DAV:propname |
+///                               DAV:prop)?, DAV:href+)>
+#[derive(Debug, PartialEq, Clone)]
+pub struct CalendarMultiget<E: dav::Extension> {
+    pub selector: Option<CalendarSelector<E>>,
+    pub href: Vec<dav::Href>,
+}
+
+/// Name:  free-busy-query
+///
+/// Namespace:  urn:ietf:params:xml:ns:caldav
+///
+/// Purpose:  CalDAV report used to generate a VFREEBUSY to determine
+/// busy time over a specific time range.
+///
+/// Description:  See Section 7.10.
+///
+/// Definition:
+/// <!ELEMENT free-busy-query (time-range)>
+#[derive(Debug, PartialEq, Clone)]
+pub struct FreeBusyQuery(pub TimeRange);
+
+// ----- Hooks -----
+#[derive(Debug, PartialEq, Clone)]
+pub enum ResourceType {
+    Calendar,
+}
+
+/// Check the matching Property object for documentation
+#[derive(Debug, PartialEq, Clone)]
+pub enum PropertyRequest {
+    CalendarHomeSet,
+    CalendarDescription,
+    CalendarTimezone,
+    SupportedCalendarComponentSet,
+    SupportedCalendarData,
+    MaxResourceSize,
+    MinDateTime,
+    MaxDateTime,
+    MaxInstances,
+    MaxAttendeesPerInstance,
+    SupportedCollationSet,
+    CalendarData(CalendarDataRequest),
+}
+
+#[derive(Debug, PartialEq, Clone)]
+pub enum Property {
+    ///   Name:  calendar-home-set
+    ///
+    /// Namespace:  urn:ietf:params:xml:ns:caldav
+    ///
+    /// Purpose:  Identifies the URL of any WebDAV collections that contain
+    /// calendar collections owned by the associated principal resource.
+    ///
+    /// Conformance:  This property SHOULD be defined on a principal
+    /// resource.  If defined, it MAY be protected and SHOULD NOT be
+    /// returned by a PROPFIND DAV:allprop request (as defined in Section
+    /// 12.14.1 of [RFC2518]).
+    ///
+    /// Description:  The CALDAV:calendar-home-set property is meant to allow
+    /// users to easily find the calendar collections owned by the
+    /// principal.  Typically, users will group all the calendar
+    /// collections that they own under a common collection.  This
+    /// property specifies the URL of collections that are either calendar
+    /// collections or ordinary collections that have child or descendant
+    /// calendar collections owned by the principal.
+    ///
+    /// Definition:
+    ///
+    /// <!ELEMENT calendar-home-set (DAV:href*)>
+    CalendarHomeSet(dav::Href),
+
+    /// Name:  calendar-description
+    ///
+    /// Namespace:  urn:ietf:params:xml:ns:caldav
+    ///
+    /// Purpose:  Provides a human-readable description of the calendar
+    /// collection.
+    ///
+    /// Conformance:  This property MAY be defined on any calendar
+    /// collection.  If defined, it MAY be protected and SHOULD NOT be
+    /// returned by a PROPFIND DAV:allprop request (as defined in Section
+    /// 12.14.1 of [RFC2518]).  An xml:lang attribute indicating the human
+    /// language of the description SHOULD be set for this property by
+    /// clients or through server provisioning.  Servers MUST return any
+    /// xml:lang attribute if set for the property.
+    ///
+    /// Description:  If present, the property contains a description of the
+    /// calendar collection that is suitable for presentation to a user.
+    /// If not present, the client should assume no description for the
+    /// calendar collection.
+    ///
+    /// Definition:
+    ///
+    /// <!ELEMENT calendar-description (#PCDATA)>
+    /// PCDATA value: string
+    ///
+    /// Example:
+    ///
+    /// <C:calendar-description xml:lang="fr-CA"
+    ///     xmlns:C="urn:ietf:params:xml:ns:caldav"
+    /// >Calendrier de Mathilde Desruisseaux</C:calendar-description>
+    CalendarDescription { lang: Option<String>, text: String },
+
+    /// 5.2.2.  CALDAV:calendar-timezone Property
+    ///
+    /// Name:  calendar-timezone
+    ///
+    /// Namespace:  urn:ietf:params:xml:ns:caldav
+    ///
+    /// Purpose:  Specifies a time zone on a calendar collection.
+    ///
+    /// Conformance:  This property SHOULD be defined on all calendar
+    /// collections.  If defined, it SHOULD NOT be returned by a PROPFIND
+    /// DAV:allprop request (as defined in Section 12.14.1 of [RFC2518]).
+    ///
+    /// Description:  The CALDAV:calendar-timezone property is used to
+    /// specify the time zone the server should rely on to resolve "date"
+    /// values and "date with local time" values (i.e., floating time) to
+    /// "date with UTC time" values.  The server will require this
+    /// information to determine if a calendar component scheduled with
+    /// "date" values or "date with local time" values overlaps a CALDAV:
+    /// time-range specified in a CALDAV:calendar-query REPORT.  The
+    /// server will also require this information to compute the proper
+    /// FREEBUSY time period as "date with UTC time" in the VFREEBUSY
+    /// component returned in a response to a CALDAV:free-busy-query
+    /// REPORT request that takes into account calendar components
+    /// scheduled with "date" values or "date with local time" values.  In
+    /// the absence of this property, the server MAY rely on the time zone
+    /// of their choice.
+    ///
+    /// Note:  The iCalendar data embedded within the CALDAV:calendar-
+    /// timezone XML element MUST follow the standard XML character data
+    /// encoding rules, including use of &lt;, &gt;, &amp; etc. entity
+    /// encoding or the use of a <![CDATA[ ... ]]> construct.  In the
+    /// later case, the iCalendar data cannot contain the character
+    /// sequence "]]>", which is the end delimiter for the CDATA section.
+    ///
+    ///    Definition:
+    ///
+    /// ```xmlschema
+    /// <!ELEMENT calendar-timezone (#PCDATA)>
+    ///     PCDATA value: an iCalendar object with exactly one VTIMEZONE component.
+    /// ```
+    ///
+    /// Example:
+    ///
+    /// ```xmlschema
+    /// <C:calendar-timezone
+    ///     xmlns:C="urn:ietf:params:xml:ns:caldav">BEGIN:VCALENDAR
+    /// PRODID:-//Example Corp.//CalDAV Client//EN
+    /// VERSION:2.0
+    /// BEGIN:VTIMEZONE
+    /// TZID:US-Eastern
+    /// LAST-MODIFIED:19870101T000000Z
+    /// BEGIN:STANDARD
+    /// DTSTART:19671029T020000
+    /// RRULE:FREQ=YEARLY;BYDAY=-1SU;BYMONTH=10
+    /// TZOFFSETFROM:-0400
+    /// TZOFFSETTO:-0500
+    /// TZNAME:Eastern Standard Time (US &amp; Canada)
+    /// END:STANDARD
+    /// BEGIN:DAYLIGHT
+    /// DTSTART:19870405T020000
+    /// RRULE:FREQ=YEARLY;BYDAY=1SU;BYMONTH=4
+    /// TZOFFSETFROM:-0500
+    /// TZOFFSETTO:-0400
+    /// TZNAME:Eastern Daylight Time (US &amp; Canada)
+    /// END:DAYLIGHT
+    /// END:VTIMEZONE
+    /// END:VCALENDAR
+    /// </C:calendar-timezone>
+    /// ```
+    //@FIXME we might want to put a buffer here or an iCal parsed object
+    CalendarTimezone(String),
+
+    /// Name:  supported-calendar-component-set
+    ///
+    /// Namespace:  urn:ietf:params:xml:ns:caldav
+    ///
+    /// Purpose:  Specifies the calendar component types (e.g., VEVENT,
+    /// VTODO, etc.) that calendar object resources can contain in the
+    /// calendar collection.
+    ///
+    /// Conformance:  This property MAY be defined on any calendar
+    /// collection.  If defined, it MUST be protected and SHOULD NOT be
+    /// returned by a PROPFIND DAV:allprop request (as defined in Section
+    /// 12.14.1 of [RFC2518]).
+    ///
+    /// Description:  The CALDAV:supported-calendar-component-set property is
+    /// used to specify restrictions on the calendar component types that
+    /// calendar object resources may contain in a calendar collection.
+    /// Any attempt by the client to store calendar object resources with
+    /// component types not listed in this property, if it exists, MUST
+    /// result in an error, with the CALDAV:supported-calendar-component
+    /// precondition (Section 5.3.2.1) being violated.  Since this
+    /// property is protected, it cannot be changed by clients using a
+    /// PROPPATCH request.  However, clients can initialize the value of
+    /// this property when creating a new calendar collection with
+    /// MKCALENDAR.  The empty-element tag <C:comp name="VTIMEZONE"/> MUST
+    /// only be specified if support for calendar object resources that
+    /// only contain VTIMEZONE components is provided or desired.  Support
+    /// for VTIMEZONE components in calendar object resources that contain
+    /// VEVENT or VTODO components is always assumed.  In the absence of
+    /// this property, the server MUST accept all component types, and the
+    /// client can assume that all component types are accepted.
+    ///
+    /// Definition:
+    ///
+    /// <!ELEMENT supported-calendar-component-set (comp+)>
+    ///
+    /// Example:
+    ///
+    /// <C:supported-calendar-component-set
+    ///     xmlns:C="urn:ietf:params:xml:ns:caldav">
+    ///     <C:comp name="VEVENT"/>
+    ///     <C:comp name="VTODO"/>
+    /// </C:supported-calendar-component-set>
+    SupportedCalendarComponentSet(Vec<CompSupport>),
+
+    ///  Name:  supported-calendar-data
+    ///
+    /// Namespace:  urn:ietf:params:xml:ns:caldav
+    ///
+    /// Purpose:  Specifies what media types are allowed for calendar object
+    /// resources in a calendar collection.
+    ///
+    /// Conformance:  This property MAY be defined on any calendar
+    /// collection.  If defined, it MUST be protected and SHOULD NOT be
+    /// returned by a PROPFIND DAV:allprop request (as defined in Section
+    /// 12.14.1 of [RFC2518]).
+    ///
+    /// Description:  The CALDAV:supported-calendar-data property is used to
+    /// specify the media type supported for the calendar object resources
+    /// contained in a given calendar collection (e.g., iCalendar version
+    /// 2.0).  Any attempt by the client to store calendar object
+    /// resources with a media type not listed in this property MUST
+    /// result in an error, with the CALDAV:supported-calendar-data
+    /// precondition (Section 5.3.2.1) being violated.  In the absence of
+    /// this property, the server MUST only accept data with the media
+    /// type "text/calendar" and iCalendar version 2.0, and clients can
+    /// assume that the server will only accept this data.
+    ///
+    /// Definition:
+    ///
+    /// <!ELEMENT supported-calendar-data (calendar-data+)>
+    ///
+    /// Example:
+    ///
+    /// <C:supported-calendar-data
+    ///     xmlns:C="urn:ietf:params:xml:ns:caldav">
+    ///     <C:calendar-data content-type="text/calendar" version="2.0"/>
+    /// </C:supported-calendar-data>
+    ///
+    /// -----
+    ///
+    /// <!ELEMENT calendar-data EMPTY>
+    ///
+    /// when nested in the CALDAV:supported-calendar-data property
+    /// to specify a supported media type for calendar object
+    /// resources;
+    SupportedCalendarData(Vec<CalendarDataEmpty>),
+
+    ///  Name:  max-resource-size
+    ///
+    /// Namespace:  urn:ietf:params:xml:ns:caldav
+    ///
+    /// Purpose:  Provides a numeric value indicating the maximum size of a
+    /// resource in octets that the server is willing to accept when a
+    /// calendar object resource is stored in a calendar collection.
+    ///
+    /// Conformance:  This property MAY be defined on any calendar
+    /// collection.  If defined, it MUST be protected and SHOULD NOT be
+    /// returned by a PROPFIND DAV:allprop request (as defined in Section
+    /// 12.14.1 of [RFC2518]).
+    ///
+    /// Description:  The CALDAV:max-resource-size is used to specify a
+    /// numeric value that represents the maximum size in octets that the
+    /// server is willing to accept when a calendar object resource is
+    /// stored in a calendar collection.  Any attempt to store a calendar
+    /// object resource exceeding this size MUST result in an error, with
+    /// the CALDAV:max-resource-size precondition (Section 5.3.2.1) being
+    /// violated.  In the absence of this property, the client can assume
+    /// that the server will allow storing a resource of any reasonable
+    /// size.
+    ///
+    /// Definition:
+    ///
+    /// <!ELEMENT max-resource-size (#PCDATA)>
+    /// PCDATA value: a numeric value (positive integer)
+    ///
+    ///    Example:
+    ///
+    /// <C:max-resource-size xmlns:C="urn:ietf:params:xml:ns:caldav">
+    /// 102400
+    /// </C:max-resource-size>
+    MaxResourceSize(u64),
+
+    /// CALDAV:min-date-time Property
+    ///
+    /// Name:  min-date-time
+    ///
+    /// Namespace:  urn:ietf:params:xml:ns:caldav
+    ///
+    /// Purpose:  Provides a DATE-TIME value indicating the earliest date and
+    /// time (in UTC) that the server is willing to accept for any DATE or
+    /// DATE-TIME value in a calendar object resource stored in a calendar
+    /// collection.
+    ///
+    /// Conformance:  This property MAY be defined on any calendar
+    /// collection.  If defined, it MUST be protected and SHOULD NOT be
+    /// returned by a PROPFIND DAV:allprop request (as defined in Section
+    /// 12.14.1 of [RFC2518]).
+    ///
+    /// Description:  The CALDAV:min-date-time is used to specify an
+    /// iCalendar DATE-TIME value in UTC that indicates the earliest
+    /// inclusive date that the server is willing to accept for any
+    /// explicit DATE or DATE-TIME value in a calendar object resource
+    /// stored in a calendar collection.  Any attempt to store a calendar
+    /// object resource using a DATE or DATE-TIME value earlier than this
+    /// value MUST result in an error, with the CALDAV:min-date-time
+    /// precondition (Section 5.3.2.1) being violated.  Note that servers
+    /// MUST accept recurring components that specify instances beyond
+    /// this limit, provided none of those instances have been overridden.
+    /// In that case, the server MAY simply ignore those instances outside
+    /// of the acceptable range when processing reports on the calendar
+    /// object resource.  In the absence of this property, the client can
+    /// assume any valid iCalendar date may be used at least up to the
+    /// CALDAV:max-date-time value, if that is defined.
+    ///
+    /// Definition:
+    ///
+    /// <!ELEMENT min-date-time (#PCDATA)>
+    /// PCDATA value: an iCalendar format DATE-TIME value in UTC
+    ///
+    /// Example:
+    ///
+    /// <C:min-date-time xmlns:C="urn:ietf:params:xml:ns:caldav">
+    /// 19000101T000000Z
+    /// </C:min-date-time>
+    MinDateTime(DateTime<Utc>),
+
+    /// CALDAV:max-date-time Property
+    ///
+    /// Name:  max-date-time
+    ///
+    /// Namespace:  urn:ietf:params:xml:ns:caldav
+    ///
+    /// Purpose:  Provides a DATE-TIME value indicating the latest date and
+    /// time (in UTC) that the server is willing to accept for any DATE or
+    /// DATE-TIME value in a calendar object resource stored in a calendar
+    /// collection.
+    ///
+    /// Conformance:  This property MAY be defined on any calendar
+    /// collection.  If defined, it MUST be protected and SHOULD NOT be
+    /// returned by a PROPFIND DAV:allprop request (as defined in Section
+    /// 12.14.1 of [RFC2518]).
+    ///
+    /// Description:  The CALDAV:max-date-time is used to specify an
+    /// iCalendar DATE-TIME value in UTC that indicates the inclusive
+    /// latest date that the server is willing to accept for any date or
+    /// time value in a calendar object resource stored in a calendar
+    /// collection.  Any attempt to store a calendar object resource using
+    /// a DATE or DATE-TIME value later than this value MUST result in an
+    /// error, with the CALDAV:max-date-time precondition
+    /// (Section 5.3.2.1) being violated.  Note that servers MUST accept
+    /// recurring components that specify instances beyond this limit,
+    /// provided none of those instances have been overridden.  In that
+    /// case, the server MAY simply ignore those instances outside of the
+    /// acceptable range when processing reports on the calendar object
+    /// resource.  In the absence of this property, the client can assume
+    /// any valid iCalendar date may be used at least down to the CALDAV:
+    /// min-date-time value, if that is defined.
+    ///
+    /// Definition:
+    ///
+    /// <!ELEMENT max-date-time (#PCDATA)>
+    /// PCDATA value: an iCalendar format DATE-TIME value in UTC
+    ///
+    /// Example:
+    ///
+    /// <C:max-date-time xmlns:C="urn:ietf:params:xml:ns:caldav">
+    /// 20491231T235959Z
+    /// </C:max-date-time>
+    MaxDateTime(DateTime<Utc>),
+
+    /// CALDAV:max-instances Property
+    ///
+    /// Name:  max-instances
+    ///
+    /// Namespace:  urn:ietf:params:xml:ns:caldav
+    ///
+    /// Purpose:  Provides a numeric value indicating the maximum number of
+    /// recurrence instances that a calendar object resource stored in a
+    /// calendar collection can generate.
+    ///
+    /// Conformance:  This property MAY be defined on any calendar
+    /// collection.  If defined, it MUST be protected and SHOULD NOT be
+    /// returned by a PROPFIND DAV:allprop request (as defined in Section
+    /// 12.14.1 of [RFC2518]).
+    ///
+    /// Description:  The CALDAV:max-instances is used to specify a numeric
+    /// value that indicates the maximum number of recurrence instances
+    /// that a calendar object resource stored in a calendar collection
+    /// can generate.  Any attempt to store a calendar object resource
+    /// with a recurrence pattern that generates more instances than this
+    /// value MUST result in an error, with the CALDAV:max-instances
+    /// precondition (Section 5.3.2.1) being violated.  In the absence of
+    /// this property, the client can assume that the server has no limits
+    /// on the number of recurrence instances it can handle or expand.
+    ///
+    /// Definition:
+    ///
+    /// <!ELEMENT max-instances (#PCDATA)>
+    /// PCDATA value: a numeric value (integer greater than zero)
+    ///
+    /// Example:
+    ///
+    /// <C:max-instances xmlns:C="urn:ietf:params:xml:ns:caldav">
+    /// 100
+    /// </C:max-instances>
+    MaxInstances(u64),
+
+    ///  CALDAV:max-attendees-per-instance Property
+    ///
+    /// Name:  max-attendees-per-instance
+    ///
+    /// Namespace:  urn:ietf:params:xml:ns:caldav
+    ///
+    /// Purpose:  Provides a numeric value indicating the maximum number of
+    /// ATTENDEE properties in any instance of a calendar object resource
+    /// stored in a calendar collection.
+    ///
+    /// Conformance:  This property MAY be defined on any calendar
+    /// collection.  If defined, it MUST be protected and SHOULD NOT be
+    /// returned by a PROPFIND DAV:allprop request (as defined in Section
+    /// 12.14.1 of [RFC2518]).
+    ///
+    /// Description:  The CALDAV:max-attendees-per-instance is used to
+    /// specify a numeric value that indicates the maximum number of
+    /// iCalendar ATTENDEE properties on any one instance of a calendar
+    /// object resource stored in a calendar collection.  Any attempt to
+    /// store a calendar object resource with more ATTENDEE properties per
+    /// instance than this value MUST result in an error, with the CALDAV:
+    /// max-attendees-per-instance precondition (Section 5.3.2.1) being
+    /// violated.  In the absence of this property, the client can assume
+    /// that the server can handle any number of ATTENDEE properties in a
+    /// calendar component.
+    ///
+    /// Definition:
+    ///
+    /// <!ELEMENT max-attendees-per-instance (#PCDATA)>
+    /// PCDATA value: a numeric value (integer greater than zero)
+    ///
+    /// Example:
+    ///
+    /// <C:max-attendees-per-instance
+    ///     xmlns:C="urn:ietf:params:xml:ns:caldav">
+    /// 25
+    /// </C:max-attendees-per-instance>
+    MaxAttendeesPerInstance(u64),
+
+    ///  Name:  supported-collation-set
+    ///
+    /// Namespace:  urn:ietf:params:xml:ns:caldav
+    ///
+    /// Purpose:  Identifies the set of collations supported by the server
+    /// for text matching operations.
+    ///
+    /// Conformance:  This property MUST be defined on any resource that
+    /// supports a report that does text matching.  If defined, it MUST be
+    /// protected and SHOULD NOT be returned by a PROPFIND DAV:allprop
+    /// request (as defined in Section 12.14.1 of [RFC2518]).
+    ///
+    /// Description:  The CALDAV:supported-collation-set property contains
+    /// zero or more CALDAV:supported-collation elements, which specify
+    /// the collection identifiers of the collations supported by the
+    /// server.
+    ///
+    /// Definition:
+    ///
+    /// <!ELEMENT supported-collation-set (supported-collation*)>
+    /// <!ELEMENT supported-collation (#PCDATA)>
+    ///
+    /// Example:
+    ///
+    /// <C:supported-collation-set
+    ///     xmlns:C="urn:ietf:params:xml:ns:caldav">
+    ///   <C:supported-collation>i;ascii-casemap</C:supported-collation>
+    ///   <C:supported-collation>i;octet</C:supported-collation>
+    /// </C:supported-collation-set>
+    SupportedCollationSet(Vec<SupportedCollation>),
+
+    /// Name:  calendar-data
+    ///
+    /// Namespace:  urn:ietf:params:xml:ns:caldav
+    ///
+    /// Purpose:  Specified one of the following:
+    ///
+    /// 1.  A supported media type for calendar object resources when
+    ///     nested in the CALDAV:supported-calendar-data property;
+    ///
+    /// 2.  The parts of a calendar object resource should be returned by
+    ///     a calendaring report;
+    ///
+    /// 3.  The content of a calendar object resource in a response to a
+    ///     calendaring report.
+    ///
+    /// Description:  When nested in the CALDAV:supported-calendar-data
+    /// property, the CALDAV:calendar-data XML element specifies a media
+    /// type supported by the CalDAV server for calendar object resources.
+    ///
+    /// When used in a calendaring REPORT request, the CALDAV:calendar-
+    /// data XML element specifies which parts of calendar object
+    /// resources need to be returned in the response.  If the CALDAV:
+    /// calendar-data XML element doesn't contain any CALDAV:comp element,
+    /// calendar object resources will be returned in their entirety.
+    ///
+    /// Finally, when used in a calendaring REPORT response, the CALDAV:
+    /// calendar-data XML element specifies the content of a calendar
+    /// object resource.  Given that XML parsers normalize the two-
+    /// character sequence CRLF (US-ASCII decimal 13 and US-ASCII decimal
+    /// 10) to a single LF character (US-ASCII decimal 10), the CR
+    /// character (US-ASCII decimal 13) MAY be omitted in calendar object
+    /// resources specified in the CALDAV:calendar-data XML element.
+    /// Furthermore, calendar object resources specified in the CALDAV:
+    /// calendar-data XML element MAY be invalid per their media type
+    /// specification if the CALDAV:calendar-data XML element part of the
+    /// calendaring REPORT request did not specify required properties
+    /// (e.g., UID, DTSTAMP, etc.), or specified a CALDAV:prop XML element
+    /// with the "novalue" attribute set to "yes".
+    ///
+    /// Note:  The CALDAV:calendar-data XML element is specified in requests
+    /// and responses inside the DAV:prop XML element as if it were a
+    /// WebDAV property.  However, the CALDAV:calendar-data XML element is
+    /// not a WebDAV property and, as such, is not returned in PROPFIND
+    /// responses, nor used in PROPPATCH requests.
+    ///
+    /// Note:  The iCalendar data embedded within the CALDAV:calendar-data
+    /// XML element MUST follow the standard XML character data encoding
+    /// rules, including use of &lt;, &gt;, &amp; etc. entity encoding or
+    /// the use of a <![CDATA[ ... ]]> construct.  In the later case, the
+    /// iCalendar data cannot contain the character sequence "]]>", which
+    /// is the end delimiter for the CDATA section.
+    CalendarData(CalendarDataPayload),
+}
+
+#[derive(Debug, PartialEq, Clone)]
+pub enum Violation {
+    /// (DAV:resource-must-be-null): A resource MUST NOT exist at the
+    /// Request-URI;
+    ResourceMustBeNull,
+
+    /// (CALDAV:calendar-collection-location-ok): The Request-URI MUST
+    /// identify a location where a calendar collection can be created;
+    CalendarCollectionLocationOk,
+
+    /// (CALDAV:valid-calendar-data): The time zone specified in CALDAV:
+    /// calendar-timezone property MUST be a valid iCalendar object
+    /// containing a single valid VTIMEZONE component.
+    ValidCalendarData,
+
+    ///@FIXME should not be here but in RFC3744
+    /// !!! ERRATA 1002 !!!
+    /// (DAV:need-privileges): The DAV:bind privilege MUST be granted to
+    /// the current user on the parent collection of the Request-URI.
+    NeedPrivileges,
+
+    ///  (CALDAV:initialize-calendar-collection): A new calendar collection
+    /// exists at the Request-URI.  The DAV:resourcetype of the calendar
+    /// collection MUST contain both DAV:collection and CALDAV:calendar
+    /// XML elements.
+    InitializeCalendarCollection,
+
+    /// (CALDAV:supported-calendar-data): The resource submitted in the
+    /// PUT request, or targeted by a COPY or MOVE request, MUST be a
+    /// supported media type (i.e., iCalendar) for calendar object
+    /// resources;
+    SupportedCalendarData,
+
+    /// (CALDAV:valid-calendar-object-resource): The resource submitted in
+    /// the PUT request, or targeted by a COPY or MOVE request, MUST obey
+    /// all restrictions specified in Section 4.1 (e.g., calendar object
+    /// resources MUST NOT contain more than one type of calendar
+    /// component, calendar object resources MUST NOT specify the
+    /// iCalendar METHOD property, etc.);
+    ValidCalendarObjectResource,
+
+    /// (CALDAV:supported-calendar-component): The resource submitted in
+    /// the PUT request, or targeted by a COPY or MOVE request, MUST
+    /// contain a type of calendar component that is supported in the
+    /// targeted calendar collection;
+    SupportedCalendarComponent,
+
+    /// (CALDAV:no-uid-conflict): The resource submitted in the PUT
+    /// request, or targeted by a COPY or MOVE request, MUST NOT specify
+    /// an iCalendar UID property value already in use in the targeted
+    /// calendar collection or overwrite an existing calendar object
+    /// resource with one that has a different UID property value.
+    /// Servers SHOULD report the URL of the resource that is already
+    /// making use of the same UID property value in the DAV:href element;
+    ///
+    /// <!ELEMENT no-uid-conflict (DAV:href)>
+    NoUidConflict(dav::Href),
+
+    /// (CALDAV:max-resource-size): The resource submitted in the PUT
+    /// request, or targeted by a COPY or MOVE request, MUST have an octet
+    /// size less than or equal to the value of the CALDAV:max-resource-
+    /// size property value (Section 5.2.5) on the calendar collection
+    /// where the resource will be stored;
+    MaxResourceSize,
+
+    /// (CALDAV:min-date-time): The resource submitted in the PUT request,
+    /// or targeted by a COPY or MOVE request, MUST have all of its
+    /// iCalendar DATE or DATE-TIME property values (for each recurring
+    /// instance) greater than or equal to the value of the CALDAV:min-
+    /// date-time property value (Section 5.2.6) on the calendar
+    /// collection where the resource will be stored;
+    MinDateTime,
+
+    /// (CALDAV:max-date-time): The resource submitted in the PUT request,
+    /// or targeted by a COPY or MOVE request, MUST have all of its
+    /// iCalendar DATE or DATE-TIME property values (for each recurring
+    /// instance) less than the value of the CALDAV:max-date-time property
+    /// value (Section 5.2.7) on the calendar collection where the
+    /// resource will be stored;
+    MaxDateTime,
+
+    /// (CALDAV:max-instances): The resource submitted in the PUT request,
+    /// or targeted by a COPY or MOVE request, MUST generate a number of
+    /// recurring instances less than or equal to the value of the CALDAV:
+    /// max-instances property value (Section 5.2.8) on the calendar
+    /// collection where the resource will be stored;
+    MaxInstances,
+
+    /// (CALDAV:max-attendees-per-instance): The resource submitted in the
+    /// PUT request, or targeted by a COPY or MOVE request, MUST have a
+    /// number of ATTENDEE properties on any one instance less than or
+    /// equal to the value of the CALDAV:max-attendees-per-instance
+    /// property value (Section 5.2.9) on the calendar collection where
+    /// the resource will be stored;
+    MaxAttendeesPerInstance,
+
+    /// (CALDAV:valid-filter): The CALDAV:filter XML element (see
+    /// Section 9.7) specified in the REPORT request MUST be valid.  For
+    /// instance, a CALDAV:filter cannot nest a <C:comp name="VEVENT">
+    /// element in a <C:comp name="VTODO"> element, and a CALDAV:filter
+    /// cannot nest a <C:time-range start="..." end="..."> element in a
+    /// <C:prop name="SUMMARY"> element.
+    ValidFilter,
+
+    /// (CALDAV:supported-filter): The CALDAV:comp-filter (see
+    /// Section 9.7.1), CALDAV:prop-filter (see Section 9.7.2), and
+    /// CALDAV:param-filter (see Section 9.7.3) XML elements used in the
+    /// CALDAV:filter XML element (see Section 9.7) in the REPORT request
+    /// only make reference to components, properties, and parameters for
+    /// which queries are supported by the server, i.e., if the CALDAV:
+    /// filter element attempts to reference an unsupported component,
+    /// property, or parameter, this precondition is violated.  Servers
+    /// SHOULD report the CALDAV:comp-filter, CALDAV:prop-filter, or
+    /// CALDAV:param-filter for which it does not provide support.
+    ///
+    /// <!ELEMENT supported-filter (comp-filter*,
+    ///                             prop-filter*,
+    ///                             param-filter*)>
+    SupportedFilter {
+        comp: Vec<CompFilter>,
+        prop: Vec<PropFilter>,
+        param: Vec<ParamFilter>,
+    },
+
+    /// (DAV:number-of-matches-within-limits): The number of matching
+    /// calendar object resources must fall within server-specific,
+    /// predefined limits.  For example, this condition might be triggered
+    /// if a search specification would cause the return of an extremely
+    /// large number of responses.
+    NumberOfMatchesWithinLimits,
+}
+
+// -------- Inner XML elements ---------
+
+/// Some of the reports defined in this section do text matches of
+/// character strings provided by the client and are compared to stored
+/// calendar data.  Since iCalendar data is, by default, encoded in the
+/// UTF-8 charset and may include characters outside the US-ASCII charset
+/// range in some property and parameter values, there is a need to
+/// ensure that text matching follows well-defined rules.
+///
+/// To deal with this, this specification makes use of the IANA Collation
+/// Registry defined in [RFC4790] to specify collations that may be used
+/// to carry out the text comparison operations with a well-defined rule.
+///
+/// The comparisons used in CalDAV are all "substring" matches, as per
+/// [RFC4790], Section 4.2.  Collations supported by the server MUST
+/// support "substring" match operations.
+///
+/// CalDAV servers are REQUIRED to support the "i;ascii-casemap" and
+/// "i;octet" collations, as described in [RFC4790], and MAY support
+/// other collations.
+///
+/// Servers MUST advertise the set of collations that they support via
+/// the CALDAV:supported-collation-set property defined on any resource
+/// that supports reports that use collations.
+///
+/// Clients MUST only use collations from the list advertised by the
+/// server.
+///
+/// In the absence of a collation explicitly specified by the client, or
+/// if the client specifies the "default" collation identifier (as
+/// defined in [RFC4790], Section 3.1), the server MUST default to using
+/// "i;ascii-casemap" as the collation.
+///
+/// Wildcards (as defined in [RFC4790], Section 3.2) MUST NOT be used in
+/// the collation identifier.
+///
+/// If the client chooses a collation not supported by the server, the
+/// server MUST respond with a CALDAV:supported-collation precondition
+/// error response.
+#[derive(Debug, PartialEq, Clone)]
+pub struct SupportedCollation(pub Collation);
+
+/// <!ELEMENT calendar-data (#PCDATA)>
+/// PCDATA value: iCalendar object
+///
+/// when nested in the DAV:prop XML element in a calendaring
+/// REPORT response to specify the content of a returned
+/// calendar object resource.
+#[derive(Debug, PartialEq, Clone)]
+pub struct CalendarDataPayload {
+    pub mime: Option<CalendarDataSupport>,
+    pub payload: String,
+}
+
+/// <!ELEMENT calendar-data (comp?,
+///                          (expand | limit-recurrence-set)?,
+///                          limit-freebusy-set?)>
+///
+/// when nested in the DAV:prop XML element in a calendaring
+/// REPORT request to specify which parts of calendar object
+/// resources should be returned in the response;
+#[derive(Debug, PartialEq, Clone, Default)]
+pub struct CalendarDataRequest {
+    pub mime: Option<CalendarDataSupport>,
+    pub comp: Option<Comp>,
+    pub recurrence: Option<RecurrenceModifier>,
+    pub limit_freebusy_set: Option<LimitFreebusySet>,
+}
+
+/// calendar-data specialization for Property
+///
+/// <!ELEMENT calendar-data EMPTY>
+///
+/// when nested in the CALDAV:supported-calendar-data property
+/// to specify a supported media type for calendar object
+/// resources;
+#[derive(Debug, PartialEq, Clone)]
+pub struct CalendarDataEmpty(pub Option<CalendarDataSupport>);
+
+/// <!ATTLIST calendar-data content-type CDATA "text/calendar"
+///                         version CDATA "2.0">
+/// content-type value: a MIME media type
+/// version value: a version string
+/// attributes can be used on all three variants of the
+/// CALDAV:calendar-data XML element.
+#[derive(Debug, PartialEq, Clone)]
+pub struct CalendarDataSupport {
+    pub content_type: String,
+    pub version: String,
+}
+
+/// Name:  comp
+///
+/// Namespace:  urn:ietf:params:xml:ns:caldav
+///
+/// Purpose:  Defines which component types to return.
+///
+/// Description:  The name value is a calendar component name (e.g.,
+/// VEVENT).
+///
+/// Definition:
+///
+/// <!ELEMENT comp ((allprop | prop*), (allcomp | comp*))>
+/// <!ATTLIST comp name CDATA #REQUIRED>
+/// name value: a calendar component name
+///
+/// Note:  The CALDAV:prop and CALDAV:allprop elements have the same name
+/// as the DAV:prop and DAV:allprop elements defined in [RFC2518].
+/// However, the CALDAV:prop and CALDAV:allprop elements are defined
+/// in the "urn:ietf:params:xml:ns:caldav" namespace instead of the
+/// "DAV:" namespace.
+#[derive(Debug, PartialEq, Clone)]
+pub struct Comp {
+    pub name: Component,
+    pub prop_kind: Option<PropKind>,
+    pub comp_kind: Option<CompKind>,
+}
+
+/// For SupportedCalendarComponentSet
+///
+/// Definition:
+///
+/// <!ELEMENT supported-calendar-component-set (comp+)>
+///
+/// Example:
+///
+/// <C:supported-calendar-component-set
+///     xmlns:C="urn:ietf:params:xml:ns:caldav">
+///     <C:comp name="VEVENT"/>
+///     <C:comp name="VTODO"/>
+/// </C:supported-calendar-component-set>
+#[derive(Debug, PartialEq, Clone)]
+pub struct CompSupport(pub Component);
+
+/// Name:  allcomp
+///
+/// Namespace:  urn:ietf:params:xml:ns:caldav
+///
+/// Purpose:  Specifies that all components shall be returned.
+///
+/// Description:  The CALDAV:allcomp XML element can be used when the
+/// client wants all types of components returned by a calendaring
+/// REPORT request.
+///
+/// Definition:
+///
+/// <!ELEMENT allcomp EMPTY>
+#[derive(Debug, PartialEq, Clone)]
+pub enum CompKind {
+    AllComp,
+    Comp(Vec<Comp>),
+}
+
+/// Name:  allprop
+///
+/// Namespace:  urn:ietf:params:xml:ns:caldav
+///
+/// Purpose:  Specifies that all properties shall be returned.
+///
+/// Description:  The CALDAV:allprop XML element can be used when the
+/// client wants all properties of components returned by a
+/// calendaring REPORT request.
+///
+/// Definition:
+///
+/// <!ELEMENT allprop EMPTY>
+///
+/// Note:  The CALDAV:allprop element has the same name as the DAV:
+/// allprop element defined in [RFC2518].  However, the CALDAV:allprop
+/// element is defined in the "urn:ietf:params:xml:ns:caldav"
+/// namespace instead of the "DAV:" namespace.
+#[derive(Debug, PartialEq, Clone)]
+pub enum PropKind {
+    AllProp,
+    Prop(Vec<CalProp>),
+}
+
+/// Name:  prop
+///
+/// Namespace:  urn:ietf:params:xml:ns:caldav
+///
+/// Purpose:  Defines which properties to return in the response.
+///
+/// Description:  The "name" attribute specifies the name of the calendar
+/// property to return (e.g., ATTENDEE).  The "novalue" attribute can
+/// be used by clients to request that the actual value of the
+/// property not be returned (if the "novalue" attribute is set to
+/// "yes").  In that case, the server will return just the iCalendar
+/// property name and any iCalendar parameters and a trailing ":"
+/// without the subsequent value data.
+///
+/// Definition:
+/// <!ELEMENT prop EMPTY>
+/// <!ATTLIST prop name CDATA #REQUIRED novalue (yes | no) "no">
+/// name value: a calendar property name
+/// novalue value: "yes" or "no"
+///
+/// Note:  The CALDAV:prop element has the same name as the DAV:prop
+/// element defined in [RFC2518].  However, the CALDAV:prop element is
+/// defined in the "urn:ietf:params:xml:ns:caldav" namespace instead
+/// of the "DAV:" namespace.
+#[derive(Debug, PartialEq, Clone)]
+pub struct CalProp {
+    pub name: ComponentProperty,
+    pub novalue: Option<bool>,
+}
+
+#[derive(Debug, PartialEq, Clone)]
+pub enum RecurrenceModifier {
+    Expand(Expand),
+    LimitRecurrenceSet(LimitRecurrenceSet),
+}
+
+/// Name:  expand
+///
+/// Namespace:  urn:ietf:params:xml:ns:caldav
+///
+/// Purpose:  Forces the server to expand recurring components into
+/// individual recurrence instances.
+///
+/// Description:  The CALDAV:expand XML element specifies that for a
+/// given calendaring REPORT request, the server MUST expand the
+/// recurrence set into calendar components that define exactly one
+/// recurrence instance, and MUST return only those whose scheduled
+/// time intersect a specified time range.
+///
+/// The "start" attribute specifies the inclusive start of the time
+/// range, and the "end" attribute specifies the non-inclusive end of
+/// the time range.  Both attributes are specified as date with UTC
+/// time value.  The value of the "end" attribute MUST be greater than
+/// the value of the "start" attribute.
+///
+/// The server MUST use the same logic as defined for CALDAV:time-
+/// range to determine if a recurrence instance intersects the
+/// specified time range.
+///
+/// Recurring components, other than the initial instance, MUST
+/// include a RECURRENCE-ID property indicating which instance they
+/// refer to.
+///
+/// The returned calendar components MUST NOT use recurrence
+/// properties (i.e., EXDATE, EXRULE, RDATE, and RRULE) and MUST NOT
+/// have reference to or include VTIMEZONE components.  Date and local
+/// time with reference to time zone information MUST be converted
+/// into date with UTC time.
+///
+/// Definition:
+///
+/// <!ELEMENT expand EMPTY>
+/// <!ATTLIST expand start CDATA #REQUIRED
+///                  end   CDATA #REQUIRED>
+/// start value: an iCalendar "date with UTC time"
+/// end value: an iCalendar "date with UTC time"
+#[derive(Debug, PartialEq, Clone)]
+pub struct Expand(pub DateTime<Utc>, pub DateTime<Utc>);
+
+/// CALDAV:limit-recurrence-set XML Element
+///
+/// Name:  limit-recurrence-set
+///
+/// Namespace:  urn:ietf:params:xml:ns:caldav
+///
+/// Purpose:  Specifies a time range to limit the set of "overridden
+/// components" returned by the server.
+///
+/// Description:  The CALDAV:limit-recurrence-set XML element specifies
+/// that for a given calendaring REPORT request, the server MUST
+/// return, in addition to the "master component", only the
+/// "overridden components" that impact a specified time range.  An
+/// overridden component impacts a time range if its current start and
+/// end times overlap the time range, or if the original start and end
+/// times -- the ones that would have been used if the instance were
+/// not overridden -- overlap the time range.
+///
+/// The "start" attribute specifies the inclusive start of the time
+/// range, and the "end" attribute specifies the non-inclusive end of
+/// the time range.  Both attributes are specified as date with UTC
+/// time value.  The value of the "end" attribute MUST be greater than
+/// the value of the "start" attribute.
+///
+/// The server MUST use the same logic as defined for CALDAV:time-
+/// range to determine if the current or original scheduled time of an
+/// "overridden" recurrence instance intersects the specified time
+/// range.
+///
+/// Overridden components that have a RANGE parameter on their
+/// RECURRENCE-ID property may specify one or more instances in the
+/// recurrence set, and some of those instances may fall within the
+/// specified time range or may have originally fallen within the
+/// specified time range prior to being overridden.  If that is the
+/// case, the overridden component MUST be included in the results, as
+/// it has a direct impact on the interpretation of instances within
+/// the specified time range.
+///
+/// Definition:
+///
+/// <!ELEMENT limit-recurrence-set EMPTY>
+/// <!ATTLIST limit-recurrence-set start CDATA #REQUIRED
+///                                end   CDATA #REQUIRED>
+/// start value: an iCalendar "date with UTC time"
+/// end value: an iCalendar "date with UTC time"
+#[derive(Debug, PartialEq, Clone)]
+pub struct LimitRecurrenceSet(pub DateTime<Utc>, pub DateTime<Utc>);
+
+/// Name:  limit-freebusy-set
+///
+/// Namespace:  urn:ietf:params:xml:ns:caldav
+///
+/// Purpose:  Specifies a time range to limit the set of FREEBUSY values
+/// returned by the server.
+///
+/// Description:  The CALDAV:limit-freebusy-set XML element specifies
+/// that for a given calendaring REPORT request, the server MUST only
+/// return the FREEBUSY property values of a VFREEBUSY component that
+/// intersects a specified time range.
+///
+/// The "start" attribute specifies the inclusive start of the time
+/// range, and the "end" attribute specifies the non-inclusive end of
+/// the time range.  Both attributes are specified as "date with UTC
+/// time" value.  The value of the "end" attribute MUST be greater
+/// than the value of the "start" attribute.
+///
+/// The server MUST use the same logic as defined for CALDAV:time-
+/// range to determine if a FREEBUSY property value intersects the
+/// specified time range.
+///
+/// Definition:
+/// <!ELEMENT limit-freebusy-set EMPTY>
+/// <!ATTLIST limit-freebusy-set start CDATA #REQUIRED
+///                              end   CDATA #REQUIRED>
+/// start value: an iCalendar "date with UTC time"
+/// end value: an iCalendar "date with UTC time"
+#[derive(Debug, PartialEq, Clone)]
+pub struct LimitFreebusySet(pub DateTime<Utc>, pub DateTime<Utc>);
+
+/// Used by CalendarQuery & CalendarMultiget
+#[derive(Debug, PartialEq, Clone)]
+pub enum CalendarSelector<E: dav::Extension> {
+    AllProp,
+    PropName,
+    Prop(dav::PropName<E>),
+}
+
+/// Name:  comp-filter
+///
+/// Namespace:  urn:ietf:params:xml:ns:caldav
+///
+/// Purpose:  Specifies search criteria on calendar components.
+///
+/// Description:  The CALDAV:comp-filter XML element specifies a query
+/// targeted at the calendar object (i.e., VCALENDAR) or at a specific
+/// calendar component type (e.g., VEVENT).  The scope of the
+/// CALDAV:comp-filter XML element is the calendar object when used as
+/// a child of the CALDAV:filter XML element.  The scope of the
+/// CALDAV:comp-filter XML element is the enclosing calendar component
+/// when used as a child of another CALDAV:comp-filter XML element.  A
+/// CALDAV:comp-filter is said to match if:
+///
+///   *  The CALDAV:comp-filter XML element is empty and the calendar
+///      object or calendar component type specified by the "name"
+///      attribute exists in the current scope;
+///
+///   or:
+///
+///   *  The CALDAV:comp-filter XML element contains a CALDAV:is-not-
+///      defined XML element and the calendar object or calendar
+///      component type specified by the "name" attribute does not exist
+///      in the current scope;
+///
+///   or:
+///
+///   *  The CALDAV:comp-filter XML element contains a CALDAV:time-range
+///      XML element and at least one recurrence instance in the
+///      targeted calendar component is scheduled to overlap the
+///      specified time range, and all specified CALDAV:prop-filter and
+///      CALDAV:comp-filter child XML elements also match the targeted
+///      calendar component;
+///
+///   or:
+///
+///   *  The CALDAV:comp-filter XML element only contains CALDAV:prop-
+///      filter and CALDAV:comp-filter child XML elements that all match
+///      the targeted calendar component.
+///
+/// Definition:
+///
+/// ```xmlschema
+/// <!ELEMENT comp-filter (is-not-defined | (time-range?,
+///                        prop-filter*, comp-filter*))>
+///
+///      <!ATTLIST comp-filter name CDATA #REQUIRED>
+///      name value: a calendar object or calendar component
+///                  type (e.g., VEVENT)
+/// ```
+#[derive(Debug, PartialEq, Clone)]
+pub struct CompFilter {
+    pub name: Component,
+    // Option 1 = None, Option 2, 3, 4 = Some
+    pub additional_rules: Option<CompFilterRules>,
+}
+#[derive(Debug, PartialEq, Clone)]
+pub enum CompFilterRules {
+    // Option 2
+    IsNotDefined,
+    // Options 3 & 4
+    Matches(CompFilterMatch),
+}
+#[derive(Debug, PartialEq, Clone)]
+pub struct CompFilterMatch {
+    pub time_range: Option<TimeRange>,
+    pub prop_filter: Vec<PropFilter>,
+    pub comp_filter: Vec<CompFilter>,
+}
+
+/// Name:  prop-filter
+///
+/// Namespace:  urn:ietf:params:xml:ns:caldav
+///
+/// Purpose:  Specifies search criteria on calendar properties.
+///
+/// Description:  The CALDAV:prop-filter XML element specifies a query
+/// targeted at a specific calendar property (e.g., CATEGORIES) in the
+/// scope of the enclosing calendar component.  A calendar property is
+/// said to match a CALDAV:prop-filter if:
+///
+///   *  The CALDAV:prop-filter XML element is empty and a property of
+///      the type specified by the "name" attribute exists in the
+///      enclosing calendar component;
+///
+///   or:
+///
+///   *  The CALDAV:prop-filter XML element contains a CALDAV:is-not-
+///      defined XML element and no property of the type specified by
+///      the "name" attribute exists in the enclosing calendar
+///      component;
+///
+///   or:
+///
+///   *  The CALDAV:prop-filter XML element contains a CALDAV:time-range
+///      XML element and the property value overlaps the specified time
+///      range, and all specified CALDAV:param-filter child XML elements
+///      also match the targeted property;
+///
+///   or:
+///
+///   *  The CALDAV:prop-filter XML element contains a CALDAV:text-match
+///      XML element and the property value matches it, and all
+///      specified CALDAV:param-filter child XML elements also match the
+///      targeted property;
+///
+/// Definition:
+///
+/// ```xmlschema
+/// <!ELEMENT prop-filter (is-not-defined |
+/// ((time-range | text-match)?,
+/// param-filter*))>
+///
+/// <!ATTLIST prop-filter name CDATA #REQUIRED>
+/// name value: a calendar property name (e.g., ATTENDEE)
+/// ```
+#[derive(Debug, PartialEq, Clone)]
+pub struct PropFilter {
+    pub name: ComponentProperty,
+    // None = Option 1, Some() = Option 2, 3 & 4
+    pub additional_rules: Option<PropFilterRules>,
+}
+#[derive(Debug, PartialEq, Clone)]
+pub enum PropFilterRules {
+    // Option 2
+    IsNotDefined,
+    // Options 3 & 4
+    Match(PropFilterMatch),
+}
+#[derive(Debug, PartialEq, Clone)]
+pub struct PropFilterMatch {
+    pub time_or_text: Option<TimeOrText>,
+    pub param_filter: Vec<ParamFilter>,
+}
+#[derive(Debug, PartialEq, Clone)]
+pub enum TimeOrText {
+    Time(TimeRange),
+    Text(TextMatch),
+}
+
+///  Name:  text-match
+///
+/// Namespace:  urn:ietf:params:xml:ns:caldav
+///
+/// Purpose:  Specifies a substring match on a property or parameter
+/// value.
+///
+/// Description:  The CALDAV:text-match XML element specifies text used
+/// for a substring match against the property or parameter value
+/// specified in a calendaring REPORT request.
+///
+/// The "collation" attribute is used to select the collation that the
+/// server MUST use for character string matching.  In the absence of
+/// this attribute, the server MUST use the "i;ascii-casemap"
+/// collation.
+///
+/// The "negate-condition" attribute is used to indicate that this
+/// test returns a match if the text matches when the attribute value
+/// is set to "no", or return a match if the text does not match, if
+/// the attribute value is set to "yes".  For example, this can be
+/// used to match components with a STATUS property not set to
+/// CANCELLED.
+///
+/// Definition:
+/// <!ELEMENT text-match (#PCDATA)>
+/// PCDATA value: string
+///  <!ATTLIST text-match collation        CDATA "i;ascii-casemap"
+///  negate-condition (yes | no) "no">
+#[derive(Debug, PartialEq, Clone)]
+pub struct TextMatch {
+    pub collation: Option<Collation>,
+    pub negate_condition: Option<bool>,
+    pub text: String,
+}
+
+/// Name:  param-filter
+///
+/// Namespace:  urn:ietf:params:xml:ns:caldav
+///
+/// Purpose:  Limits the search to specific parameter values.
+///
+/// Description:  The CALDAV:param-filter XML element specifies a query
+/// targeted at a specific calendar property parameter (e.g.,
+/// PARTSTAT) in the scope of the calendar property on which it is
+/// defined.  A calendar property parameter is said to match a CALDAV:
+/// param-filter if:
+///
+///   *  The CALDAV:param-filter XML element is empty and a parameter of
+///      the type specified by the "name" attribute exists on the
+///      calendar property being examined;
+///
+///   or:
+///
+///   *  The CALDAV:param-filter XML element contains a CALDAV:is-not-
+///      defined XML element and no parameter of the type specified by
+///      the "name" attribute exists on the calendar property being
+///      examined;
+///
+/// Definition:
+///
+/// ```xmlschema
+///      <!ELEMENT param-filter (is-not-defined | text-match?)>
+///
+///      <!ATTLIST param-filter name CDATA #REQUIRED>
+///        name value: a property parameter name (e.g., PARTSTAT)
+/// ```
+#[derive(Debug, PartialEq, Clone)]
+pub struct ParamFilter {
+    pub name: PropertyParameter,
+    pub additional_rules: Option<ParamFilterMatch>,
+}
+#[derive(Debug, PartialEq, Clone)]
+pub enum ParamFilterMatch {
+    IsNotDefined,
+    Match(TextMatch),
+}
+
+/// CALDAV:is-not-defined XML Element
+///
+/// Name:  is-not-defined
+///
+/// Namespace:  urn:ietf:params:xml:ns:caldav
+///
+/// Purpose:  Specifies that a match should occur if the enclosing
+/// component, property, or parameter does not exist.
+///
+/// Description:  The CALDAV:is-not-defined XML element specifies that a
+/// match occurs if the enclosing component, property, or parameter
+/// value specified in a calendaring REPORT request does not exist in
+/// the calendar data being tested.
+///
+/// Definition:
+/// <!ELEMENT is-not-defined EMPTY>
+/* CURRENTLY INLINED */
+
+/// Name:  timezone
+///
+/// Namespace:  urn:ietf:params:xml:ns:caldav
+///
+/// Purpose:  Specifies the time zone component to use when determining
+/// the results of a report.
+///
+/// Description:  The CALDAV:timezone XML element specifies that for a
+/// given calendaring REPORT request, the server MUST rely on the
+/// specified VTIMEZONE component instead of the CALDAV:calendar-
+/// timezone property of the calendar collection, in which the
+/// calendar object resource is contained to resolve "date" values and
+/// "date with local time" values (i.e., floating time) to "date with
+/// UTC time" values.  The server will require this information to
+/// determine if a calendar component scheduled with "date" values or
+/// "date with local time" values intersects a CALDAV:time-range
+/// specified in a CALDAV:calendar-query REPORT.
+///
+/// Note:  The iCalendar data embedded within the CALDAV:timezone XML
+/// element MUST follow the standard XML character data encoding
+/// rules, including use of &lt;, &gt;, &amp; etc. entity encoding or
+/// the use of a <![CDATA[ ... ]]> construct.  In the later case, the
+///
+/// iCalendar data cannot contain the character sequence "]]>", which
+/// is the end delimiter for the CDATA section.
+///
+/// Definition:
+///
+/// <!ELEMENT timezone (#PCDATA)>
+/// PCDATA value: an iCalendar object with exactly one VTIMEZONE
+#[derive(Debug, PartialEq, Clone)]
+pub struct TimeZone(pub String);
+
+/// Name:  filter
+///
+/// Namespace:  urn:ietf:params:xml:ns:caldav
+///
+/// Purpose:  Specifies a filter to limit the set of calendar components
+/// returned by the server.
+///
+/// Description:  The CALDAV:filter XML element specifies the search
+/// filter used to limit the calendar components returned by a
+/// calendaring REPORT request.
+///
+/// Definition:
+/// <!ELEMENT filter (comp-filter)>
+#[derive(Debug, PartialEq, Clone)]
+pub struct Filter(pub CompFilter);
+
+/// Name: time-range
+///
+/// Definition:
+///
+/// <!ELEMENT time-range EMPTY>
+/// <!ATTLIST time-range start CDATA #IMPLIED
+///                      end   CDATA #IMPLIED>
+/// start value: an iCalendar "date with UTC time"
+/// end value: an iCalendar "date with UTC time"
+#[derive(Debug, PartialEq, Clone)]
+pub enum TimeRange {
+    OnlyStart(DateTime<Utc>),
+    OnlyEnd(DateTime<Utc>),
+    FullRange(DateTime<Utc>, DateTime<Utc>),
+}
+
+// ----------------------- ENUM ATTRIBUTES ---------------------
+
+/// Known components
+#[derive(Debug, PartialEq, Clone)]
+pub enum Component {
+    VCalendar,
+    VJournal,
+    VFreeBusy,
+    VEvent,
+    VTodo,
+    VAlarm,
+    VTimeZone,
+    Unknown(String),
+}
+impl Component {
+    pub fn as_str<'a>(&'a self) -> &'a str {
+        match self {
+            Self::VCalendar => "VCALENDAR",
+            Self::VJournal => "VJOURNAL",
+            Self::VFreeBusy => "VFREEBUSY",
+            Self::VEvent => "VEVENT",
+            Self::VTodo => "VTODO",
+            Self::VAlarm => "VALARM",
+            Self::VTimeZone => "VTIMEZONE",
+            Self::Unknown(c) => c,
+        }
+    }
+    pub fn new(v: String) -> Self {
+        match v.as_str() {
+            "VCALENDAR" => Self::VCalendar,
+            "VJOURNAL" => Self::VJournal,
+            "VFREEBUSY" => Self::VFreeBusy,
+            "VEVENT" => Self::VEvent,
+            "VTODO" => Self::VTodo,
+            "VALARM" => Self::VAlarm,
+            "VTIMEZONE" => Self::VTimeZone,
+            _ => Self::Unknown(v),
+        }
+    }
+}
+
+/// name="VERSION", name="SUMMARY", etc.
+/// Can be set on different objects: VCalendar, VEvent, etc.
+/// Might be replaced by an enum later
+#[derive(Debug, PartialEq, Clone)]
+pub struct ComponentProperty(pub String);
+
+/// like PARSTAT
+#[derive(Debug, PartialEq, Clone)]
+pub struct PropertyParameter(pub String);
+impl PropertyParameter {
+    pub fn as_str<'a>(&'a self) -> &'a str {
+        self.0.as_str()
+    }
+}
+
+#[derive(Default, Debug, PartialEq, Clone)]
+pub enum Collation {
+    #[default]
+    AsciiCaseMap,
+    Octet,
+    Unknown(String),
+}
+impl Collation {
+    pub fn as_str<'a>(&'a self) -> &'a str {
+        match self {
+            Self::AsciiCaseMap => "i;ascii-casemap",
+            Self::Octet => "i;octet",
+            Self::Unknown(c) => c.as_str(),
+        }
+    }
+    pub fn new(v: String) -> Self {
+        match v.as_str() {
+            "i;ascii-casemap" => Self::AsciiCaseMap,
+            "i;octet" => Self::Octet,
+            _ => Self::Unknown(v),
+        }
+    }
+}
diff --git a/aero-dav/src/decoder.rs b/aero-dav/src/decoder.rs
new file mode 100644
index 0000000..bb64455
--- /dev/null
+++ b/aero-dav/src/decoder.rs
@@ -0,0 +1,1152 @@
+use chrono::DateTime;
+use quick_xml::events::Event;
+
+use super::error::ParsingError;
+use super::types::*;
+use super::xml::{IRead, Node, QRead, Reader, DAV_URN};
+
+//@TODO (1) Rewrite all objects as Href,
+// where we return Ok(None) instead of trying to find the object at any cost.
+// Add a xml.find<E: Qread>() -> Result<Option<E>, ParsingError> or similar for the cases we
+// really need the object
+// (2) Rewrite QRead and replace Result<Option<_>, _> with Result<_, _>, not found being a possible
+// error.
+// (3) Rewrite vectors with xml.collect<E: QRead>() -> Result<Vec<E>, _>
+// (4) Something for alternatives like xml::choices on some lib would be great but no idea yet
+
+// ---- ROOT ----
+
+/// Propfind request
+impl<E: Extension> QRead<PropFind<E>> for PropFind<E> {
+    async fn qread(xml: &mut Reader<impl IRead>) -> Result<Self, ParsingError> {
+        xml.open(DAV_URN, "propfind").await?;
+        let propfind: PropFind<E> = loop {
+            // allprop
+            if let Some(_) = xml.maybe_open(DAV_URN, "allprop").await? {
+                xml.close().await?;
+                let includ = xml.maybe_find::<Include<E>>().await?;
+                break PropFind::AllProp(includ);
+            }
+
+            // propname
+            if let Some(_) = xml.maybe_open(DAV_URN, "propname").await? {
+                xml.close().await?;
+                break PropFind::PropName;
+            }
+
+            // prop
+            let (mut maybe_prop, mut dirty) = (None, false);
+            xml.maybe_read::<PropName<E>>(&mut maybe_prop, &mut dirty)
+                .await?;
+            if let Some(prop) = maybe_prop {
+                break PropFind::Prop(prop);
+            }
+
+            // not found, skipping
+            xml.skip().await?;
+        };
+        xml.close().await?;
+
+        Ok(propfind)
+    }
+}
+
+/// PROPPATCH request
+impl<E: Extension> QRead<PropertyUpdate<E>> for PropertyUpdate<E> {
+    async fn qread(xml: &mut Reader<impl IRead>) -> Result<Self, ParsingError> {
+        xml.open(DAV_URN, "propertyupdate").await?;
+        let collected_items = xml.collect::<PropertyUpdateItem<E>>().await?;
+        xml.close().await?;
+        Ok(PropertyUpdate(collected_items))
+    }
+}
+
+/// Generic response
+impl<E: Extension> QRead<Multistatus<E>> for Multistatus<E> {
+    async fn qread(xml: &mut Reader<impl IRead>) -> Result<Self, ParsingError> {
+        xml.open(DAV_URN, "multistatus").await?;
+        let mut responses = Vec::new();
+        let mut responsedescription = None;
+        let mut extension = None;
+
+        loop {
+            let mut dirty = false;
+            xml.maybe_push(&mut responses, &mut dirty).await?;
+            xml.maybe_read(&mut responsedescription, &mut dirty).await?;
+            xml.maybe_read(&mut extension, &mut dirty).await?;
+            if !dirty {
+                match xml.peek() {
+                    Event::End(_) => break,
+                    _ => xml.skip().await?,
+                };
+            }
+        }
+
+        xml.close().await?;
+        Ok(Multistatus {
+            responses,
+            responsedescription,
+            extension,
+        })
+    }
+}
+
+// LOCK REQUEST
+impl QRead<LockInfo> for LockInfo {
+    async fn qread(xml: &mut Reader<impl IRead>) -> Result<Self, ParsingError> {
+        xml.open(DAV_URN, "lockinfo").await?;
+        let (mut m_scope, mut m_type, mut owner) = (None, None, None);
+        loop {
+            let mut dirty = false;
+            xml.maybe_read::<LockScope>(&mut m_scope, &mut dirty)
+                .await?;
+            xml.maybe_read::<LockType>(&mut m_type, &mut dirty).await?;
+            xml.maybe_read::<Owner>(&mut owner, &mut dirty).await?;
+
+            if !dirty {
+                match xml.peek() {
+                    Event::End(_) => break,
+                    _ => xml.skip().await?,
+                };
+            }
+        }
+        xml.close().await?;
+        match (m_scope, m_type) {
+            (Some(lockscope), Some(locktype)) => Ok(LockInfo {
+                lockscope,
+                locktype,
+                owner,
+            }),
+            _ => Err(ParsingError::MissingChild),
+        }
+    }
+}
+
+// LOCK RESPONSE
+impl<E: Extension> QRead<PropValue<E>> for PropValue<E> {
+    async fn qread(xml: &mut Reader<impl IRead>) -> Result<Self, ParsingError> {
+        println!("---- propvalue");
+        xml.open(DAV_URN, "prop").await?;
+        let acc = xml.collect::<Property<E>>().await?;
+        xml.close().await?;
+        Ok(PropValue(acc))
+    }
+}
+
+/// Error response
+impl<E: Extension> QRead<Error<E>> for Error<E> {
+    async fn qread(xml: &mut Reader<impl IRead>) -> Result<Self, ParsingError> {
+        xml.open(DAV_URN, "error").await?;
+        let violations = xml.collect::<Violation<E>>().await?;
+        xml.close().await?;
+        Ok(Error(violations))
+    }
+}
+
+// ---- INNER XML
+impl<E: Extension> QRead<Response<E>> for Response<E> {
+    async fn qread(xml: &mut Reader<impl IRead>) -> Result<Self, ParsingError> {
+        xml.open(DAV_URN, "response").await?;
+        let (mut status, mut error, mut responsedescription, mut location) =
+            (None, None, None, None);
+        let mut href = Vec::new();
+        let mut propstat = Vec::new();
+
+        loop {
+            let mut dirty = false;
+            xml.maybe_read::<Status>(&mut status, &mut dirty).await?;
+            xml.maybe_push::<Href>(&mut href, &mut dirty).await?;
+            xml.maybe_push::<PropStat<E>>(&mut propstat, &mut dirty)
+                .await?;
+            xml.maybe_read::<Error<E>>(&mut error, &mut dirty).await?;
+            xml.maybe_read::<ResponseDescription>(&mut responsedescription, &mut dirty)
+                .await?;
+            xml.maybe_read::<Location>(&mut location, &mut dirty)
+                .await?;
+
+            if !dirty {
+                match xml.peek() {
+                    Event::End(_) => break,
+                    _ => xml.skip().await?,
+                };
+            }
+        }
+
+        xml.close().await?;
+        match (status, &propstat[..], &href[..]) {
+            (Some(status), &[], &[_, ..]) => Ok(Response {
+                status_or_propstat: StatusOrPropstat::Status(href, status),
+                error,
+                responsedescription,
+                location,
+            }),
+            (None, &[_, ..], &[_, ..]) => Ok(Response {
+                status_or_propstat: StatusOrPropstat::PropStat(
+                    href.into_iter().next().unwrap(),
+                    propstat,
+                ),
+                error,
+                responsedescription,
+                location,
+            }),
+            (Some(_), &[_, ..], _) => Err(ParsingError::InvalidValue),
+            _ => Err(ParsingError::MissingChild),
+        }
+    }
+}
+
+impl<E: Extension> QRead<PropStat<E>> for PropStat<E> {
+    async fn qread(xml: &mut Reader<impl IRead>) -> Result<Self, ParsingError> {
+        xml.open(DAV_URN, "propstat").await?;
+
+        let (mut m_any_prop, mut m_status, mut error, mut responsedescription) =
+            (None, None, None, None);
+
+        loop {
+            let mut dirty = false;
+            xml.maybe_read::<AnyProp<E>>(&mut m_any_prop, &mut dirty)
+                .await?;
+            xml.maybe_read::<Status>(&mut m_status, &mut dirty).await?;
+            xml.maybe_read::<Error<E>>(&mut error, &mut dirty).await?;
+            xml.maybe_read::<ResponseDescription>(&mut responsedescription, &mut dirty)
+                .await?;
+
+            if !dirty {
+                match xml.peek() {
+                    Event::End(_) => break,
+                    _ => xml.skip().await?,
+                };
+            }
+        }
+
+        xml.close().await?;
+        match (m_any_prop, m_status) {
+            (Some(prop), Some(status)) => Ok(PropStat {
+                prop,
+                status,
+                error,
+                responsedescription,
+            }),
+            _ => Err(ParsingError::MissingChild),
+        }
+    }
+}
+
+impl QRead<Status> for Status {
+    async fn qread(xml: &mut Reader<impl IRead>) -> Result<Self, ParsingError> {
+        xml.open(DAV_URN, "status").await?;
+        let fullcode = xml.tag_string().await?;
+        let txtcode = fullcode
+            .splitn(3, ' ')
+            .nth(1)
+            .ok_or(ParsingError::InvalidValue)?;
+        let code = http::status::StatusCode::from_bytes(txtcode.as_bytes())
+            .or(Err(ParsingError::InvalidValue))?;
+        xml.close().await?;
+        Ok(Status(code))
+    }
+}
+
+impl QRead<ResponseDescription> for ResponseDescription {
+    async fn qread(xml: &mut Reader<impl IRead>) -> Result<Self, ParsingError> {
+        xml.open(DAV_URN, "responsedescription").await?;
+        let cnt = xml.tag_string().await?;
+        xml.close().await?;
+        Ok(ResponseDescription(cnt))
+    }
+}
+
+impl QRead<Location> for Location {
+    async fn qread(xml: &mut Reader<impl IRead>) -> Result<Self, ParsingError> {
+        xml.open(DAV_URN, "location").await?;
+        let href = xml.find::<Href>().await?;
+        xml.close().await?;
+        Ok(Location(href))
+    }
+}
+
+impl<E: Extension> QRead<PropertyUpdateItem<E>> for PropertyUpdateItem<E> {
+    async fn qread(xml: &mut Reader<impl IRead>) -> Result<Self, ParsingError> {
+        match Remove::qread(xml).await {
+            Err(ParsingError::Recoverable) => (),
+            otherwise => return otherwise.map(PropertyUpdateItem::Remove),
+        }
+        Set::qread(xml).await.map(PropertyUpdateItem::Set)
+    }
+}
+
+impl<E: Extension> QRead<Remove<E>> for Remove<E> {
+    async fn qread(xml: &mut Reader<impl IRead>) -> Result<Self, ParsingError> {
+        xml.open(DAV_URN, "remove").await?;
+        let propname = xml.find::<PropName<E>>().await?;
+        xml.close().await?;
+        Ok(Remove(propname))
+    }
+}
+
+impl<E: Extension> QRead<Set<E>> for Set<E> {
+    async fn qread(xml: &mut Reader<impl IRead>) -> Result<Self, ParsingError> {
+        xml.open(DAV_URN, "set").await?;
+        let propvalue = xml.find::<PropValue<E>>().await?;
+        xml.close().await?;
+        Ok(Set(propvalue))
+    }
+}
+
+impl<E: Extension> QRead<Violation<E>> for Violation<E> {
+    async fn qread(xml: &mut Reader<impl IRead>) -> Result<Self, ParsingError> {
+        if xml
+            .maybe_open(DAV_URN, "lock-token-matches-request-uri")
+            .await?
+            .is_some()
+        {
+            xml.close().await?;
+            Ok(Violation::LockTokenMatchesRequestUri)
+        } else if xml
+            .maybe_open(DAV_URN, "lock-token-submitted")
+            .await?
+            .is_some()
+        {
+            let links = xml.collect::<Href>().await?;
+            xml.close().await?;
+            Ok(Violation::LockTokenSubmitted(links))
+        } else if xml
+            .maybe_open(DAV_URN, "no-conflicting-lock")
+            .await?
+            .is_some()
+        {
+            let links = xml.collect::<Href>().await?;
+            xml.close().await?;
+            Ok(Violation::NoConflictingLock(links))
+        } else if xml
+            .maybe_open(DAV_URN, "no-external-entities")
+            .await?
+            .is_some()
+        {
+            xml.close().await?;
+            Ok(Violation::NoExternalEntities)
+        } else if xml
+            .maybe_open(DAV_URN, "preserved-live-properties")
+            .await?
+            .is_some()
+        {
+            xml.close().await?;
+            Ok(Violation::PreservedLiveProperties)
+        } else if xml
+            .maybe_open(DAV_URN, "propfind-finite-depth")
+            .await?
+            .is_some()
+        {
+            xml.close().await?;
+            Ok(Violation::PropfindFiniteDepth)
+        } else if xml
+            .maybe_open(DAV_URN, "cannot-modify-protected-property")
+            .await?
+            .is_some()
+        {
+            xml.close().await?;
+            Ok(Violation::CannotModifyProtectedProperty)
+        } else {
+            E::Error::qread(xml).await.map(Violation::Extension)
+        }
+    }
+}
+
+impl<E: Extension> QRead<Include<E>> for Include<E> {
+    async fn qread(xml: &mut Reader<impl IRead>) -> Result<Self, ParsingError> {
+        xml.open(DAV_URN, "include").await?;
+        let acc = xml.collect::<PropertyRequest<E>>().await?;
+        xml.close().await?;
+        Ok(Include(acc))
+    }
+}
+
+impl<E: Extension> QRead<PropName<E>> for PropName<E> {
+    async fn qread(xml: &mut Reader<impl IRead>) -> Result<Self, ParsingError> {
+        xml.open(DAV_URN, "prop").await?;
+        let acc = xml.collect::<PropertyRequest<E>>().await?;
+        xml.close().await?;
+        Ok(PropName(acc))
+    }
+}
+
+impl<E: Extension> QRead<AnyProp<E>> for AnyProp<E> {
+    async fn qread(xml: &mut Reader<impl IRead>) -> Result<Self, ParsingError> {
+        xml.open(DAV_URN, "prop").await?;
+        let acc = xml.collect::<AnyProperty<E>>().await?;
+        xml.close().await?;
+        Ok(AnyProp(acc))
+    }
+}
+
+impl<E: Extension> QRead<AnyProperty<E>> for AnyProperty<E> {
+    async fn qread(xml: &mut Reader<impl IRead>) -> Result<Self, ParsingError> {
+        match Property::qread(xml).await {
+            Err(ParsingError::Recoverable) => (),
+            otherwise => return otherwise.map(Self::Value),
+        }
+        PropertyRequest::qread(xml).await.map(Self::Request)
+    }
+}
+
+impl<E: Extension> QRead<PropertyRequest<E>> for PropertyRequest<E> {
+    async fn qread(xml: &mut Reader<impl IRead>) -> Result<Self, ParsingError> {
+        let maybe = if xml.maybe_open(DAV_URN, "creationdate").await?.is_some() {
+            Some(PropertyRequest::CreationDate)
+        } else if xml.maybe_open(DAV_URN, "displayname").await?.is_some() {
+            Some(PropertyRequest::DisplayName)
+        } else if xml
+            .maybe_open(DAV_URN, "getcontentlanguage")
+            .await?
+            .is_some()
+        {
+            Some(PropertyRequest::GetContentLanguage)
+        } else if xml.maybe_open(DAV_URN, "getcontentlength").await?.is_some() {
+            Some(PropertyRequest::GetContentLength)
+        } else if xml.maybe_open(DAV_URN, "getcontenttype").await?.is_some() {
+            Some(PropertyRequest::GetContentType)
+        } else if xml.maybe_open(DAV_URN, "getetag").await?.is_some() {
+            Some(PropertyRequest::GetEtag)
+        } else if xml.maybe_open(DAV_URN, "getlastmodified").await?.is_some() {
+            Some(PropertyRequest::GetLastModified)
+        } else if xml.maybe_open(DAV_URN, "lockdiscovery").await?.is_some() {
+            Some(PropertyRequest::LockDiscovery)
+        } else if xml.maybe_open(DAV_URN, "resourcetype").await?.is_some() {
+            Some(PropertyRequest::ResourceType)
+        } else if xml.maybe_open(DAV_URN, "supportedlock").await?.is_some() {
+            Some(PropertyRequest::SupportedLock)
+        } else {
+            None
+        };
+
+        match maybe {
+            Some(pr) => {
+                xml.close().await?;
+                Ok(pr)
+            }
+            None => E::PropertyRequest::qread(xml)
+                .await
+                .map(PropertyRequest::Extension),
+        }
+    }
+}
+
+impl<E: Extension> QRead<Property<E>> for Property<E> {
+    async fn qread(xml: &mut Reader<impl IRead>) -> Result<Self, ParsingError> {
+        // Core WebDAV properties
+        if xml
+            .maybe_open_start(DAV_URN, "creationdate")
+            .await?
+            .is_some()
+        {
+            let datestr = xml.tag_string().await?;
+            xml.close().await?;
+            return Ok(Property::CreationDate(DateTime::parse_from_rfc3339(
+                datestr.as_str(),
+            )?));
+        } else if xml
+            .maybe_open_start(DAV_URN, "displayname")
+            .await?
+            .is_some()
+        {
+            let name = xml.tag_string().await?;
+            xml.close().await?;
+            return Ok(Property::DisplayName(name));
+        } else if xml
+            .maybe_open_start(DAV_URN, "getcontentlanguage")
+            .await?
+            .is_some()
+        {
+            let lang = xml.tag_string().await?;
+            xml.close().await?;
+            return Ok(Property::GetContentLanguage(lang));
+        } else if xml
+            .maybe_open_start(DAV_URN, "getcontentlength")
+            .await?
+            .is_some()
+        {
+            let cl = xml.tag_string().await?.parse::<u64>()?;
+            xml.close().await?;
+            return Ok(Property::GetContentLength(cl));
+        } else if xml
+            .maybe_open_start(DAV_URN, "getcontenttype")
+            .await?
+            .is_some()
+        {
+            let ct = xml.tag_string().await?;
+            xml.close().await?;
+            return Ok(Property::GetContentType(ct));
+        } else if xml.maybe_open_start(DAV_URN, "getetag").await?.is_some() {
+            let etag = xml.tag_string().await?;
+            xml.close().await?;
+            return Ok(Property::GetEtag(etag));
+        } else if xml
+            .maybe_open_start(DAV_URN, "getlastmodified")
+            .await?
+            .is_some()
+        {
+            let datestr = xml.tag_string().await?;
+            xml.close().await?;
+            return Ok(Property::GetLastModified(DateTime::parse_from_rfc2822(
+                datestr.as_str(),
+            )?));
+        } else if xml
+            .maybe_open_start(DAV_URN, "lockdiscovery")
+            .await?
+            .is_some()
+        {
+            let acc = xml.collect::<ActiveLock>().await?;
+            xml.close().await?;
+            return Ok(Property::LockDiscovery(acc));
+        } else if xml
+            .maybe_open_start(DAV_URN, "resourcetype")
+            .await?
+            .is_some()
+        {
+            let acc = xml.collect::<ResourceType<E>>().await?;
+            xml.close().await?;
+            return Ok(Property::ResourceType(acc));
+        } else if xml
+            .maybe_open_start(DAV_URN, "supportedlock")
+            .await?
+            .is_some()
+        {
+            let acc = xml.collect::<LockEntry>().await?;
+            xml.close().await?;
+            return Ok(Property::SupportedLock(acc));
+        }
+
+        // Option 2: an extension property, delegating
+        E::Property::qread(xml).await.map(Property::Extension)
+    }
+}
+
+impl QRead<ActiveLock> for ActiveLock {
+    async fn qread(xml: &mut Reader<impl IRead>) -> Result<Self, ParsingError> {
+        xml.open(DAV_URN, "activelock").await?;
+        let (
+            mut m_scope,
+            mut m_type,
+            mut m_depth,
+            mut owner,
+            mut timeout,
+            mut locktoken,
+            mut m_root,
+        ) = (None, None, None, None, None, None, None);
+
+        loop {
+            let mut dirty = false;
+            xml.maybe_read::<LockScope>(&mut m_scope, &mut dirty)
+                .await?;
+            xml.maybe_read::<LockType>(&mut m_type, &mut dirty).await?;
+            xml.maybe_read::<Depth>(&mut m_depth, &mut dirty).await?;
+            xml.maybe_read::<Owner>(&mut owner, &mut dirty).await?;
+            xml.maybe_read::<Timeout>(&mut timeout, &mut dirty).await?;
+            xml.maybe_read::<LockToken>(&mut locktoken, &mut dirty)
+                .await?;
+            xml.maybe_read::<LockRoot>(&mut m_root, &mut dirty).await?;
+
+            if !dirty {
+                match xml.peek() {
+                    Event::End(_) => break,
+                    _ => {
+                        xml.skip().await?;
+                    }
+                }
+            }
+        }
+
+        xml.close().await?;
+        match (m_scope, m_type, m_depth, m_root) {
+            (Some(lockscope), Some(locktype), Some(depth), Some(lockroot)) => Ok(ActiveLock {
+                lockscope,
+                locktype,
+                depth,
+                owner,
+                timeout,
+                locktoken,
+                lockroot,
+            }),
+            _ => Err(ParsingError::MissingChild),
+        }
+    }
+}
+
+impl QRead<Depth> for Depth {
+    async fn qread(xml: &mut Reader<impl IRead>) -> Result<Self, ParsingError> {
+        xml.open(DAV_URN, "depth").await?;
+        let depth_str = xml.tag_string().await?;
+        xml.close().await?;
+        match depth_str.as_str() {
+            "0" => Ok(Depth::Zero),
+            "1" => Ok(Depth::One),
+            "infinity" => Ok(Depth::Infinity),
+            _ => Err(ParsingError::WrongToken),
+        }
+    }
+}
+
+impl QRead<Owner> for Owner {
+    async fn qread(xml: &mut Reader<impl IRead>) -> Result<Self, ParsingError> {
+        xml.open(DAV_URN, "owner").await?;
+
+        let mut owner = Owner::Unknown;
+        loop {
+            match xml.peek() {
+                Event::Text(_) | Event::CData(_) => {
+                    let txt = xml.tag_string().await?;
+                    if matches!(owner, Owner::Unknown) {
+                        owner = Owner::Txt(txt);
+                    }
+                }
+                Event::Start(_) | Event::Empty(_) => match Href::qread(xml).await {
+                    Ok(href) => {
+                        owner = Owner::Href(href);
+                    }
+                    Err(ParsingError::Recoverable) => {
+                        xml.skip().await?;
+                    }
+                    Err(e) => return Err(e),
+                },
+                Event::End(_) => break,
+                _ => {
+                    xml.skip().await?;
+                }
+            }
+        }
+        xml.close().await?;
+        Ok(owner)
+    }
+}
+
+impl QRead<Timeout> for Timeout {
+    async fn qread(xml: &mut Reader<impl IRead>) -> Result<Self, ParsingError> {
+        const SEC_PFX: &str = "Second-";
+        xml.open(DAV_URN, "timeout").await?;
+
+        let timeout = match xml.tag_string().await?.as_str() {
+            "Infinite" => Timeout::Infinite,
+            seconds => match seconds.strip_prefix(SEC_PFX) {
+                Some(secs) => Timeout::Seconds(secs.parse::<u32>()?),
+                None => return Err(ParsingError::InvalidValue),
+            },
+        };
+
+        xml.close().await?;
+        Ok(timeout)
+    }
+}
+
+impl QRead<LockToken> for LockToken {
+    async fn qread(xml: &mut Reader<impl IRead>) -> Result<Self, ParsingError> {
+        xml.open(DAV_URN, "locktoken").await?;
+        let href = xml.find::<Href>().await?;
+        xml.close().await?;
+        Ok(LockToken(href))
+    }
+}
+
+impl QRead<LockRoot> for LockRoot {
+    async fn qread(xml: &mut Reader<impl IRead>) -> Result<Self, ParsingError> {
+        xml.open(DAV_URN, "lockroot").await?;
+        let href = xml.find::<Href>().await?;
+        xml.close().await?;
+        Ok(LockRoot(href))
+    }
+}
+
+impl<E: Extension> QRead<ResourceType<E>> for ResourceType<E> {
+    async fn qread(xml: &mut Reader<impl IRead>) -> Result<Self, ParsingError> {
+        if xml.maybe_open(DAV_URN, "collection").await?.is_some() {
+            xml.close().await?;
+            return Ok(ResourceType::Collection);
+        }
+
+        E::ResourceType::qread(xml)
+            .await
+            .map(ResourceType::Extension)
+    }
+}
+
+impl QRead<LockEntry> for LockEntry {
+    async fn qread(xml: &mut Reader<impl IRead>) -> Result<Self, ParsingError> {
+        xml.open(DAV_URN, "lockentry").await?;
+        let (mut maybe_scope, mut maybe_type) = (None, None);
+
+        loop {
+            let mut dirty = false;
+            xml.maybe_read::<LockScope>(&mut maybe_scope, &mut dirty)
+                .await?;
+            xml.maybe_read::<LockType>(&mut maybe_type, &mut dirty)
+                .await?;
+            if !dirty {
+                match xml.peek() {
+                    Event::End(_) => break,
+                    _ => xml.skip().await?,
+                };
+            }
+        }
+
+        xml.close().await?;
+        match (maybe_scope, maybe_type) {
+            (Some(lockscope), Some(locktype)) => Ok(LockEntry {
+                lockscope,
+                locktype,
+            }),
+            _ => Err(ParsingError::MissingChild),
+        }
+    }
+}
+
+impl QRead<LockScope> for LockScope {
+    async fn qread(xml: &mut Reader<impl IRead>) -> Result<Self, ParsingError> {
+        xml.open(DAV_URN, "lockscope").await?;
+
+        let lockscope = loop {
+            if xml.maybe_open(DAV_URN, "exclusive").await?.is_some() {
+                xml.close().await?;
+                break LockScope::Exclusive;
+            }
+
+            if xml.maybe_open(DAV_URN, "shared").await?.is_some() {
+                xml.close().await?;
+                break LockScope::Shared;
+            }
+
+            xml.skip().await?;
+        };
+
+        xml.close().await?;
+        Ok(lockscope)
+    }
+}
+
+impl QRead<LockType> for LockType {
+    async fn qread(xml: &mut Reader<impl IRead>) -> Result<Self, ParsingError> {
+        xml.open(DAV_URN, "locktype").await?;
+
+        let locktype = loop {
+            if xml.maybe_open(DAV_URN, "write").await?.is_some() {
+                xml.close().await?;
+                break LockType::Write;
+            }
+
+            xml.skip().await?;
+        };
+
+        xml.close().await?;
+        Ok(locktype)
+    }
+}
+
+impl QRead<Href> for Href {
+    async fn qread(xml: &mut Reader<impl IRead>) -> Result<Self, ParsingError> {
+        xml.open(DAV_URN, "href").await?;
+        let url = xml.tag_string().await?;
+        xml.close().await?;
+        Ok(Href(url))
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::realization::Core;
+    use chrono::{FixedOffset, TimeZone};
+    use quick_xml::reader::NsReader;
+
+    #[tokio::test]
+    async fn basic_propfind_propname() {
+        let src = r#"<?xml version="1.0" encoding="utf-8" ?>
+<rando/>
+<garbage><old/></garbage>
+<D:propfind xmlns:D="DAV:">
+    <D:propname/>
+</D:propfind>
+"#;
+
+        let mut rdr = Reader::new(NsReader::from_reader(src.as_bytes()))
+            .await
+            .unwrap();
+        let got = rdr.find::<PropFind<Core>>().await.unwrap();
+
+        assert_eq!(got, PropFind::<Core>::PropName);
+    }
+
+    #[tokio::test]
+    async fn basic_propfind_prop() {
+        let src = r#"<?xml version="1.0" encoding="utf-8" ?>
+<rando/>
+<garbage><old/></garbage>
+<D:propfind xmlns:D="DAV:">
+    <D:prop>
+        <D:displayname/>
+        <D:getcontentlength/>
+        <D:getcontenttype/>
+        <D:getetag/>
+        <D:getlastmodified/>
+        <D:resourcetype/>
+        <D:supportedlock/>
+    </D:prop>
+</D:propfind>
+"#;
+
+        let mut rdr = Reader::new(NsReader::from_reader(src.as_bytes()))
+            .await
+            .unwrap();
+        let got = rdr.find::<PropFind<Core>>().await.unwrap();
+
+        assert_eq!(
+            got,
+            PropFind::Prop(PropName(vec![
+                PropertyRequest::DisplayName,
+                PropertyRequest::GetContentLength,
+                PropertyRequest::GetContentType,
+                PropertyRequest::GetEtag,
+                PropertyRequest::GetLastModified,
+                PropertyRequest::ResourceType,
+                PropertyRequest::SupportedLock,
+            ]))
+        );
+    }
+
+    #[tokio::test]
+    async fn rfc_lock_error() {
+        let src = r#"<?xml version="1.0" encoding="utf-8" ?>
+     <D:error xmlns:D="DAV:">
+       <D:lock-token-submitted>
+         <D:href>/locked/</D:href>
+       </D:lock-token-submitted>
+     </D:error>"#;
+
+        let mut rdr = Reader::new(NsReader::from_reader(src.as_bytes()))
+            .await
+            .unwrap();
+        let got = rdr.find::<Error<Core>>().await.unwrap();
+
+        assert_eq!(
+            got,
+            Error(vec![Violation::LockTokenSubmitted(vec![Href(
+                "/locked/".into()
+            )])])
+        );
+    }
+
+    #[tokio::test]
+    async fn rfc_propertyupdate() {
+        let src = r#"<?xml version="1.0" encoding="utf-8" ?>
+     <D:propertyupdate xmlns:D="DAV:"
+             xmlns:Z="http://ns.example.com/standards/z39.50/">
+       <D:set>
+         <D:prop>
+           <Z:Authors>
+             <Z:Author>Jim Whitehead</Z:Author>
+             <Z:Author>Roy Fielding</Z:Author>
+           </Z:Authors>
+         </D:prop>
+       </D:set>
+       <D:remove>
+         <D:prop><Z:Copyright-Owner/></D:prop>
+       </D:remove>
+     </D:propertyupdate>"#;
+
+        let mut rdr = Reader::new(NsReader::from_reader(src.as_bytes()))
+            .await
+            .unwrap();
+        let got = rdr.find::<PropertyUpdate<Core>>().await.unwrap();
+
+        assert_eq!(
+            got,
+            PropertyUpdate(vec![
+                PropertyUpdateItem::Set(Set(PropValue(vec![]))),
+                PropertyUpdateItem::Remove(Remove(PropName(vec![]))),
+            ])
+        );
+    }
+
+    #[tokio::test]
+    async fn rfc_lockinfo() {
+        let src = r#"
+<?xml version="1.0" encoding="utf-8" ?>
+<D:lockinfo xmlns:D='DAV:'>
+    <D:lockscope><D:exclusive/></D:lockscope>
+    <D:locktype><D:write/></D:locktype>
+    <D:owner>
+        <D:href>http://example.org/~ejw/contact.html</D:href>
+    </D:owner>
+</D:lockinfo>
+"#;
+
+        let mut rdr = Reader::new(NsReader::from_reader(src.as_bytes()))
+            .await
+            .unwrap();
+        let got = rdr.find::<LockInfo>().await.unwrap();
+
+        assert_eq!(
+            got,
+            LockInfo {
+                lockscope: LockScope::Exclusive,
+                locktype: LockType::Write,
+                owner: Some(Owner::Href(Href(
+                    "http://example.org/~ejw/contact.html".into()
+                ))),
+            }
+        );
+    }
+
+    #[tokio::test]
+    async fn rfc_multistatus_name() {
+        let src = r#"
+<?xml version="1.0" encoding="utf-8" ?>
+    <multistatus xmlns="DAV:">
+       <response>
+         <href>http://www.example.com/container/</href>
+         <propstat>
+           <prop xmlns:R="http://ns.example.com/boxschema/">
+             <R:bigbox/>
+             <R:author/>
+             <creationdate/>
+             <displayname/>
+             <resourcetype/>
+             <supportedlock/>
+           </prop>
+           <status>HTTP/1.1 200 OK</status>
+         </propstat>
+       </response>
+       <response>
+         <href>http://www.example.com/container/front.html</href>
+         <propstat>
+           <prop xmlns:R="http://ns.example.com/boxschema/">
+             <R:bigbox/>
+             <creationdate/>
+             <displayname/>
+             <getcontentlength/>
+             <getcontenttype/>
+             <getetag/>
+             <getlastmodified/>
+             <resourcetype/>
+             <supportedlock/>
+           </prop>
+           <status>HTTP/1.1 200 OK</status>
+         </propstat>
+       </response>
+     </multistatus>
+"#;
+
+        let mut rdr = Reader::new(NsReader::from_reader(src.as_bytes()))
+            .await
+            .unwrap();
+        let got = rdr.find::<Multistatus<Core>>().await.unwrap();
+
+        assert_eq!(
+            got,
+            Multistatus {
+                responses: vec![
+                    Response {
+                        status_or_propstat: StatusOrPropstat::PropStat(
+                            Href("http://www.example.com/container/".into()),
+                            vec![PropStat {
+                                prop: AnyProp(vec![
+                                    AnyProperty::Request(PropertyRequest::CreationDate),
+                                    AnyProperty::Request(PropertyRequest::DisplayName),
+                                    AnyProperty::Request(PropertyRequest::ResourceType),
+                                    AnyProperty::Request(PropertyRequest::SupportedLock),
+                                ]),
+                                status: Status(http::status::StatusCode::OK),
+                                error: None,
+                                responsedescription: None,
+                            }],
+                        ),
+                        error: None,
+                        responsedescription: None,
+                        location: None,
+                    },
+                    Response {
+                        status_or_propstat: StatusOrPropstat::PropStat(
+                            Href("http://www.example.com/container/front.html".into()),
+                            vec![PropStat {
+                                prop: AnyProp(vec![
+                                    AnyProperty::Request(PropertyRequest::CreationDate),
+                                    AnyProperty::Request(PropertyRequest::DisplayName),
+                                    AnyProperty::Request(PropertyRequest::GetContentLength),
+                                    AnyProperty::Request(PropertyRequest::GetContentType),
+                                    AnyProperty::Request(PropertyRequest::GetEtag),
+                                    AnyProperty::Request(PropertyRequest::GetLastModified),
+                                    AnyProperty::Request(PropertyRequest::ResourceType),
+                                    AnyProperty::Request(PropertyRequest::SupportedLock),
+                                ]),
+                                status: Status(http::status::StatusCode::OK),
+                                error: None,
+                                responsedescription: None,
+                            }],
+                        ),
+                        error: None,
+                        responsedescription: None,
+                        location: None,
+                    },
+                ],
+                responsedescription: None,
+                extension: None,
+            }
+        );
+    }
+
+    #[tokio::test]
+    async fn rfc_multistatus_value() {
+        let src = r#"
+     <?xml version="1.0" encoding="utf-8" ?>
+     <D:multistatus xmlns:D="DAV:">
+       <D:response>
+         <D:href>/container/</D:href>
+         <D:propstat>
+           <D:prop xmlns:R="http://ns.example.com/boxschema/">
+             <R:bigbox><R:BoxType>Box type A</R:BoxType></R:bigbox>
+             <R:author><R:Name>Hadrian</R:Name></R:author>
+             <D:creationdate>1997-12-01T17:42:21-08:00</D:creationdate>
+             <D:displayname>Example collection</D:displayname>
+             <D:resourcetype><D:collection/></D:resourcetype>
+             <D:supportedlock>
+               <D:lockentry>
+                 <D:lockscope><D:exclusive/></D:lockscope>
+                 <D:locktype><D:write/></D:locktype>
+               </D:lockentry>
+               <D:lockentry>
+                 <D:lockscope><D:shared/></D:lockscope>
+                 <D:locktype><D:write/></D:locktype>
+               </D:lockentry>
+             </D:supportedlock>
+           </D:prop>
+           <D:status>HTTP/1.1 200 OK</D:status>
+         </D:propstat>
+       </D:response>
+       <D:response>
+         <D:href>/container/front.html</D:href>
+         <D:propstat>
+           <D:prop xmlns:R="http://ns.example.com/boxschema/">
+             <R:bigbox><R:BoxType>Box type B</R:BoxType>
+             </R:bigbox>
+             <D:creationdate>1997-12-01T18:27:21-08:00</D:creationdate>
+             <D:displayname>Example HTML resource</D:displayname>
+             <D:getcontentlength>4525</D:getcontentlength>
+             <D:getcontenttype>text/html</D:getcontenttype>
+             <D:getetag>"zzyzx"</D:getetag>
+             <D:getlastmodified
+               >Mon, 12 Jan 1998 09:25:56 GMT</D:getlastmodified>
+             <D:resourcetype/>
+             <D:supportedlock>
+               <D:lockentry>
+                 <D:lockscope><D:exclusive/></D:lockscope>
+                 <D:locktype><D:write/></D:locktype>
+               </D:lockentry>
+               <D:lockentry>
+                 <D:lockscope><D:shared/></D:lockscope>
+                 <D:locktype><D:write/></D:locktype>
+               </D:lockentry>
+             </D:supportedlock>
+           </D:prop>
+           <D:status>HTTP/1.1 200 OK</D:status>
+         </D:propstat>
+       </D:response>
+     </D:multistatus>"#;
+
+        let mut rdr = Reader::new(NsReader::from_reader(src.as_bytes()))
+            .await
+            .unwrap();
+        let got = rdr.find::<Multistatus<Core>>().await.unwrap();
+
+        assert_eq!(
+            got,
+            Multistatus {
+                extension: None,
+                responses: vec![
+                    Response {
+                        status_or_propstat: StatusOrPropstat::PropStat(
+                            Href("/container/".into()),
+                            vec![PropStat {
+                                prop: AnyProp(vec![
+                                    AnyProperty::Value(Property::CreationDate(
+                                        FixedOffset::west_opt(8 * 3600)
+                                            .unwrap()
+                                            .with_ymd_and_hms(1997, 12, 01, 17, 42, 21)
+                                            .unwrap()
+                                    )),
+                                    AnyProperty::Value(Property::DisplayName(
+                                        "Example collection".into()
+                                    )),
+                                    AnyProperty::Value(Property::ResourceType(vec![
+                                        ResourceType::Collection
+                                    ])),
+                                    AnyProperty::Value(Property::SupportedLock(vec![
+                                        LockEntry {
+                                            lockscope: LockScope::Exclusive,
+                                            locktype: LockType::Write,
+                                        },
+                                        LockEntry {
+                                            lockscope: LockScope::Shared,
+                                            locktype: LockType::Write,
+                                        },
+                                    ])),
+                                ]),
+                                status: Status(http::status::StatusCode::OK),
+                                error: None,
+                                responsedescription: None,
+                            }],
+                        ),
+                        error: None,
+                        responsedescription: None,
+                        location: None,
+                    },
+                    Response {
+                        status_or_propstat: StatusOrPropstat::PropStat(
+                            Href("/container/front.html".into()),
+                            vec![PropStat {
+                                prop: AnyProp(vec![
+                                    AnyProperty::Value(Property::CreationDate(
+                                        FixedOffset::west_opt(8 * 3600)
+                                            .unwrap()
+                                            .with_ymd_and_hms(1997, 12, 01, 18, 27, 21)
+                                            .unwrap()
+                                    )),
+                                    AnyProperty::Value(Property::DisplayName(
+                                        "Example HTML resource".into()
+                                    )),
+                                    AnyProperty::Value(Property::GetContentLength(4525)),
+                                    AnyProperty::Value(Property::GetContentType(
+                                        "text/html".into()
+                                    )),
+                                    AnyProperty::Value(Property::GetEtag(r#""zzyzx""#.into())),
+                                    AnyProperty::Value(Property::GetLastModified(
+                                        FixedOffset::west_opt(0)
+                                            .unwrap()
+                                            .with_ymd_and_hms(1998, 01, 12, 09, 25, 56)
+                                            .unwrap()
+                                    )),
+                                    //@FIXME know bug, can't disambiguate between an empty resource
+                                    //type value and a request resource type
+                                    AnyProperty::Request(PropertyRequest::ResourceType),
+                                    AnyProperty::Value(Property::SupportedLock(vec![
+                                        LockEntry {
+                                            lockscope: LockScope::Exclusive,
+                                            locktype: LockType::Write,
+                                        },
+                                        LockEntry {
+                                            lockscope: LockScope::Shared,
+                                            locktype: LockType::Write,
+                                        },
+                                    ])),
+                                ]),
+                                status: Status(http::status::StatusCode::OK),
+                                error: None,
+                                responsedescription: None,
+                            }],
+                        ),
+                        error: None,
+                        responsedescription: None,
+                        location: None,
+                    },
+                ],
+                responsedescription: None,
+            }
+        );
+    }
+}
diff --git a/aero-dav/src/encoder.rs b/aero-dav/src/encoder.rs
new file mode 100644
index 0000000..6c77aa6
--- /dev/null
+++ b/aero-dav/src/encoder.rs
@@ -0,0 +1,1262 @@
+use super::types::*;
+use super::xml::{IWrite, Node, QWrite, Writer};
+use quick_xml::events::{BytesText, Event};
+use quick_xml::Error as QError;
+
+// --- XML ROOTS
+
+/// PROPFIND REQUEST
+impl<E: Extension> QWrite for PropFind<E> {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        let start = xml.create_dav_element("propfind");
+        let end = start.to_end();
+
+        xml.q.write_event_async(Event::Start(start.clone())).await?;
+        match self {
+            Self::PropName => {
+                let empty_propname = xml.create_dav_element("propname");
+                xml.q
+                    .write_event_async(Event::Empty(empty_propname))
+                    .await?
+            }
+            Self::AllProp(maybe_include) => {
+                let empty_allprop = xml.create_dav_element("allprop");
+                xml.q.write_event_async(Event::Empty(empty_allprop)).await?;
+                if let Some(include) = maybe_include {
+                    include.qwrite(xml).await?;
+                }
+            }
+            Self::Prop(propname) => propname.qwrite(xml).await?,
+        }
+        xml.q.write_event_async(Event::End(end)).await
+    }
+}
+
+/// PROPPATCH REQUEST
+impl<E: Extension> QWrite for PropertyUpdate<E> {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        let start = xml.create_dav_element("propertyupdate");
+        let end = start.to_end();
+
+        xml.q.write_event_async(Event::Start(start.clone())).await?;
+        for update in self.0.iter() {
+            update.qwrite(xml).await?;
+        }
+        xml.q.write_event_async(Event::End(end)).await
+    }
+}
+
+/// PROPFIND RESPONSE, PROPPATCH RESPONSE, COPY RESPONSE, MOVE RESPONSE
+/// DELETE RESPONSE,
+impl<E: Extension> QWrite for Multistatus<E> {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        let start = xml.create_dav_element("multistatus");
+        let end = start.to_end();
+
+        xml.q.write_event_async(Event::Start(start.clone())).await?;
+        for response in self.responses.iter() {
+            response.qwrite(xml).await?;
+        }
+        if let Some(description) = &self.responsedescription {
+            description.qwrite(xml).await?;
+        }
+        if let Some(extension) = &self.extension {
+            extension.qwrite(xml).await?;
+        }
+
+        xml.q.write_event_async(Event::End(end)).await?;
+        Ok(())
+    }
+}
+
+/// LOCK REQUEST
+impl QWrite for LockInfo {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        let start = xml.create_dav_element("lockinfo");
+        let end = start.to_end();
+
+        xml.q.write_event_async(Event::Start(start.clone())).await?;
+        self.lockscope.qwrite(xml).await?;
+        self.locktype.qwrite(xml).await?;
+        if let Some(owner) = &self.owner {
+            owner.qwrite(xml).await?;
+        }
+        xml.q.write_event_async(Event::End(end)).await
+    }
+}
+
+/// SOME LOCK RESPONSES
+impl<E: Extension> QWrite for PropValue<E> {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        let start = xml.create_dav_element("prop");
+        let end = start.to_end();
+
+        xml.q.write_event_async(Event::Start(start.clone())).await?;
+        for propval in &self.0 {
+            propval.qwrite(xml).await?;
+        }
+        xml.q.write_event_async(Event::End(end)).await
+    }
+}
+
+/// Error response
+impl<E: Extension> QWrite for Error<E> {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        let start = xml.create_dav_element("error");
+        let end = start.to_end();
+
+        xml.q.write_event_async(Event::Start(start.clone())).await?;
+        for violation in &self.0 {
+            violation.qwrite(xml).await?;
+        }
+        xml.q.write_event_async(Event::End(end)).await
+    }
+}
+
+// --- XML inner elements
+impl<E: Extension> QWrite for PropertyUpdateItem<E> {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        match self {
+            Self::Set(set) => set.qwrite(xml).await,
+            Self::Remove(rm) => rm.qwrite(xml).await,
+        }
+    }
+}
+
+impl<E: Extension> QWrite for Set<E> {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        let start = xml.create_dav_element("set");
+        let end = start.to_end();
+        xml.q.write_event_async(Event::Start(start.clone())).await?;
+        self.0.qwrite(xml).await?;
+        xml.q.write_event_async(Event::End(end)).await
+    }
+}
+
+impl<E: Extension> QWrite for Remove<E> {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        let start = xml.create_dav_element("remove");
+        let end = start.to_end();
+        xml.q.write_event_async(Event::Start(start.clone())).await?;
+        self.0.qwrite(xml).await?;
+        xml.q.write_event_async(Event::End(end)).await
+    }
+}
+
+impl<E: Extension> QWrite for PropName<E> {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        let start = xml.create_dav_element("prop");
+        let end = start.to_end();
+
+        xml.q.write_event_async(Event::Start(start.clone())).await?;
+        for propname in &self.0 {
+            propname.qwrite(xml).await?;
+        }
+        xml.q.write_event_async(Event::End(end)).await
+    }
+}
+
+impl<E: Extension> QWrite for AnyProp<E> {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        let start = xml.create_dav_element("prop");
+        let end = start.to_end();
+
+        xml.q.write_event_async(Event::Start(start.clone())).await?;
+        for propname in &self.0 {
+            propname.qwrite(xml).await?;
+        }
+        xml.q.write_event_async(Event::End(end)).await
+    }
+}
+
+impl<E: Extension> QWrite for AnyProperty<E> {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        match self {
+            Self::Request(v) => v.qwrite(xml).await,
+            Self::Value(v) => v.qwrite(xml).await,
+        }
+    }
+}
+
+impl QWrite for Href {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        let start = xml.create_dav_element("href");
+        let end = start.to_end();
+
+        xml.q.write_event_async(Event::Start(start.clone())).await?;
+        xml.q
+            .write_event_async(Event::Text(BytesText::new(&self.0)))
+            .await?;
+        xml.q.write_event_async(Event::End(end)).await
+    }
+}
+
+impl<E: Extension> QWrite for Response<E> {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        let start = xml.create_dav_element("response");
+        let end = start.to_end();
+
+        xml.q.write_event_async(Event::Start(start.clone())).await?;
+        self.status_or_propstat.qwrite(xml).await?;
+        if let Some(error) = &self.error {
+            error.qwrite(xml).await?;
+        }
+        if let Some(responsedescription) = &self.responsedescription {
+            responsedescription.qwrite(xml).await?;
+        }
+        if let Some(location) = &self.location {
+            location.qwrite(xml).await?;
+        }
+        xml.q.write_event_async(Event::End(end)).await
+    }
+}
+
+impl<E: Extension> QWrite for StatusOrPropstat<E> {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        match self {
+            Self::Status(many_href, status) => {
+                for href in many_href.iter() {
+                    href.qwrite(xml).await?;
+                }
+                status.qwrite(xml).await
+            }
+            Self::PropStat(href, propstat_list) => {
+                href.qwrite(xml).await?;
+                for propstat in propstat_list.iter() {
+                    propstat.qwrite(xml).await?;
+                }
+                Ok(())
+            }
+        }
+    }
+}
+
+impl QWrite for Status {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        let start = xml.create_dav_element("status");
+        let end = start.to_end();
+
+        xml.q.write_event_async(Event::Start(start.clone())).await?;
+
+        let txt = format!(
+            "HTTP/1.1 {} {}",
+            self.0.as_str(),
+            self.0.canonical_reason().unwrap_or("No reason")
+        );
+        xml.q
+            .write_event_async(Event::Text(BytesText::new(&txt)))
+            .await?;
+
+        xml.q.write_event_async(Event::End(end)).await?;
+
+        Ok(())
+    }
+}
+
+impl QWrite for ResponseDescription {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        let start = xml.create_dav_element("responsedescription");
+        let end = start.to_end();
+
+        xml.q.write_event_async(Event::Start(start.clone())).await?;
+        xml.q
+            .write_event_async(Event::Text(BytesText::new(&self.0)))
+            .await?;
+        xml.q.write_event_async(Event::End(end)).await
+    }
+}
+
+impl QWrite for Location {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        let start = xml.create_dav_element("location");
+        let end = start.to_end();
+
+        xml.q.write_event_async(Event::Start(start.clone())).await?;
+        self.0.qwrite(xml).await?;
+        xml.q.write_event_async(Event::End(end)).await
+    }
+}
+
+impl<E: Extension> QWrite for PropStat<E> {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        let start = xml.create_dav_element("propstat");
+        let end = start.to_end();
+
+        xml.q.write_event_async(Event::Start(start.clone())).await?;
+        self.prop.qwrite(xml).await?;
+        self.status.qwrite(xml).await?;
+        if let Some(error) = &self.error {
+            error.qwrite(xml).await?;
+        }
+        if let Some(description) = &self.responsedescription {
+            description.qwrite(xml).await?;
+        }
+        xml.q.write_event_async(Event::End(end)).await?;
+
+        Ok(())
+    }
+}
+
+impl<E: Extension> QWrite for Property<E> {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        use Property::*;
+        match self {
+            CreationDate(date) => {
+                // <D:creationdate>1997-12-01T17:42:21-08:00</D:creationdate>
+                let start = xml.create_dav_element("creationdate");
+                let end = start.to_end();
+
+                xml.q.write_event_async(Event::Start(start.clone())).await?;
+                xml.q
+                    .write_event_async(Event::Text(BytesText::new(&date.to_rfc3339())))
+                    .await?;
+                xml.q.write_event_async(Event::End(end)).await?;
+            }
+            DisplayName(name) => {
+                // <D:displayname>Example collection</D:displayname>
+                let start = xml.create_dav_element("displayname");
+                let end = start.to_end();
+
+                xml.q.write_event_async(Event::Start(start.clone())).await?;
+                xml.q
+                    .write_event_async(Event::Text(BytesText::new(name)))
+                    .await?;
+                xml.q.write_event_async(Event::End(end)).await?;
+            }
+            GetContentLanguage(lang) => {
+                let start = xml.create_dav_element("getcontentlanguage");
+                let end = start.to_end();
+
+                xml.q.write_event_async(Event::Start(start.clone())).await?;
+                xml.q
+                    .write_event_async(Event::Text(BytesText::new(lang)))
+                    .await?;
+                xml.q.write_event_async(Event::End(end)).await?;
+            }
+            GetContentLength(len) => {
+                // <D:getcontentlength>4525</D:getcontentlength>
+                let start = xml.create_dav_element("getcontentlength");
+                let end = start.to_end();
+
+                xml.q.write_event_async(Event::Start(start.clone())).await?;
+                xml.q
+                    .write_event_async(Event::Text(BytesText::new(&len.to_string())))
+                    .await?;
+                xml.q.write_event_async(Event::End(end)).await?;
+            }
+            GetContentType(ct) => {
+                // <D:getcontenttype>text/html</D:getcontenttype>
+                let start = xml.create_dav_element("getcontenttype");
+                let end = start.to_end();
+
+                xml.q.write_event_async(Event::Start(start.clone())).await?;
+                xml.q
+                    .write_event_async(Event::Text(BytesText::new(&ct)))
+                    .await?;
+                xml.q.write_event_async(Event::End(end)).await?;
+            }
+            GetEtag(et) => {
+                // <D:getetag>"zzyzx"</D:getetag>
+                let start = xml.create_dav_element("getetag");
+                let end = start.to_end();
+
+                xml.q.write_event_async(Event::Start(start.clone())).await?;
+                xml.q
+                    .write_event_async(Event::Text(BytesText::new(et)))
+                    .await?;
+                xml.q.write_event_async(Event::End(end)).await?;
+            }
+            GetLastModified(date) => {
+                // <D:getlastmodified>Mon, 12 Jan 1998 09:25:56 GMT</D:getlastmodified>
+                let start = xml.create_dav_element("getlastmodified");
+                let end = start.to_end();
+
+                xml.q.write_event_async(Event::Start(start.clone())).await?;
+                xml.q
+                    .write_event_async(Event::Text(BytesText::new(&date.to_rfc2822())))
+                    .await?;
+                xml.q.write_event_async(Event::End(end)).await?;
+            }
+            LockDiscovery(many_locks) => {
+                // <D:lockdiscovery><D:activelock> ... </D:activelock></D:lockdiscovery>
+                let start = xml.create_dav_element("lockdiscovery");
+                let end = start.to_end();
+
+                xml.q.write_event_async(Event::Start(start.clone())).await?;
+                for lock in many_locks.iter() {
+                    lock.qwrite(xml).await?;
+                }
+                xml.q.write_event_async(Event::End(end)).await?;
+            }
+            ResourceType(many_types) => {
+                // <D:resourcetype><D:collection/></D:resourcetype>
+
+                // <D:resourcetype/>
+
+                // <x:resourcetype xmlns:x="DAV:">
+                //   <x:collection/>
+                //   <f:search-results xmlns:f="http://www.example.com/ns"/>
+                // </x:resourcetype>
+
+                let start = xml.create_dav_element("resourcetype");
+                if many_types.is_empty() {
+                    xml.q.write_event_async(Event::Empty(start)).await?;
+                } else {
+                    let end = start.to_end();
+                    xml.q.write_event_async(Event::Start(start.clone())).await?;
+                    for restype in many_types.iter() {
+                        restype.qwrite(xml).await?;
+                    }
+                    xml.q.write_event_async(Event::End(end)).await?;
+                }
+            }
+            SupportedLock(many_entries) => {
+                // <D:supportedlock/>
+
+                //  <D:supportedlock> <D:lockentry> ... </D:lockentry> </D:supportedlock>
+
+                let start = xml.create_dav_element("supportedlock");
+                if many_entries.is_empty() {
+                    xml.q.write_event_async(Event::Empty(start)).await?;
+                } else {
+                    let end = start.to_end();
+                    xml.q.write_event_async(Event::Start(start.clone())).await?;
+                    for entry in many_entries.iter() {
+                        entry.qwrite(xml).await?;
+                    }
+                    xml.q.write_event_async(Event::End(end)).await?;
+                }
+            }
+            Extension(inner) => inner.qwrite(xml).await?,
+        };
+        Ok(())
+    }
+}
+
+impl<E: Extension> QWrite for ResourceType<E> {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        match self {
+            Self::Collection => {
+                let empty_collection = xml.create_dav_element("collection");
+                xml.q
+                    .write_event_async(Event::Empty(empty_collection))
+                    .await
+            }
+            Self::Extension(inner) => inner.qwrite(xml).await,
+        }
+    }
+}
+
+impl<E: Extension> QWrite for Include<E> {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        let start = xml.create_dav_element("include");
+        let end = start.to_end();
+
+        xml.q.write_event_async(Event::Start(start.clone())).await?;
+        for prop in self.0.iter() {
+            prop.qwrite(xml).await?;
+        }
+        xml.q.write_event_async(Event::End(end)).await
+    }
+}
+
+impl<E: Extension> QWrite for PropertyRequest<E> {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        use PropertyRequest::*;
+        let mut atom = async |c| {
+            let empty_tag = xml.create_dav_element(c);
+            xml.q.write_event_async(Event::Empty(empty_tag)).await
+        };
+
+        match self {
+            CreationDate => atom("creationdate").await,
+            DisplayName => atom("displayname").await,
+            GetContentLanguage => atom("getcontentlanguage").await,
+            GetContentLength => atom("getcontentlength").await,
+            GetContentType => atom("getcontenttype").await,
+            GetEtag => atom("getetag").await,
+            GetLastModified => atom("getlastmodified").await,
+            LockDiscovery => atom("lockdiscovery").await,
+            ResourceType => atom("resourcetype").await,
+            SupportedLock => atom("supportedlock").await,
+            Extension(inner) => inner.qwrite(xml).await,
+        }
+    }
+}
+
+impl QWrite for ActiveLock {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        // <D:activelock>
+        //   <D:locktype><D:write/></D:locktype>
+        //   <D:lockscope><D:exclusive/></D:lockscope>
+        //   <D:depth>infinity</D:depth>
+        //   <D:owner>
+        //     <D:href>http://example.org/~ejw/contact.html</D:href>
+        //   </D:owner>
+        //   <D:timeout>Second-604800</D:timeout>
+        //   <D:locktoken>
+        //     <D:href>urn:uuid:e71d4fae-5dec-22d6-fea5-00a0c91e6be4</D:href>
+        //   </D:locktoken>
+        //   <D:lockroot>
+        //     <D:href>http://example.com/workspace/webdav/proposal.doc</D:href>
+        //   </D:lockroot>
+        // </D:activelock>
+        let start = xml.create_dav_element("activelock");
+        let end = start.to_end();
+
+        xml.q.write_event_async(Event::Start(start.clone())).await?;
+        self.locktype.qwrite(xml).await?;
+        self.lockscope.qwrite(xml).await?;
+        self.depth.qwrite(xml).await?;
+        if let Some(owner) = &self.owner {
+            owner.qwrite(xml).await?;
+        }
+        if let Some(timeout) = &self.timeout {
+            timeout.qwrite(xml).await?;
+        }
+        if let Some(locktoken) = &self.locktoken {
+            locktoken.qwrite(xml).await?;
+        }
+        self.lockroot.qwrite(xml).await?;
+        xml.q.write_event_async(Event::End(end)).await
+    }
+}
+
+impl QWrite for LockType {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        let start = xml.create_dav_element("locktype");
+        let end = start.to_end();
+
+        xml.q.write_event_async(Event::Start(start.clone())).await?;
+        match self {
+            Self::Write => {
+                let empty_write = xml.create_dav_element("write");
+                xml.q.write_event_async(Event::Empty(empty_write)).await?
+            }
+        };
+        xml.q.write_event_async(Event::End(end)).await
+    }
+}
+
+impl QWrite for LockScope {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        let start = xml.create_dav_element("lockscope");
+        let end = start.to_end();
+
+        xml.q.write_event_async(Event::Start(start.clone())).await?;
+        match self {
+            Self::Exclusive => {
+                let empty_tag = xml.create_dav_element("exclusive");
+                xml.q.write_event_async(Event::Empty(empty_tag)).await?
+            }
+            Self::Shared => {
+                let empty_tag = xml.create_dav_element("shared");
+                xml.q.write_event_async(Event::Empty(empty_tag)).await?
+            }
+        };
+        xml.q.write_event_async(Event::End(end)).await
+    }
+}
+
+impl QWrite for Owner {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        let start = xml.create_dav_element("owner");
+        let end = start.to_end();
+
+        xml.q.write_event_async(Event::Start(start.clone())).await?;
+        match self {
+            Self::Txt(txt) => {
+                xml.q
+                    .write_event_async(Event::Text(BytesText::new(&txt)))
+                    .await?
+            }
+            Self::Href(href) => href.qwrite(xml).await?,
+            Self::Unknown => (),
+        }
+        xml.q.write_event_async(Event::End(end)).await
+    }
+}
+
+impl QWrite for Depth {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        let start = xml.create_dav_element("depth");
+        let end = start.to_end();
+
+        xml.q.write_event_async(Event::Start(start.clone())).await?;
+        match self {
+            Self::Zero => {
+                xml.q
+                    .write_event_async(Event::Text(BytesText::new("0")))
+                    .await?
+            }
+            Self::One => {
+                xml.q
+                    .write_event_async(Event::Text(BytesText::new("1")))
+                    .await?
+            }
+            Self::Infinity => {
+                xml.q
+                    .write_event_async(Event::Text(BytesText::new("infinity")))
+                    .await?
+            }
+        };
+        xml.q.write_event_async(Event::End(end)).await
+    }
+}
+
+impl QWrite for Timeout {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        let start = xml.create_dav_element("timeout");
+        let end = start.to_end();
+
+        xml.q.write_event_async(Event::Start(start.clone())).await?;
+        match self {
+            Self::Seconds(count) => {
+                let txt = format!("Second-{}", count);
+                xml.q
+                    .write_event_async(Event::Text(BytesText::new(&txt)))
+                    .await?
+            }
+            Self::Infinite => {
+                xml.q
+                    .write_event_async(Event::Text(BytesText::new("Infinite")))
+                    .await?
+            }
+        };
+        xml.q.write_event_async(Event::End(end)).await
+    }
+}
+
+impl QWrite for LockToken {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        let start = xml.create_dav_element("locktoken");
+        let end = start.to_end();
+
+        xml.q.write_event_async(Event::Start(start.clone())).await?;
+        self.0.qwrite(xml).await?;
+        xml.q.write_event_async(Event::End(end)).await
+    }
+}
+
+impl QWrite for LockRoot {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        let start = xml.create_dav_element("lockroot");
+        let end = start.to_end();
+
+        xml.q.write_event_async(Event::Start(start.clone())).await?;
+        self.0.qwrite(xml).await?;
+        xml.q.write_event_async(Event::End(end)).await
+    }
+}
+
+impl QWrite for LockEntry {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        let start = xml.create_dav_element("lockentry");
+        let end = start.to_end();
+
+        xml.q.write_event_async(Event::Start(start.clone())).await?;
+        self.lockscope.qwrite(xml).await?;
+        self.locktype.qwrite(xml).await?;
+        xml.q.write_event_async(Event::End(end)).await
+    }
+}
+
+impl<E: Extension> QWrite for Violation<E> {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        let mut atom = async |c| {
+            let empty_tag = xml.create_dav_element(c);
+            xml.q.write_event_async(Event::Empty(empty_tag)).await
+        };
+
+        match self {
+            Violation::LockTokenMatchesRequestUri => atom("lock-token-matches-request-uri").await,
+            Violation::LockTokenSubmitted(hrefs) if hrefs.is_empty() => {
+                atom("lock-token-submitted").await
+            }
+            Violation::LockTokenSubmitted(hrefs) => {
+                let start = xml.create_dav_element("lock-token-submitted");
+                let end = start.to_end();
+
+                xml.q.write_event_async(Event::Start(start.clone())).await?;
+                for href in hrefs {
+                    href.qwrite(xml).await?;
+                }
+                xml.q.write_event_async(Event::End(end)).await
+            }
+            Violation::NoConflictingLock(hrefs) if hrefs.is_empty() => {
+                atom("no-conflicting-lock").await
+            }
+            Violation::NoConflictingLock(hrefs) => {
+                let start = xml.create_dav_element("no-conflicting-lock");
+                let end = start.to_end();
+
+                xml.q.write_event_async(Event::Start(start.clone())).await?;
+                for href in hrefs {
+                    href.qwrite(xml).await?;
+                }
+                xml.q.write_event_async(Event::End(end)).await
+            }
+            Violation::NoExternalEntities => atom("no-external-entities").await,
+            Violation::PreservedLiveProperties => atom("preserved-live-properties").await,
+            Violation::PropfindFiniteDepth => atom("propfind-finite-depth").await,
+            Violation::CannotModifyProtectedProperty => {
+                atom("cannot-modify-protected-property").await
+            }
+            Violation::Extension(inner) => inner.qwrite(xml).await,
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::super::xml;
+    use super::*;
+    use crate::realization::Core;
+    use tokio::io::AsyncWriteExt;
+
+    /// To run only the unit tests and avoid the behavior ones:
+    /// cargo test --bin aerogramme
+
+    async fn serialize(elem: &impl QWrite) -> String {
+        let mut buffer = Vec::new();
+        let mut tokio_buffer = tokio::io::BufWriter::new(&mut buffer);
+        let q = quick_xml::writer::Writer::new_with_indent(&mut tokio_buffer, b' ', 4);
+        let ns_to_apply = vec![("xmlns:D".into(), "DAV:".into())];
+        let mut writer = Writer { q, ns_to_apply };
+
+        elem.qwrite(&mut writer).await.expect("xml serialization");
+        tokio_buffer.flush().await.expect("tokio buffer flush");
+        let got = std::str::from_utf8(buffer.as_slice()).unwrap();
+
+        return got.into();
+    }
+
+    async fn deserialize<T: xml::Node<T>>(src: &str) -> T {
+        let mut rdr = xml::Reader::new(quick_xml::reader::NsReader::from_reader(src.as_bytes()))
+            .await
+            .unwrap();
+        rdr.find().await.unwrap()
+    }
+
+    #[tokio::test]
+    async fn basic_href() {
+        let orig = Href("/SOGo/dav/so/".into());
+
+        let got = serialize(&orig).await;
+        let expected = r#"<D:href xmlns:D="DAV:">/SOGo/dav/so/</D:href>"#;
+
+        assert_eq!(
+            &got, expected,
+            "\n---GOT---\n{got}\n---EXP---\n{expected}\n"
+        );
+        assert_eq!(deserialize::<Href>(got.as_str()).await, orig)
+    }
+
+    #[tokio::test]
+    async fn basic_multistatus() {
+        let orig = Multistatus::<Core> {
+            extension: None,
+            responses: vec![],
+            responsedescription: Some(ResponseDescription("Hello world".into())),
+        };
+        let got = serialize(&orig).await;
+
+        let expected = r#"<D:multistatus xmlns:D="DAV:">
+    <D:responsedescription>Hello world</D:responsedescription>
+</D:multistatus>"#;
+
+        assert_eq!(
+            &got, expected,
+            "\n---GOT---\n{got}\n---EXP---\n{expected}\n"
+        );
+        assert_eq!(deserialize::<Multistatus::<Core>>(got.as_str()).await, orig)
+    }
+
+    #[tokio::test]
+    async fn rfc_error_delete_locked() {
+        let orig = Error::<Core>(vec![Violation::LockTokenSubmitted(vec![Href(
+            "/locked/".into(),
+        )])]);
+        let got = serialize(&orig).await;
+
+        let expected = r#"<D:error xmlns:D="DAV:">
+    <D:lock-token-submitted>
+        <D:href>/locked/</D:href>
+    </D:lock-token-submitted>
+</D:error>"#;
+
+        assert_eq!(
+            &got, expected,
+            "\n---GOT---\n{got}\n---EXP---\n{expected}\n"
+        );
+        assert_eq!(deserialize::<Error<Core>>(got.as_str()).await, orig)
+    }
+
+    #[tokio::test]
+    async fn rfc_propname_req() {
+        let orig = PropFind::<Core>::PropName;
+
+        let got = serialize(&orig).await;
+
+        let expected = r#"<D:propfind xmlns:D="DAV:">
+    <D:propname/>
+</D:propfind>"#;
+
+        assert_eq!(
+            &got, expected,
+            "\n---GOT---\n{got}\n---EXP---\n{expected}\n"
+        );
+        assert_eq!(deserialize::<PropFind::<Core>>(got.as_str()).await, orig)
+    }
+
+    #[tokio::test]
+    async fn rfc_propname_res() {
+        let orig = Multistatus::<Core> {
+            extension: None,
+            responses: vec![
+                Response {
+                    status_or_propstat: StatusOrPropstat::PropStat(
+                        Href("http://www.example.com/container/".into()),
+                        vec![PropStat {
+                            prop: AnyProp(vec![
+                                AnyProperty::Request(PropertyRequest::CreationDate),
+                                AnyProperty::Request(PropertyRequest::DisplayName),
+                                AnyProperty::Request(PropertyRequest::ResourceType),
+                                AnyProperty::Request(PropertyRequest::SupportedLock),
+                            ]),
+                            status: Status(http::status::StatusCode::OK),
+                            error: None,
+                            responsedescription: None,
+                        }],
+                    ),
+                    error: None,
+                    responsedescription: None,
+                    location: None,
+                },
+                Response {
+                    status_or_propstat: StatusOrPropstat::PropStat(
+                        Href("http://www.example.com/container/front.html".into()),
+                        vec![PropStat {
+                            prop: AnyProp(vec![
+                                AnyProperty::Request(PropertyRequest::CreationDate),
+                                AnyProperty::Request(PropertyRequest::DisplayName),
+                                AnyProperty::Request(PropertyRequest::GetContentLength),
+                                AnyProperty::Request(PropertyRequest::GetContentType),
+                                AnyProperty::Request(PropertyRequest::GetEtag),
+                                AnyProperty::Request(PropertyRequest::GetLastModified),
+                                AnyProperty::Request(PropertyRequest::ResourceType),
+                                AnyProperty::Request(PropertyRequest::SupportedLock),
+                            ]),
+                            status: Status(http::status::StatusCode::OK),
+                            error: None,
+                            responsedescription: None,
+                        }],
+                    ),
+                    error: None,
+                    responsedescription: None,
+                    location: None,
+                },
+            ],
+            responsedescription: None,
+        };
+
+        let got = serialize(&orig).await;
+
+        let expected = r#"<D:multistatus xmlns:D="DAV:">
+    <D:response>
+        <D:href>http://www.example.com/container/</D:href>
+        <D:propstat>
+            <D:prop>
+                <D:creationdate/>
+                <D:displayname/>
+                <D:resourcetype/>
+                <D:supportedlock/>
+            </D:prop>
+            <D:status>HTTP/1.1 200 OK</D:status>
+        </D:propstat>
+    </D:response>
+    <D:response>
+        <D:href>http://www.example.com/container/front.html</D:href>
+        <D:propstat>
+            <D:prop>
+                <D:creationdate/>
+                <D:displayname/>
+                <D:getcontentlength/>
+                <D:getcontenttype/>
+                <D:getetag/>
+                <D:getlastmodified/>
+                <D:resourcetype/>
+                <D:supportedlock/>
+            </D:prop>
+            <D:status>HTTP/1.1 200 OK</D:status>
+        </D:propstat>
+    </D:response>
+</D:multistatus>"#;
+
+        assert_eq!(
+            &got, expected,
+            "\n---GOT---\n{got}\n---EXP---\n{expected}\n"
+        );
+        assert_eq!(deserialize::<Multistatus::<Core>>(got.as_str()).await, orig)
+    }
+
+    #[tokio::test]
+    async fn rfc_allprop_req() {
+        let orig = PropFind::<Core>::AllProp(None);
+        let got = serialize(&orig).await;
+
+        let expected = r#"<D:propfind xmlns:D="DAV:">
+    <D:allprop/>
+</D:propfind>"#;
+
+        assert_eq!(
+            &got, expected,
+            "\n---GOT---\n{got}\n---EXP---\n{expected}\n"
+        );
+        assert_eq!(deserialize::<PropFind::<Core>>(got.as_str()).await, orig)
+    }
+
+    #[tokio::test]
+    async fn rfc_allprop_res() {
+        use chrono::{FixedOffset, TimeZone};
+
+        let orig = Multistatus::<Core> {
+            extension: None,
+            responses: vec![
+                Response {
+                    status_or_propstat: StatusOrPropstat::PropStat(
+                        Href("/container/".into()),
+                        vec![PropStat {
+                            prop: AnyProp(vec![
+                                AnyProperty::Value(Property::CreationDate(
+                                    FixedOffset::west_opt(8 * 3600)
+                                        .unwrap()
+                                        .with_ymd_and_hms(1997, 12, 1, 17, 42, 21)
+                                        .unwrap(),
+                                )),
+                                AnyProperty::Value(Property::DisplayName(
+                                    "Example collection".into(),
+                                )),
+                                AnyProperty::Value(Property::ResourceType(vec![
+                                    ResourceType::Collection,
+                                ])),
+                                AnyProperty::Value(Property::SupportedLock(vec![
+                                    LockEntry {
+                                        lockscope: LockScope::Exclusive,
+                                        locktype: LockType::Write,
+                                    },
+                                    LockEntry {
+                                        lockscope: LockScope::Shared,
+                                        locktype: LockType::Write,
+                                    },
+                                ])),
+                            ]),
+                            status: Status(http::status::StatusCode::OK),
+                            error: None,
+                            responsedescription: None,
+                        }],
+                    ),
+                    error: None,
+                    responsedescription: None,
+                    location: None,
+                },
+                Response {
+                    status_or_propstat: StatusOrPropstat::PropStat(
+                        Href("/container/front.html".into()),
+                        vec![PropStat {
+                            prop: AnyProp(vec![
+                                AnyProperty::Value(Property::CreationDate(
+                                    FixedOffset::west_opt(8 * 3600)
+                                        .unwrap()
+                                        .with_ymd_and_hms(1997, 12, 1, 18, 27, 21)
+                                        .unwrap(),
+                                )),
+                                AnyProperty::Value(Property::DisplayName(
+                                    "Example HTML resource".into(),
+                                )),
+                                AnyProperty::Value(Property::GetContentLength(4525)),
+                                AnyProperty::Value(Property::GetContentType("text/html".into())),
+                                AnyProperty::Value(Property::GetEtag(r#""zzyzx""#.into())),
+                                AnyProperty::Value(Property::GetLastModified(
+                                    FixedOffset::east_opt(0)
+                                        .unwrap()
+                                        .with_ymd_and_hms(1998, 1, 12, 9, 25, 56)
+                                        .unwrap(),
+                                )),
+                                //@FIXME know bug, can't disambiguate between an empty resource
+                                //type value and a request resource type
+                                AnyProperty::Request(PropertyRequest::ResourceType),
+                                AnyProperty::Value(Property::SupportedLock(vec![
+                                    LockEntry {
+                                        lockscope: LockScope::Exclusive,
+                                        locktype: LockType::Write,
+                                    },
+                                    LockEntry {
+                                        lockscope: LockScope::Shared,
+                                        locktype: LockType::Write,
+                                    },
+                                ])),
+                            ]),
+                            status: Status(http::status::StatusCode::OK),
+                            error: None,
+                            responsedescription: None,
+                        }],
+                    ),
+                    error: None,
+                    responsedescription: None,
+                    location: None,
+                },
+            ],
+            responsedescription: None,
+        };
+
+        let got = serialize(&orig).await;
+
+        let expected = r#"<D:multistatus xmlns:D="DAV:">
+    <D:response>
+        <D:href>/container/</D:href>
+        <D:propstat>
+            <D:prop>
+                <D:creationdate>1997-12-01T17:42:21-08:00</D:creationdate>
+                <D:displayname>Example collection</D:displayname>
+                <D:resourcetype>
+                    <D:collection/>
+                </D:resourcetype>
+                <D:supportedlock>
+                    <D:lockentry>
+                        <D:lockscope>
+                            <D:exclusive/>
+                        </D:lockscope>
+                        <D:locktype>
+                            <D:write/>
+                        </D:locktype>
+                    </D:lockentry>
+                    <D:lockentry>
+                        <D:lockscope>
+                            <D:shared/>
+                        </D:lockscope>
+                        <D:locktype>
+                            <D:write/>
+                        </D:locktype>
+                    </D:lockentry>
+                </D:supportedlock>
+            </D:prop>
+            <D:status>HTTP/1.1 200 OK</D:status>
+        </D:propstat>
+    </D:response>
+    <D:response>
+        <D:href>/container/front.html</D:href>
+        <D:propstat>
+            <D:prop>
+                <D:creationdate>1997-12-01T18:27:21-08:00</D:creationdate>
+                <D:displayname>Example HTML resource</D:displayname>
+                <D:getcontentlength>4525</D:getcontentlength>
+                <D:getcontenttype>text/html</D:getcontenttype>
+                <D:getetag>&quot;zzyzx&quot;</D:getetag>
+                <D:getlastmodified>Mon, 12 Jan 1998 09:25:56 +0000</D:getlastmodified>
+                <D:resourcetype/>
+                <D:supportedlock>
+                    <D:lockentry>
+                        <D:lockscope>
+                            <D:exclusive/>
+                        </D:lockscope>
+                        <D:locktype>
+                            <D:write/>
+                        </D:locktype>
+                    </D:lockentry>
+                    <D:lockentry>
+                        <D:lockscope>
+                            <D:shared/>
+                        </D:lockscope>
+                        <D:locktype>
+                            <D:write/>
+                        </D:locktype>
+                    </D:lockentry>
+                </D:supportedlock>
+            </D:prop>
+            <D:status>HTTP/1.1 200 OK</D:status>
+        </D:propstat>
+    </D:response>
+</D:multistatus>"#;
+
+        assert_eq!(
+            &got, expected,
+            "\n---GOT---\n{got}\n---EXP---\n{expected}\n"
+        );
+        assert_eq!(deserialize::<Multistatus::<Core>>(got.as_str()).await, orig)
+    }
+
+    #[tokio::test]
+    async fn rfc_allprop_include() {
+        let orig = PropFind::<Core>::AllProp(Some(Include(vec![
+            PropertyRequest::DisplayName,
+            PropertyRequest::ResourceType,
+        ])));
+
+        let got = serialize(&orig).await;
+
+        let expected = r#"<D:propfind xmlns:D="DAV:">
+    <D:allprop/>
+    <D:include>
+        <D:displayname/>
+        <D:resourcetype/>
+    </D:include>
+</D:propfind>"#;
+
+        assert_eq!(
+            &got, expected,
+            "\n---GOT---\n{got}\n---EXP---\n{expected}\n"
+        );
+        assert_eq!(deserialize::<PropFind::<Core>>(got.as_str()).await, orig)
+    }
+
+    #[tokio::test]
+    async fn rfc_propertyupdate() {
+        let orig = PropertyUpdate::<Core>(vec![
+            PropertyUpdateItem::Set(Set(PropValue(vec![Property::GetContentLanguage(
+                "fr-FR".into(),
+            )]))),
+            PropertyUpdateItem::Remove(Remove(PropName(vec![PropertyRequest::DisplayName]))),
+        ]);
+        let got = serialize(&orig).await;
+
+        let expected = r#"<D:propertyupdate xmlns:D="DAV:">
+    <D:set>
+        <D:prop>
+            <D:getcontentlanguage>fr-FR</D:getcontentlanguage>
+        </D:prop>
+    </D:set>
+    <D:remove>
+        <D:prop>
+            <D:displayname/>
+        </D:prop>
+    </D:remove>
+</D:propertyupdate>"#;
+
+        assert_eq!(
+            &got, expected,
+            "\n---GOT---\n{got}\n---EXP---\n{expected}\n"
+        );
+        assert_eq!(
+            deserialize::<PropertyUpdate::<Core>>(got.as_str()).await,
+            orig
+        )
+    }
+
+    #[tokio::test]
+    async fn rfc_delete_locked2() {
+        let orig = Multistatus::<Core> {
+            extension: None,
+            responses: vec![Response {
+                status_or_propstat: StatusOrPropstat::Status(
+                    vec![Href("http://www.example.com/container/resource3".into())],
+                    Status(http::status::StatusCode::from_u16(423).unwrap()),
+                ),
+                error: Some(Error(vec![Violation::LockTokenSubmitted(vec![])])),
+                responsedescription: None,
+                location: None,
+            }],
+            responsedescription: None,
+        };
+
+        let got = serialize(&orig).await;
+
+        let expected = r#"<D:multistatus xmlns:D="DAV:">
+    <D:response>
+        <D:href>http://www.example.com/container/resource3</D:href>
+        <D:status>HTTP/1.1 423 Locked</D:status>
+        <D:error>
+            <D:lock-token-submitted/>
+        </D:error>
+    </D:response>
+</D:multistatus>"#;
+
+        assert_eq!(
+            &got, expected,
+            "\n---GOT---\n{got}\n---EXP---\n{expected}\n"
+        );
+        assert_eq!(deserialize::<Multistatus::<Core>>(got.as_str()).await, orig)
+    }
+
+    #[tokio::test]
+    async fn rfc_simple_lock_request() {
+        let orig = LockInfo {
+            lockscope: LockScope::Exclusive,
+            locktype: LockType::Write,
+            owner: Some(Owner::Href(Href(
+                "http://example.org/~ejw/contact.html".into(),
+            ))),
+        };
+
+        let got = serialize(&orig).await;
+
+        let expected = r#"<D:lockinfo xmlns:D="DAV:">
+    <D:lockscope>
+        <D:exclusive/>
+    </D:lockscope>
+    <D:locktype>
+        <D:write/>
+    </D:locktype>
+    <D:owner>
+        <D:href>http://example.org/~ejw/contact.html</D:href>
+    </D:owner>
+</D:lockinfo>"#;
+
+        assert_eq!(
+            &got, expected,
+            "\n---GOT---\n{got}\n---EXP---\n{expected}\n"
+        );
+        assert_eq!(deserialize::<LockInfo>(got.as_str()).await, orig)
+    }
+
+    #[tokio::test]
+    async fn rfc_simple_lock_response() {
+        let orig = PropValue::<Core>(vec![Property::LockDiscovery(vec![ActiveLock {
+            lockscope: LockScope::Exclusive,
+            locktype: LockType::Write,
+            depth: Depth::Infinity,
+            owner: Some(Owner::Href(Href(
+                "http://example.org/~ejw/contact.html".into(),
+            ))),
+            timeout: Some(Timeout::Seconds(604800)),
+            locktoken: Some(LockToken(Href(
+                "urn:uuid:e71d4fae-5dec-22d6-fea5-00a0c91e6be4".into(),
+            ))),
+            lockroot: LockRoot(Href(
+                "http://example.com/workspace/webdav/proposal.doc".into(),
+            )),
+        }])]);
+
+        let got = serialize(&orig).await;
+
+        let expected = r#"<D:prop xmlns:D="DAV:">
+    <D:lockdiscovery>
+        <D:activelock>
+            <D:locktype>
+                <D:write/>
+            </D:locktype>
+            <D:lockscope>
+                <D:exclusive/>
+            </D:lockscope>
+            <D:depth>infinity</D:depth>
+            <D:owner>
+                <D:href>http://example.org/~ejw/contact.html</D:href>
+            </D:owner>
+            <D:timeout>Second-604800</D:timeout>
+            <D:locktoken>
+                <D:href>urn:uuid:e71d4fae-5dec-22d6-fea5-00a0c91e6be4</D:href>
+            </D:locktoken>
+            <D:lockroot>
+                <D:href>http://example.com/workspace/webdav/proposal.doc</D:href>
+            </D:lockroot>
+        </D:activelock>
+    </D:lockdiscovery>
+</D:prop>"#;
+
+        assert_eq!(
+            &got, expected,
+            "\n---GOT---\n{got}\n---EXP---\n{expected}\n"
+        );
+        assert_eq!(deserialize::<PropValue::<Core>>(got.as_str()).await, orig)
+    }
+}
diff --git a/aero-dav/src/error.rs b/aero-dav/src/error.rs
new file mode 100644
index 0000000..c8f1de1
--- /dev/null
+++ b/aero-dav/src/error.rs
@@ -0,0 +1,62 @@
+use quick_xml::events::attributes::AttrError;
+
+#[derive(Debug)]
+pub enum ParsingError {
+    Recoverable,
+    MissingChild,
+    MissingAttribute,
+    NamespacePrefixAlreadyUsed,
+    WrongToken,
+    TagNotFound,
+    InvalidValue,
+    Utf8Error(std::str::Utf8Error),
+    QuickXml(quick_xml::Error),
+    Chrono(chrono::format::ParseError),
+    Int(std::num::ParseIntError),
+    Eof,
+}
+impl std::fmt::Display for ParsingError {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match self {
+            Self::Recoverable => write!(f, "Recoverable"),
+            Self::MissingChild => write!(f, "Missing child"),
+            Self::MissingAttribute => write!(f, "Missing attribute"),
+            Self::NamespacePrefixAlreadyUsed => write!(f, "Namespace prefix already used"),
+            Self::WrongToken => write!(f, "Wrong token"),
+            Self::TagNotFound => write!(f, "Tag not found"),
+            Self::InvalidValue => write!(f, "Invalid value"),
+            Self::Utf8Error(_) => write!(f, "Utf8 Error"),
+            Self::QuickXml(_) => write!(f, "Quick XML error"),
+            Self::Chrono(_) => write!(f, "Chrono error"),
+            Self::Int(_) => write!(f, "Number parsing error"),
+            Self::Eof => write!(f, "Found EOF while expecting data"),
+        }
+    }
+}
+impl std::error::Error for ParsingError {}
+impl From<AttrError> for ParsingError {
+    fn from(value: AttrError) -> Self {
+        Self::QuickXml(value.into())
+    }
+}
+impl From<quick_xml::Error> for ParsingError {
+    fn from(value: quick_xml::Error) -> Self {
+        Self::QuickXml(value)
+    }
+}
+impl From<std::str::Utf8Error> for ParsingError {
+    fn from(value: std::str::Utf8Error) -> Self {
+        Self::Utf8Error(value)
+    }
+}
+impl From<chrono::format::ParseError> for ParsingError {
+    fn from(value: chrono::format::ParseError) -> Self {
+        Self::Chrono(value)
+    }
+}
+
+impl From<std::num::ParseIntError> for ParsingError {
+    fn from(value: std::num::ParseIntError) -> Self {
+        Self::Int(value)
+    }
+}
diff --git a/aero-dav/src/lib.rs b/aero-dav/src/lib.rs
new file mode 100644
index 0000000..64be929
--- /dev/null
+++ b/aero-dav/src/lib.rs
@@ -0,0 +1,35 @@
+#![feature(type_alias_impl_trait)]
+#![feature(async_closure)]
+#![feature(trait_alias)]
+
+// utils
+pub mod error;
+pub mod xml;
+
+// webdav
+pub mod decoder;
+pub mod encoder;
+pub mod types;
+
+// calendar
+pub mod caldecoder;
+pub mod calencoder;
+pub mod caltypes;
+
+// acl (partial)
+pub mod acldecoder;
+pub mod aclencoder;
+pub mod acltypes;
+
+// versioning (partial)
+pub mod versioningdecoder;
+pub mod versioningencoder;
+pub mod versioningtypes;
+
+// sync
+pub mod syncdecoder;
+pub mod syncencoder;
+pub mod synctypes;
+
+// final type
+pub mod realization;
diff --git a/aero-dav/src/realization.rs b/aero-dav/src/realization.rs
new file mode 100644
index 0000000..76170f8
--- /dev/null
+++ b/aero-dav/src/realization.rs
@@ -0,0 +1,260 @@
+use super::acltypes as acl;
+use super::caltypes as cal;
+use super::error;
+use super::synctypes as sync;
+use super::types as dav;
+use super::versioningtypes as vers;
+use super::xml;
+
+#[derive(Debug, PartialEq, Clone)]
+pub struct Disabled(());
+impl xml::QRead<Disabled> for Disabled {
+    async fn qread(_xml: &mut xml::Reader<impl xml::IRead>) -> Result<Self, error::ParsingError> {
+        Err(error::ParsingError::Recoverable)
+    }
+}
+impl xml::QWrite for Disabled {
+    async fn qwrite(
+        &self,
+        _xml: &mut xml::Writer<impl xml::IWrite>,
+    ) -> Result<(), quick_xml::Error> {
+        unreachable!()
+    }
+}
+
+/// The base WebDAV
+///
+/// Any extension is disabled through an object we can't build
+/// due to a private inner element.
+#[derive(Debug, PartialEq, Clone)]
+pub struct Core {}
+impl dav::Extension for Core {
+    type Error = Disabled;
+    type Property = Disabled;
+    type PropertyRequest = Disabled;
+    type ResourceType = Disabled;
+    type ReportType = Disabled;
+    type ReportTypeName = Disabled;
+    type Multistatus = Disabled;
+}
+
+// WebDAV with the base Calendar implementation (RFC4791)
+#[derive(Debug, PartialEq, Clone)]
+pub struct Calendar {}
+impl dav::Extension for Calendar {
+    type Error = cal::Violation;
+    type Property = cal::Property;
+    type PropertyRequest = cal::PropertyRequest;
+    type ResourceType = cal::ResourceType;
+    type ReportType = cal::ReportType<Calendar>;
+    type ReportTypeName = cal::ReportTypeName;
+    type Multistatus = Disabled;
+}
+
+// ACL
+#[derive(Debug, PartialEq, Clone)]
+pub struct Acl {}
+impl dav::Extension for Acl {
+    type Error = Disabled;
+    type Property = acl::Property;
+    type PropertyRequest = acl::PropertyRequest;
+    type ResourceType = acl::ResourceType;
+    type ReportType = Disabled;
+    type ReportTypeName = Disabled;
+    type Multistatus = Disabled;
+}
+
+// All merged
+#[derive(Debug, PartialEq, Clone)]
+pub struct All {}
+impl dav::Extension for All {
+    type Error = cal::Violation;
+    type Property = Property<All>;
+    type PropertyRequest = PropertyRequest;
+    type ResourceType = ResourceType;
+    type ReportType = ReportType<All>;
+    type ReportTypeName = ReportTypeName;
+    type Multistatus = Multistatus;
+}
+
+#[derive(Debug, PartialEq, Clone)]
+pub enum Property<E: dav::Extension> {
+    Cal(cal::Property),
+    Acl(acl::Property),
+    Sync(sync::Property),
+    Vers(vers::Property<E>),
+}
+impl<E: dav::Extension> xml::QRead<Property<E>> for Property<E> {
+    async fn qread(xml: &mut xml::Reader<impl xml::IRead>) -> Result<Self, error::ParsingError> {
+        match cal::Property::qread(xml).await {
+            Err(error::ParsingError::Recoverable) => (),
+            otherwise => return otherwise.map(Property::<E>::Cal),
+        }
+        match acl::Property::qread(xml).await {
+            Err(error::ParsingError::Recoverable) => (),
+            otherwise => return otherwise.map(Property::Acl),
+        }
+        match sync::Property::qread(xml).await {
+            Err(error::ParsingError::Recoverable) => (),
+            otherwise => return otherwise.map(Property::Sync),
+        }
+        vers::Property::qread(xml).await.map(Property::Vers)
+    }
+}
+impl<E: dav::Extension> xml::QWrite for Property<E> {
+    async fn qwrite(
+        &self,
+        xml: &mut xml::Writer<impl xml::IWrite>,
+    ) -> Result<(), quick_xml::Error> {
+        match self {
+            Self::Cal(c) => c.qwrite(xml).await,
+            Self::Acl(a) => a.qwrite(xml).await,
+            Self::Sync(s) => s.qwrite(xml).await,
+            Self::Vers(v) => v.qwrite(xml).await,
+        }
+    }
+}
+
+#[derive(Debug, PartialEq, Clone)]
+pub enum PropertyRequest {
+    Cal(cal::PropertyRequest),
+    Acl(acl::PropertyRequest),
+    Sync(sync::PropertyRequest),
+    Vers(vers::PropertyRequest),
+}
+impl xml::QRead<PropertyRequest> for PropertyRequest {
+    async fn qread(xml: &mut xml::Reader<impl xml::IRead>) -> Result<Self, error::ParsingError> {
+        match cal::PropertyRequest::qread(xml).await {
+            Err(error::ParsingError::Recoverable) => (),
+            otherwise => return otherwise.map(PropertyRequest::Cal),
+        }
+        match acl::PropertyRequest::qread(xml).await {
+            Err(error::ParsingError::Recoverable) => (),
+            otherwise => return otherwise.map(PropertyRequest::Acl),
+        }
+        match sync::PropertyRequest::qread(xml).await {
+            Err(error::ParsingError::Recoverable) => (),
+            otherwise => return otherwise.map(PropertyRequest::Sync),
+        }
+        vers::PropertyRequest::qread(xml)
+            .await
+            .map(PropertyRequest::Vers)
+    }
+}
+impl xml::QWrite for PropertyRequest {
+    async fn qwrite(
+        &self,
+        xml: &mut xml::Writer<impl xml::IWrite>,
+    ) -> Result<(), quick_xml::Error> {
+        match self {
+            Self::Cal(c) => c.qwrite(xml).await,
+            Self::Acl(a) => a.qwrite(xml).await,
+            Self::Sync(s) => s.qwrite(xml).await,
+            Self::Vers(v) => v.qwrite(xml).await,
+        }
+    }
+}
+
+#[derive(Debug, PartialEq, Clone)]
+pub enum ResourceType {
+    Cal(cal::ResourceType),
+    Acl(acl::ResourceType),
+}
+impl xml::QRead<ResourceType> for ResourceType {
+    async fn qread(xml: &mut xml::Reader<impl xml::IRead>) -> Result<Self, error::ParsingError> {
+        match cal::ResourceType::qread(xml).await {
+            Err(error::ParsingError::Recoverable) => (),
+            otherwise => return otherwise.map(ResourceType::Cal),
+        }
+        acl::ResourceType::qread(xml).await.map(ResourceType::Acl)
+    }
+}
+impl xml::QWrite for ResourceType {
+    async fn qwrite(
+        &self,
+        xml: &mut xml::Writer<impl xml::IWrite>,
+    ) -> Result<(), quick_xml::Error> {
+        match self {
+            Self::Cal(c) => c.qwrite(xml).await,
+            Self::Acl(a) => a.qwrite(xml).await,
+        }
+    }
+}
+
+#[derive(Debug, PartialEq, Clone)]
+pub enum ReportType<E: dav::Extension> {
+    Cal(cal::ReportType<E>),
+    Sync(sync::SyncCollection<E>),
+}
+impl<E: dav::Extension> xml::QRead<ReportType<E>> for ReportType<E> {
+    async fn qread(
+        xml: &mut xml::Reader<impl xml::IRead>,
+    ) -> Result<ReportType<E>, error::ParsingError> {
+        match cal::ReportType::qread(xml).await {
+            Err(error::ParsingError::Recoverable) => (),
+            otherwise => return otherwise.map(ReportType::Cal),
+        }
+        sync::SyncCollection::qread(xml).await.map(ReportType::Sync)
+    }
+}
+impl<E: dav::Extension> xml::QWrite for ReportType<E> {
+    async fn qwrite(
+        &self,
+        xml: &mut xml::Writer<impl xml::IWrite>,
+    ) -> Result<(), quick_xml::Error> {
+        match self {
+            Self::Cal(c) => c.qwrite(xml).await,
+            Self::Sync(s) => s.qwrite(xml).await,
+        }
+    }
+}
+
+#[derive(Debug, PartialEq, Clone)]
+pub enum ReportTypeName {
+    Cal(cal::ReportTypeName),
+    Sync(sync::ReportTypeName),
+}
+impl xml::QRead<ReportTypeName> for ReportTypeName {
+    async fn qread(xml: &mut xml::Reader<impl xml::IRead>) -> Result<Self, error::ParsingError> {
+        match cal::ReportTypeName::qread(xml).await {
+            Err(error::ParsingError::Recoverable) => (),
+            otherwise => return otherwise.map(ReportTypeName::Cal),
+        }
+        sync::ReportTypeName::qread(xml)
+            .await
+            .map(ReportTypeName::Sync)
+    }
+}
+impl xml::QWrite for ReportTypeName {
+    async fn qwrite(
+        &self,
+        xml: &mut xml::Writer<impl xml::IWrite>,
+    ) -> Result<(), quick_xml::Error> {
+        match self {
+            Self::Cal(c) => c.qwrite(xml).await,
+            Self::Sync(s) => s.qwrite(xml).await,
+        }
+    }
+}
+
+#[derive(Debug, PartialEq, Clone)]
+pub enum Multistatus {
+    Sync(sync::Multistatus),
+}
+
+impl xml::QWrite for Multistatus {
+    async fn qwrite(
+        &self,
+        xml: &mut xml::Writer<impl xml::IWrite>,
+    ) -> Result<(), quick_xml::Error> {
+        match self {
+            Self::Sync(s) => s.qwrite(xml).await,
+        }
+    }
+}
+
+impl xml::QRead<Multistatus> for Multistatus {
+    async fn qread(xml: &mut xml::Reader<impl xml::IRead>) -> Result<Self, error::ParsingError> {
+        sync::Multistatus::qread(xml).await.map(Self::Sync)
+    }
+}
diff --git a/aero-dav/src/syncdecoder.rs b/aero-dav/src/syncdecoder.rs
new file mode 100644
index 0000000..2a61dea
--- /dev/null
+++ b/aero-dav/src/syncdecoder.rs
@@ -0,0 +1,248 @@
+use quick_xml::events::Event;
+
+use super::error::ParsingError;
+use super::synctypes::*;
+use super::types as dav;
+use super::xml::{IRead, QRead, Reader, DAV_URN};
+
+impl QRead<PropertyRequest> for PropertyRequest {
+    async fn qread(xml: &mut Reader<impl IRead>) -> Result<Self, ParsingError> {
+        if xml.maybe_open(DAV_URN, "sync-token").await?.is_some() {
+            xml.close().await?;
+            return Ok(Self::SyncToken);
+        }
+        return Err(ParsingError::Recoverable);
+    }
+}
+
+impl QRead<Property> for Property {
+    async fn qread(xml: &mut Reader<impl IRead>) -> Result<Self, ParsingError> {
+        let mut dirty = false;
+        let mut m_cdr = None;
+        xml.maybe_read(&mut m_cdr, &mut dirty).await?;
+        m_cdr.ok_or(ParsingError::Recoverable).map(Self::SyncToken)
+    }
+}
+
+impl QRead<ReportTypeName> for ReportTypeName {
+    async fn qread(xml: &mut Reader<impl IRead>) -> Result<Self, ParsingError> {
+        if xml.maybe_open(DAV_URN, "sync-collection").await?.is_some() {
+            xml.close().await?;
+            return Ok(Self::SyncCollection);
+        }
+        Err(ParsingError::Recoverable)
+    }
+}
+
+impl QRead<Multistatus> for Multistatus {
+    async fn qread(xml: &mut Reader<impl IRead>) -> Result<Self, ParsingError> {
+        SyncToken::qread(xml)
+            .await
+            .map(|sync_token| Multistatus { sync_token })
+    }
+}
+
+impl<E: dav::Extension> QRead<SyncCollection<E>> for SyncCollection<E> {
+    async fn qread(xml: &mut Reader<impl IRead>) -> Result<Self, ParsingError> {
+        xml.open(DAV_URN, "sync-collection").await?;
+        let (mut sync_token, mut sync_level, mut limit, mut prop) = (None, None, None, None);
+        loop {
+            let mut dirty = false;
+            xml.maybe_read(&mut sync_token, &mut dirty).await?;
+            xml.maybe_read(&mut sync_level, &mut dirty).await?;
+            xml.maybe_read(&mut limit, &mut dirty).await?;
+            xml.maybe_read(&mut prop, &mut dirty).await?;
+
+            if !dirty {
+                match xml.peek() {
+                    Event::End(_) => break,
+                    _ => xml.skip().await?,
+                };
+            }
+        }
+
+        xml.close().await?;
+        match (sync_token, sync_level, prop) {
+            (Some(sync_token), Some(sync_level), Some(prop)) => Ok(SyncCollection {
+                sync_token,
+                sync_level,
+                limit,
+                prop,
+            }),
+            _ => Err(ParsingError::MissingChild),
+        }
+    }
+}
+
+impl QRead<SyncTokenRequest> for SyncTokenRequest {
+    async fn qread(xml: &mut Reader<impl IRead>) -> Result<Self, ParsingError> {
+        xml.open(DAV_URN, "sync-token").await?;
+        let token = match xml.tag_string().await {
+            Ok(v) => SyncTokenRequest::IncrementalSync(v),
+            Err(ParsingError::Recoverable) => SyncTokenRequest::InitialSync,
+            Err(e) => return Err(e),
+        };
+        xml.close().await?;
+        Ok(token)
+    }
+}
+
+impl QRead<SyncToken> for SyncToken {
+    async fn qread(xml: &mut Reader<impl IRead>) -> Result<Self, ParsingError> {
+        xml.open(DAV_URN, "sync-token").await?;
+        let token = xml.tag_string().await?;
+        xml.close().await?;
+        Ok(SyncToken(token))
+    }
+}
+
+impl QRead<SyncLevel> for SyncLevel {
+    async fn qread(xml: &mut Reader<impl IRead>) -> Result<Self, ParsingError> {
+        xml.open(DAV_URN, "sync-level").await?;
+        let lvl = match xml.tag_string().await?.to_lowercase().as_str() {
+            "1" => SyncLevel::One,
+            "infinite" => SyncLevel::Infinite,
+            _ => return Err(ParsingError::InvalidValue),
+        };
+        xml.close().await?;
+        Ok(lvl)
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::realization::{self, All};
+    use crate::types as dav;
+    use crate::versioningtypes as vers;
+    use crate::xml::Node;
+
+    async fn deserialize<T: Node<T>>(src: &str) -> T {
+        let mut rdr = Reader::new(quick_xml::NsReader::from_reader(src.as_bytes()))
+            .await
+            .unwrap();
+        rdr.find().await.unwrap()
+    }
+
+    #[tokio::test]
+    async fn sync_level() {
+        {
+            let expected = SyncLevel::One;
+            let src = r#"<D:sync-level xmlns:D="DAV:">1</D:sync-level>"#;
+            let got = deserialize::<SyncLevel>(src).await;
+            assert_eq!(got, expected);
+        }
+        {
+            let expected = SyncLevel::Infinite;
+            let src = r#"<D:sync-level xmlns:D="DAV:">infinite</D:sync-level>"#;
+            let got = deserialize::<SyncLevel>(src).await;
+            assert_eq!(got, expected);
+        }
+    }
+
+    #[tokio::test]
+    async fn sync_token_request() {
+        {
+            let expected = SyncTokenRequest::InitialSync;
+            let src = r#"<D:sync-token xmlns:D="DAV:"/>"#;
+            let got = deserialize::<SyncTokenRequest>(src).await;
+            assert_eq!(got, expected);
+        }
+        {
+            let expected =
+                SyncTokenRequest::IncrementalSync("http://example.com/ns/sync/1232".into());
+            let src =
+                r#"<D:sync-token xmlns:D="DAV:">http://example.com/ns/sync/1232</D:sync-token>"#;
+            let got = deserialize::<SyncTokenRequest>(src).await;
+            assert_eq!(got, expected);
+        }
+    }
+
+    #[tokio::test]
+    async fn sync_token() {
+        let expected = SyncToken("http://example.com/ns/sync/1232".into());
+        let src = r#"<D:sync-token xmlns:D="DAV:">http://example.com/ns/sync/1232</D:sync-token>"#;
+        let got = deserialize::<SyncToken>(src).await;
+        assert_eq!(got, expected);
+    }
+
+    #[tokio::test]
+    async fn sync_collection() {
+        {
+            let expected = SyncCollection::<All> {
+                sync_token: SyncTokenRequest::IncrementalSync(
+                    "http://example.com/ns/sync/1232".into(),
+                ),
+                sync_level: SyncLevel::One,
+                limit: Some(vers::Limit(vers::NResults(100))),
+                prop: dav::PropName(vec![dav::PropertyRequest::GetEtag]),
+            };
+            let src = r#"<D:sync-collection xmlns:D="DAV:">
+                <D:sync-token>http://example.com/ns/sync/1232</D:sync-token>
+                <D:sync-level>1</D:sync-level>
+                <D:limit>
+                    <D:nresults>100</D:nresults>
+                </D:limit>
+                <D:prop>
+                    <D:getetag/>
+                </D:prop>
+            </D:sync-collection>"#;
+            let got = deserialize::<SyncCollection<All>>(src).await;
+            assert_eq!(got, expected);
+        }
+
+        {
+            let expected = SyncCollection::<All> {
+                sync_token: SyncTokenRequest::InitialSync,
+                sync_level: SyncLevel::Infinite,
+                limit: None,
+                prop: dav::PropName(vec![dav::PropertyRequest::GetEtag]),
+            };
+            let src = r#"<D:sync-collection xmlns:D="DAV:">
+                <D:sync-token/>
+                <D:sync-level>infinite</D:sync-level>
+                <D:prop>
+                    <D:getetag/>
+                </D:prop>
+            </D:sync-collection>"#;
+            let got = deserialize::<SyncCollection<All>>(src).await;
+            assert_eq!(got, expected);
+        }
+    }
+
+    #[tokio::test]
+    async fn prop_req() {
+        let expected = dav::PropName::<All>(vec![dav::PropertyRequest::Extension(
+            realization::PropertyRequest::Sync(PropertyRequest::SyncToken),
+        )]);
+        let src = r#"<prop xmlns="DAV:"><sync-token/></prop>"#;
+        let got = deserialize::<dav::PropName<All>>(src).await;
+        assert_eq!(got, expected);
+    }
+
+    #[tokio::test]
+    async fn prop_val() {
+        let expected = dav::PropValue::<All>(vec![
+            dav::Property::Extension(realization::Property::Sync(Property::SyncToken(SyncToken(
+                "http://example.com/ns/sync/1232".into(),
+            )))),
+            dav::Property::Extension(realization::Property::Vers(
+                vers::Property::SupportedReportSet(vec![vers::SupportedReport(
+                    vers::ReportName::Extension(realization::ReportTypeName::Sync(
+                        ReportTypeName::SyncCollection,
+                    )),
+                )]),
+            )),
+        ]);
+        let src = r#"<prop xmlns="DAV:">
+            <sync-token>http://example.com/ns/sync/1232</sync-token>
+            <supported-report-set>
+                <supported-report>
+                    <report><sync-collection/></report>
+                </supported-report>
+            </supported-report-set>
+        </prop>"#;
+        let got = deserialize::<dav::PropValue<All>>(src).await;
+        assert_eq!(got, expected);
+    }
+}
diff --git a/aero-dav/src/syncencoder.rs b/aero-dav/src/syncencoder.rs
new file mode 100644
index 0000000..55f7ad6
--- /dev/null
+++ b/aero-dav/src/syncencoder.rs
@@ -0,0 +1,227 @@
+use quick_xml::events::{BytesText, Event};
+use quick_xml::Error as QError;
+
+use super::synctypes::*;
+use super::types::Extension;
+use super::xml::{IWrite, QWrite, Writer};
+
+impl QWrite for Property {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        match self {
+            Self::SyncToken(token) => token.qwrite(xml).await,
+        }
+    }
+}
+
+impl QWrite for PropertyRequest {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        match self {
+            Self::SyncToken => {
+                let start = xml.create_dav_element("sync-token");
+                xml.q.write_event_async(Event::Empty(start)).await
+            }
+        }
+    }
+}
+
+impl QWrite for ReportTypeName {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        match self {
+            Self::SyncCollection => {
+                let start = xml.create_dav_element("sync-collection");
+                xml.q.write_event_async(Event::Empty(start)).await
+            }
+        }
+    }
+}
+
+impl QWrite for Multistatus {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        self.sync_token.qwrite(xml).await
+    }
+}
+
+impl<E: Extension> QWrite for SyncCollection<E> {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        let start = xml.create_dav_element("sync-collection");
+        let end = start.to_end();
+
+        xml.q.write_event_async(Event::Start(start.clone())).await?;
+        self.sync_token.qwrite(xml).await?;
+        self.sync_level.qwrite(xml).await?;
+        if let Some(limit) = &self.limit {
+            limit.qwrite(xml).await?;
+        }
+        self.prop.qwrite(xml).await?;
+        xml.q.write_event_async(Event::End(end)).await
+    }
+}
+
+impl QWrite for SyncTokenRequest {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        let start = xml.create_dav_element("sync-token");
+
+        match self {
+            Self::InitialSync => xml.q.write_event_async(Event::Empty(start)).await,
+            Self::IncrementalSync(uri) => {
+                let end = start.to_end();
+                xml.q.write_event_async(Event::Start(start.clone())).await?;
+                xml.q
+                    .write_event_async(Event::Text(BytesText::new(uri.as_str())))
+                    .await?;
+                xml.q.write_event_async(Event::End(end)).await
+            }
+        }
+    }
+}
+
+impl QWrite for SyncToken {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        let start = xml.create_dav_element("sync-token");
+        let end = start.to_end();
+
+        xml.q.write_event_async(Event::Start(start.clone())).await?;
+        xml.q
+            .write_event_async(Event::Text(BytesText::new(self.0.as_str())))
+            .await?;
+        xml.q.write_event_async(Event::End(end)).await
+    }
+}
+
+impl QWrite for SyncLevel {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        let start = xml.create_dav_element("sync-level");
+        let end = start.to_end();
+        let text = match self {
+            Self::One => "1",
+            Self::Infinite => "infinite",
+        };
+
+        xml.q.write_event_async(Event::Start(start.clone())).await?;
+        xml.q
+            .write_event_async(Event::Text(BytesText::new(text)))
+            .await?;
+        xml.q.write_event_async(Event::End(end)).await
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::realization::{self, All};
+    use crate::types as dav;
+    use crate::versioningtypes as vers;
+    use crate::xml::Node;
+    use crate::xml::Reader;
+    use tokio::io::AsyncWriteExt;
+
+    async fn serialize_deserialize<T: Node<T>>(src: &T) {
+        let mut buffer = Vec::new();
+        let mut tokio_buffer = tokio::io::BufWriter::new(&mut buffer);
+        let q = quick_xml::writer::Writer::new_with_indent(&mut tokio_buffer, b' ', 4);
+        let ns_to_apply = vec![
+            ("xmlns:D".into(), "DAV:".into()),
+            ("xmlns:C".into(), "urn:ietf:params:xml:ns:caldav".into()),
+        ];
+        let mut writer = Writer { q, ns_to_apply };
+
+        src.qwrite(&mut writer).await.expect("xml serialization");
+        tokio_buffer.flush().await.expect("tokio buffer flush");
+        let got = std::str::from_utf8(buffer.as_slice()).unwrap();
+
+        // deserialize
+        let mut rdr = Reader::new(quick_xml::NsReader::from_reader(got.as_bytes()))
+            .await
+            .unwrap();
+        let res = rdr.find().await.unwrap();
+
+        // check
+        assert_eq!(src, &res);
+    }
+
+    #[tokio::test]
+    async fn sync_level() {
+        serialize_deserialize(&SyncLevel::One).await;
+        serialize_deserialize(&SyncLevel::Infinite).await;
+    }
+
+    #[tokio::test]
+    async fn sync_token_request() {
+        serialize_deserialize(&SyncTokenRequest::InitialSync).await;
+        serialize_deserialize(&SyncTokenRequest::IncrementalSync(
+            "http://example.com/ns/sync/1232".into(),
+        ))
+        .await;
+    }
+
+    #[tokio::test]
+    async fn sync_token() {
+        serialize_deserialize(&SyncToken("http://example.com/ns/sync/1232".into())).await;
+    }
+
+    #[tokio::test]
+    async fn sync_collection() {
+        serialize_deserialize(&SyncCollection::<All> {
+            sync_token: SyncTokenRequest::IncrementalSync("http://example.com/ns/sync/1232".into()),
+            sync_level: SyncLevel::One,
+            limit: Some(vers::Limit(vers::NResults(100))),
+            prop: dav::PropName(vec![dav::PropertyRequest::GetEtag]),
+        })
+        .await;
+
+        serialize_deserialize(&SyncCollection::<All> {
+            sync_token: SyncTokenRequest::InitialSync,
+            sync_level: SyncLevel::Infinite,
+            limit: None,
+            prop: dav::PropName(vec![dav::PropertyRequest::GetEtag]),
+        })
+        .await;
+    }
+
+    #[tokio::test]
+    async fn prop_req() {
+        serialize_deserialize(&dav::PropName::<All>(vec![
+            dav::PropertyRequest::Extension(realization::PropertyRequest::Sync(
+                PropertyRequest::SyncToken,
+            )),
+        ]))
+        .await;
+    }
+
+    #[tokio::test]
+    async fn prop_val() {
+        serialize_deserialize(&dav::PropValue::<All>(vec![
+            dav::Property::Extension(realization::Property::Sync(Property::SyncToken(SyncToken(
+                "http://example.com/ns/sync/1232".into(),
+            )))),
+            dav::Property::Extension(realization::Property::Vers(
+                vers::Property::SupportedReportSet(vec![vers::SupportedReport(
+                    vers::ReportName::Extension(realization::ReportTypeName::Sync(
+                        ReportTypeName::SyncCollection,
+                    )),
+                )]),
+            )),
+        ]))
+        .await;
+    }
+
+    #[tokio::test]
+    async fn multistatus_ext() {
+        serialize_deserialize(&dav::Multistatus::<All> {
+            responses: vec![dav::Response {
+                status_or_propstat: dav::StatusOrPropstat::Status(
+                    vec![dav::Href("/".into())],
+                    dav::Status(http::status::StatusCode::OK),
+                ),
+                error: None,
+                location: None,
+                responsedescription: None,
+            }],
+            responsedescription: None,
+            extension: Some(realization::Multistatus::Sync(Multistatus {
+                sync_token: SyncToken("http://example.com/ns/sync/1232".into()),
+            })),
+        })
+        .await;
+    }
+}
diff --git a/aero-dav/src/synctypes.rs b/aero-dav/src/synctypes.rs
new file mode 100644
index 0000000..2a14221
--- /dev/null
+++ b/aero-dav/src/synctypes.rs
@@ -0,0 +1,86 @@
+use super::types as dav;
+use super::versioningtypes as vers;
+
+// RFC 6578
+// https://datatracker.ietf.org/doc/html/rfc6578
+
+#[derive(Debug, PartialEq, Clone)]
+pub enum PropertyRequest {
+    SyncToken,
+}
+
+#[derive(Debug, PartialEq, Clone)]
+pub enum Property {
+    SyncToken(SyncToken),
+}
+
+#[derive(Debug, PartialEq, Clone)]
+pub enum ReportTypeName {
+    SyncCollection,
+}
+
+#[derive(Debug, PartialEq, Clone)]
+pub struct Multistatus {
+    pub sync_token: SyncToken,
+}
+
+//@FIXME add SyncToken to Multistatus
+
+///  Name:  sync-collection
+///
+/// Namespace:  DAV:
+///
+/// Purpose:  WebDAV report used to synchronize data between client and
+/// server.
+///
+/// Description:  See Section 3.
+///
+/// <!ELEMENT sync-collection (sync-token, sync-level, limit?, prop)>
+///
+/// <!-- DAV:limit defined in RFC 5323, Section 5.17 -->
+/// <!-- DAV:prop defined in RFC 4918, Section 14.18 -->
+
+#[derive(Debug, PartialEq, Clone)]
+pub struct SyncCollection<E: dav::Extension> {
+    pub sync_token: SyncTokenRequest,
+    pub sync_level: SyncLevel,
+    pub limit: Option<vers::Limit>,
+    pub prop: dav::PropName<E>,
+}
+
+/// Name:  sync-token
+///
+/// Namespace:  DAV:
+///
+/// Purpose:  The synchronization token provided by the server and
+/// returned by the client.
+///
+/// Description:  See Section 3.
+///
+/// <!ELEMENT sync-token CDATA>
+///
+/// <!-- Text MUST be a URI -->
+/// Used by multistatus
+#[derive(Debug, PartialEq, Clone)]
+pub struct SyncToken(pub String);
+
+/// Used by propfind and report sync-collection
+#[derive(Debug, PartialEq, Clone)]
+pub enum SyncTokenRequest {
+    InitialSync,
+    IncrementalSync(String),
+}
+
+/// Name:  sync-level
+///
+/// Namespace:  DAV:
+///
+/// Purpose:  Indicates the "scope" of the synchronization report
+/// request.
+///
+/// Description:  See Section 3.3.
+#[derive(Debug, PartialEq, Clone)]
+pub enum SyncLevel {
+    One,
+    Infinite,
+}
diff --git a/aero-dav/src/types.rs b/aero-dav/src/types.rs
new file mode 100644
index 0000000..61a6fe9
--- /dev/null
+++ b/aero-dav/src/types.rs
@@ -0,0 +1,964 @@
+#![allow(dead_code)]
+use std::fmt::Debug;
+
+use super::xml;
+use chrono::{DateTime, FixedOffset};
+
+/// It's how we implement a DAV extension
+/// (That's the dark magic part...)
+pub trait Extension: std::fmt::Debug + PartialEq + Clone {
+    type Error: xml::Node<Self::Error>;
+    type Property: xml::Node<Self::Property>;
+    type PropertyRequest: xml::Node<Self::PropertyRequest>;
+    type ResourceType: xml::Node<Self::ResourceType>;
+    type ReportType: xml::Node<Self::ReportType>;
+    type ReportTypeName: xml::Node<Self::ReportTypeName>;
+    type Multistatus: xml::Node<Self::Multistatus>;
+}
+
+/// 14.1.  activelock XML Element
+///
+/// Name:   activelock
+///
+/// Purpose:   Describes a lock on a resource.
+/// <!ELEMENT activelock (lockscope, locktype, depth, owner?, timeout?,
+///           locktoken?, lockroot)>
+#[derive(Debug, PartialEq, Clone)]
+pub struct ActiveLock {
+    pub lockscope: LockScope,
+    pub locktype: LockType,
+    pub depth: Depth,
+    pub owner: Option<Owner>,
+    pub timeout: Option<Timeout>,
+    pub locktoken: Option<LockToken>,
+    pub lockroot: LockRoot,
+}
+
+/// 14.3 collection XML Element
+///
+/// Name:   collection
+///
+/// Purpose:   Identifies the associated resource as a collection.  The
+/// DAV:resourcetype property of a collection resource MUST contain
+/// this element.  It is normally empty but extensions may add sub-
+/// elements.
+///
+/// <!ELEMENT collection EMPTY >
+#[derive(Debug, PartialEq)]
+pub struct Collection {}
+
+/// 14.4 depth XML Element
+///
+/// Name:   depth
+///
+/// Purpose:   Used for representing depth values in XML content (e.g.,
+/// in lock information).
+///
+/// Value:   "0" | "1" | "infinity"
+///
+/// <!ELEMENT depth (#PCDATA) >
+#[derive(Debug, PartialEq, Clone)]
+pub enum Depth {
+    Zero,
+    One,
+    Infinity,
+}
+
+/// 14.5 error XML Element
+///
+/// Name:   error
+///
+/// Purpose:   Error responses, particularly 403 Forbidden and 409
+///   Conflict, sometimes need more information to indicate what went
+///  wrong.  In these cases, servers MAY return an XML response body
+///   with a document element of 'error', containing child elements
+///   identifying particular condition codes.
+///
+/// Description:   Contains at least one XML element, and MUST NOT
+///  contain text or mixed content.  Any element that is a child of the
+///   'error' element is considered to be a precondition or
+///   postcondition code.  Unrecognized elements MUST be ignored.
+///
+/// <!ELEMENT error ANY >
+#[derive(Debug, PartialEq, Clone)]
+pub struct Error<E: Extension>(pub Vec<Violation<E>>);
+#[derive(Debug, PartialEq, Clone)]
+pub enum Violation<E: Extension> {
+    /// Name:  lock-token-matches-request-uri
+    ///
+    /// Use with:  409 Conflict
+    ///
+    /// Purpose:  (precondition) -- A request may include a Lock-Token header
+    /// to identify a lock for the UNLOCK method.  However, if the
+    /// Request-URI does not fall within the scope of the lock identified
+    /// by the token, the server SHOULD use this error.  The lock may have
+    /// a scope that does not include the Request-URI, or the lock could
+    /// have disappeared, or the token may be invalid.
+    LockTokenMatchesRequestUri,
+
+    /// Name:  lock-token-submitted (precondition)
+    ///
+    /// Use with:  423 Locked
+    ///
+    /// Purpose:  The request could not succeed because a lock token should
+    /// have been submitted.  This element, if present, MUST contain at
+    /// least one URL of a locked resource that prevented the request.  In
+    /// cases of MOVE, COPY, and DELETE where collection locks are
+    /// involved, it can be difficult for the client to find out which
+    /// locked resource made the request fail -- but the server is only
+    /// responsible for returning one such locked resource.  The server
+    /// MAY return every locked resource that prevented the request from
+    /// succeeding if it knows them all.
+    ///
+    /// <!ELEMENT lock-token-submitted (href+) >
+    LockTokenSubmitted(Vec<Href>),
+
+    /// Name:  no-conflicting-lock (precondition)
+    ///
+    /// Use with:  Typically 423 Locked
+    ///
+    /// Purpose:  A LOCK request failed due the presence of an already
+    /// existing conflicting lock.  Note that a lock can be in conflict
+    /// although the resource to which the request was directed is only
+    /// indirectly locked.  In this case, the precondition code can be
+    /// used to inform the client about the resource that is the root of
+    /// the conflicting lock, avoiding a separate lookup of the
+    /// "lockdiscovery" property.
+    ///
+    /// <!ELEMENT no-conflicting-lock (href)* >
+    NoConflictingLock(Vec<Href>),
+
+    /// Name:  no-external-entities
+    ///
+    /// Use with:  403 Forbidden
+    ///
+    /// Purpose:  (precondition) -- If the server rejects a client request
+    /// because the request body contains an external entity, the server
+    /// SHOULD use this error.
+    NoExternalEntities,
+
+    /// Name:  preserved-live-properties
+    ///
+    /// Use with:  409 Conflict
+    ///
+    /// Purpose:  (postcondition) -- The server received an otherwise-valid
+    /// MOVE or COPY request, but cannot maintain the live properties with
+    /// the same behavior at the destination.  It may be that the server
+    /// only supports some live properties in some parts of the
+    /// repository, or simply has an internal error.
+    PreservedLiveProperties,
+
+    /// Name:  propfind-finite-depth
+    ///
+    /// Use with:  403 Forbidden
+    ///
+    /// Purpose:  (precondition) -- This server does not allow infinite-depth
+    /// PROPFIND requests on collections.
+    PropfindFiniteDepth,
+
+    /// Name:  cannot-modify-protected-property
+    ///
+    /// Use with:  403 Forbidden
+    ///
+    /// Purpose:  (precondition) -- The client attempted to set a protected
+    /// property in a PROPPATCH (such as DAV:getetag).  See also
+    /// [RFC3253], Section 3.12.
+    CannotModifyProtectedProperty,
+
+    /// Specific errors
+    Extension(E::Error),
+}
+
+/// 14.6.  exclusive XML Element
+///
+/// Name:   exclusive
+///
+/// Purpose:   Specifies an exclusive lock.
+///
+/// <!ELEMENT exclusive EMPTY >
+#[derive(Debug, PartialEq)]
+pub struct Exclusive {}
+
+/// 14.7.  href XML Element
+///
+/// Name:   href
+///
+/// Purpose:   MUST contain a URI or a relative reference.
+///
+/// Description:   There may be limits on the value of 'href' depending
+///  on the context of its use.  Refer to the specification text where
+///   'href' is used to see what limitations apply in each case.
+///
+/// Value:   Simple-ref
+///
+/// <!ELEMENT href (#PCDATA)>
+#[derive(Debug, PartialEq, Clone)]
+pub struct Href(pub String);
+
+/// 14.8.  include XML Element
+///
+/// Name:   include
+///
+/// Purpose:   Any child element represents the name of a property to be
+/// included in the PROPFIND response.  All elements inside an
+/// 'include' XML element MUST define properties related to the
+/// resource, although possible property names are in no way limited
+/// to those property names defined in this document or other
+/// standards.  This element MUST NOT contain text or mixed content.
+///
+/// <!ELEMENT include ANY >
+#[derive(Debug, PartialEq, Clone)]
+pub struct Include<E: Extension>(pub Vec<PropertyRequest<E>>);
+
+/// 14.9.  location XML Element
+///
+/// Name:   location
+///
+/// Purpose:   HTTP defines the "Location" header (see [RFC2616], Section
+/// 14.30) for use with some status codes (such as 201 and the 300
+/// series codes).  When these codes are used inside a 'multistatus'
+/// element, the 'location' element can be used to provide the
+/// accompanying Location header value.
+///
+/// Description:   Contains a single href element with the same value
+/// that would be used in a Location header.
+///
+/// <!ELEMENT location (href)>
+#[derive(Debug, PartialEq, Clone)]
+pub struct Location(pub Href);
+
+/// 14.10.  lockentry XML Element
+///
+/// Name:   lockentry
+///
+/// Purpose:   Defines the types of locks that can be used with the
+/// resource.
+///
+/// <!ELEMENT lockentry (lockscope, locktype) >
+#[derive(Debug, PartialEq, Clone)]
+pub struct LockEntry {
+    pub lockscope: LockScope,
+    pub locktype: LockType,
+}
+
+/// 14.11.  lockinfo XML Element
+///
+/// Name:   lockinfo
+///
+/// Purpose:   The 'lockinfo' XML element is used with a LOCK method to
+/// specify the type of lock the client wishes to have created.
+///
+/// <!ELEMENT lockinfo (lockscope, locktype, owner?)  >
+#[derive(Debug, PartialEq, Clone)]
+pub struct LockInfo {
+    pub lockscope: LockScope,
+    pub locktype: LockType,
+    pub owner: Option<Owner>,
+}
+
+/// 14.12.  lockroot XML Element
+///
+/// Name:   lockroot
+///
+/// Purpose:   Contains the root URL of the lock, which is the URL
+/// through which the resource was addressed in the LOCK request.
+///
+/// Description:   The href element contains the root of the lock.  The
+/// server SHOULD include this in all DAV:lockdiscovery property
+/// values and the response to LOCK requests.
+///
+/// <!ELEMENT lockroot (href) >
+#[derive(Debug, PartialEq, Clone)]
+pub struct LockRoot(pub Href);
+
+/// 14.13.  lockscope XML Element
+///
+/// Name:   lockscope
+///
+/// Purpose:   Specifies whether a lock is an exclusive lock, or a shared
+/// lock.
+/// <!ELEMENT lockscope (exclusive | shared) >
+#[derive(Debug, PartialEq, Clone)]
+pub enum LockScope {
+    Exclusive,
+    Shared,
+}
+
+/// 14.14.  locktoken XML Element
+///
+/// Name:   locktoken
+///
+/// Purpose:   The lock token associated with a lock.
+///
+/// Description:   The href contains a single lock token URI, which
+///    refers to the lock.
+///
+/// <!ELEMENT locktoken (href) >
+#[derive(Debug, PartialEq, Clone)]
+pub struct LockToken(pub Href);
+
+/// 14.15.  locktype XML Element
+///
+/// Name:   locktype
+///
+/// Purpose:   Specifies the access type of a lock.  At present, this
+/// specification only defines one lock type, the write lock.
+///
+/// <!ELEMENT locktype (write) >
+#[derive(Debug, PartialEq, Clone)]
+pub enum LockType {
+    /// 14.30.  write XML Element
+    ///
+    /// Name:   write
+    ///
+    /// Purpose:   Specifies a write lock.
+    ///
+    ///
+    /// <!ELEMENT write EMPTY >
+    Write,
+}
+
+/// 14.16.  multistatus XML Element
+///
+/// Name:   multistatus
+///
+/// Purpose:   Contains multiple response messages.
+///
+/// Description:   The 'responsedescription' element at the top level is
+/// used to provide a general message describing the overarching
+/// nature of the response.  If this value is available, an
+/// application may use it instead of presenting the individual
+/// response descriptions contained within the responses.
+///
+/// <!ELEMENT multistatus (response*, responsedescription?)  >
+///
+/// In WebDAV sync (rfc6578), multistatus is extended:
+///
+/// <!ELEMENT multistatus (response*, responsedescription?, sync-token?) >
+#[derive(Debug, PartialEq, Clone)]
+pub struct Multistatus<E: Extension> {
+    pub responses: Vec<Response<E>>,
+    pub responsedescription: Option<ResponseDescription>,
+    pub extension: Option<E::Multistatus>,
+}
+
+/// 14.17.  owner XML Element
+///
+/// Name:   owner
+///
+/// Purpose:   Holds client-supplied information about the creator of a
+/// lock.
+///
+/// Description:   Allows a client to provide information sufficient for
+/// either directly contacting a principal (such as a telephone number
+/// or Email URI), or for discovering the principal (such as the URL
+/// of a homepage) who created a lock.  The value provided MUST be
+/// treated as a dead property in terms of XML Information Item
+/// preservation.  The server MUST NOT alter the value unless the
+/// owner value provided by the client is empty.  For a certain amount
+/// of interoperability between different client implementations, if
+/// clients have URI-formatted contact information for the lock
+/// creator suitable for user display, then clients SHOULD put those
+/// URIs in 'href' child elements of the 'owner' element.
+///
+/// Extensibility:   MAY be extended with child elements, mixed content,
+/// text content or attributes.
+///
+/// <!ELEMENT owner ANY >
+//@FIXME might need support for an extension
+#[derive(Debug, PartialEq, Clone)]
+pub enum Owner {
+    Txt(String),
+    Href(Href),
+    Unknown,
+}
+
+/// 14.18.  prop XML Element
+///
+/// Name:   prop
+///
+/// Purpose:   Contains properties related to a resource.
+///
+/// Description:   A generic container for properties defined on
+/// resources.  All elements inside a 'prop' XML element MUST define
+/// properties related to the resource, although possible property
+/// names are in no way limited to those property names defined in
+/// this document or other standards.  This element MUST NOT contain
+/// text or mixed content.
+///
+/// <!ELEMENT prop ANY >
+#[derive(Debug, PartialEq, Clone)]
+pub struct PropName<E: Extension>(pub Vec<PropertyRequest<E>>);
+
+#[derive(Debug, PartialEq, Clone)]
+pub struct PropValue<E: Extension>(pub Vec<Property<E>>);
+
+#[derive(Debug, PartialEq, Clone)]
+pub struct AnyProp<E: Extension>(pub Vec<AnyProperty<E>>);
+
+/// 14.19.  propertyupdate XML Element
+///
+/// Name:   propertyupdate
+///
+/// Purpose:   Contains a request to alter the properties on a resource.
+///
+/// Description:   This XML element is a container for the information
+/// required to modify the properties on the resource.
+///
+/// <!ELEMENT propertyupdate (remove | set)+ >
+#[derive(Debug, PartialEq, Clone)]
+pub struct PropertyUpdate<E: Extension>(pub Vec<PropertyUpdateItem<E>>);
+
+#[derive(Debug, PartialEq, Clone)]
+pub enum PropertyUpdateItem<E: Extension> {
+    Remove(Remove<E>),
+    Set(Set<E>),
+}
+
+/// 14.2 allprop XML Element
+///
+/// Name:   allprop
+///
+/// Purpose:   Specifies that all names and values of dead properties and
+/// the live properties defined by this document existing on the
+/// resource are to be returned.
+///
+/// <!ELEMENT allprop EMPTY >
+///
+/// ---
+///
+/// 14.21.  propname XML Element
+///
+/// Name:   propname
+///
+/// Purpose:   Specifies that only a list of property names on the
+/// resource is to be returned.
+///
+/// <!ELEMENT propname EMPTY >
+///
+/// ---
+///
+/// 14.20.  propfind XML Element
+///
+/// Name:   propfind
+///
+/// Purpose:   Specifies the properties to be returned from a PROPFIND
+/// method.  Four special elements are specified for use with
+/// 'propfind': 'prop', 'allprop', 'include', and 'propname'.  If
+/// 'prop' is used inside 'propfind', it MUST NOT contain property
+/// values.
+///
+/// <!ELEMENT propfind ( propname | (allprop, include?) | prop ) >
+#[derive(Debug, PartialEq, Clone)]
+pub enum PropFind<E: Extension> {
+    PropName,
+    AllProp(Option<Include<E>>),
+    Prop(PropName<E>),
+}
+
+/// 14.22 propstat XML Element
+///
+/// Name:   propstat
+///
+/// Purpose:   Groups together a prop and status element that is
+/// associated with a particular 'href' element.
+///
+/// Description:   The propstat XML element MUST contain one prop XML
+/// element and one status XML element.  The contents of the prop XML
+/// element MUST only list the names of properties to which the result
+/// in the status element applies.  The optional precondition/
+/// postcondition element and 'responsedescription' text also apply to
+/// the properties named in 'prop'.
+///
+/// <!ELEMENT propstat (prop, status, error?, responsedescription?) >
+///
+/// ---
+///
+///
+#[derive(Debug, PartialEq, Clone)]
+pub struct PropStat<E: Extension> {
+    pub prop: AnyProp<E>,
+    pub status: Status,
+    pub error: Option<Error<E>>,
+    pub responsedescription: Option<ResponseDescription>,
+}
+
+/// 14.23.  remove XML Element
+///
+/// Name:   remove
+///
+/// Purpose:   Lists the properties to be removed from a resource.
+///
+/// Description:   Remove instructs that the properties specified in prop
+/// should be removed.  Specifying the removal of a property that does
+/// not exist is not an error.  All the XML elements in a 'prop' XML
+/// element inside of a 'remove' XML element MUST be empty, as only
+/// the names of properties to be removed are required.
+///
+/// <!ELEMENT remove (prop) >
+#[derive(Debug, PartialEq, Clone)]
+pub struct Remove<E: Extension>(pub PropName<E>);
+
+/// 14.24.  response XML Element
+///
+/// Name:   response
+///
+/// Purpose:   Holds a single response describing the effect of a method
+/// on resource and/or its properties.
+///
+/// Description:   The 'href' element contains an HTTP URL pointing to a
+/// WebDAV resource when used in the 'response' container.  A
+/// particular 'href' value MUST NOT appear more than once as the
+/// child of a 'response' XML element under a 'multistatus' XML
+/// element.  This requirement is necessary in order to keep
+/// processing costs for a response to linear time.  Essentially, this
+/// prevents having to search in order to group together all the
+/// responses by 'href'.  There are, however, no requirements
+/// regarding ordering based on 'href' values.  The optional
+/// precondition/postcondition element and 'responsedescription' text
+/// can provide additional information about this resource relative to
+/// the request or result.
+///
+/// <!ELEMENT response (href, ((href*, status)|(propstat+)),
+///                     error?, responsedescription? , location?) >
+///
+/// --- rewritten as ---
+/// <!ELEMENT response ((href+, status)|(href, propstat+), error?, responsedescription?, location?>
+#[derive(Debug, PartialEq, Clone)]
+pub enum StatusOrPropstat<E: Extension> {
+    // One status, multiple hrefs...
+    Status(Vec<Href>, Status),
+    // A single href, multiple properties...
+    PropStat(Href, Vec<PropStat<E>>),
+}
+
+#[derive(Debug, PartialEq, Clone)]
+pub struct Response<E: Extension> {
+    pub status_or_propstat: StatusOrPropstat<E>,
+    pub error: Option<Error<E>>,
+    pub responsedescription: Option<ResponseDescription>,
+    pub location: Option<Location>,
+}
+
+/// 14.25.  responsedescription XML Element
+///
+/// Name:   responsedescription
+///
+/// Purpose:   Contains information about a status response within a
+/// Multi-Status.
+///
+/// Description:   Provides information suitable to be presented to a
+/// user.
+///
+/// <!ELEMENT responsedescription (#PCDATA) >
+#[derive(Debug, PartialEq, Clone)]
+pub struct ResponseDescription(pub String);
+
+/// 14.26.  set XML Element
+///
+/// Name:   set
+///
+/// Purpose:   Lists the property values to be set for a resource.
+///
+/// Description:   The 'set' element MUST contain only a 'prop' element.
+/// The elements contained by the 'prop' element inside the 'set'
+/// element MUST specify the name and value of properties that are set
+/// on the resource identified by Request-URI.  If a property already
+/// exists, then its value is replaced.  Language tagging information
+/// appearing in the scope of the 'prop' element (in the "xml:lang"
+/// attribute, if present) MUST be persistently stored along with the
+/// property, and MUST be subsequently retrievable using PROPFIND.
+///
+/// <!ELEMENT set (prop) >
+#[derive(Debug, PartialEq, Clone)]
+pub struct Set<E: Extension>(pub PropValue<E>);
+
+/// 14.27.  shared XML Element
+///
+/// Name:   shared
+///
+/// Purpose:   Specifies a shared lock.
+///
+///
+/// <!ELEMENT shared EMPTY >
+#[derive(Debug, PartialEq, Clone)]
+pub struct Shared {}
+
+/// 14.28.  status XML Element
+///
+/// Name:   status
+///
+/// Purpose:   Holds a single HTTP status-line.
+///
+/// Value:   status-line (defined in Section 6.1 of [RFC2616])
+///
+/// <!ELEMENT status (#PCDATA) >
+//@FIXME: Better typing is possible with an enum for example
+#[derive(Debug, PartialEq, Clone)]
+pub struct Status(pub http::status::StatusCode);
+
+/// 14.29.  timeout XML Element
+///
+/// Name:   timeout
+///
+/// Purpose:   The number of seconds remaining before a lock expires.
+///
+/// Value:   TimeType (defined in Section 10.7)
+///
+///
+/// <!ELEMENT timeout (#PCDATA) >
+///
+/// TimeOut = "Timeout" ":" 1#TimeType
+/// TimeType = ("Second-" DAVTimeOutVal | "Infinite")
+///             ; No LWS allowed within TimeType
+/// DAVTimeOutVal = 1*DIGIT
+///
+/// Clients MAY include Timeout request headers in their LOCK requests.
+/// However, the server is not required to honor or even consider these
+/// requests.  Clients MUST NOT submit a Timeout request header with any
+/// method other than a LOCK method.
+///
+/// The "Second" TimeType specifies the number of seconds that will
+/// elapse between granting of the lock at the server, and the automatic
+/// removal of the lock.  The timeout value for TimeType "Second" MUST
+/// NOT be greater than 2^32-1.
+#[derive(Debug, PartialEq, Clone)]
+pub enum Timeout {
+    Seconds(u32),
+    Infinite,
+}
+
+/// 15.  DAV Properties
+///
+/// For DAV properties, the name of the property is also the same as the
+/// name of the XML element that contains its value.  In the section
+/// below, the final line of each section gives the element type
+/// declaration using the format defined in [REC-XML].  The "Value"
+/// field, where present, specifies further restrictions on the allowable
+/// contents of the XML element using BNF (i.e., to further restrict the
+/// values of a PCDATA element).
+///
+/// A protected property is one that cannot be changed with a PROPPATCH
+/// request.  There may be other requests that would result in a change
+/// to a protected property (as when a LOCK request affects the value of
+/// DAV:lockdiscovery).  Note that a given property could be protected on
+/// one type of resource, but not protected on another type of resource.
+///
+/// A computed property is one with a value defined in terms of a
+/// computation (based on the content and other properties of that
+/// resource, or even of some other resource).  A computed property is
+/// always a protected property.
+///
+/// COPY and MOVE behavior refers to local COPY and MOVE operations.
+///
+/// For properties defined based on HTTP GET response headers (DAV:get*),
+/// the header value could include LWS as defined in [RFC2616], Section
+/// 4.2.  Server implementors SHOULD strip LWS from these values before
+/// using as WebDAV property values.
+#[derive(Debug, PartialEq, Clone)]
+pub enum AnyProperty<E: Extension> {
+    Request(PropertyRequest<E>),
+    Value(Property<E>),
+}
+
+#[derive(Debug, PartialEq, Clone)]
+pub enum PropertyRequest<E: Extension> {
+    CreationDate,
+    DisplayName,
+    GetContentLanguage,
+    GetContentLength,
+    GetContentType,
+    GetEtag,
+    GetLastModified,
+    LockDiscovery,
+    ResourceType,
+    SupportedLock,
+    Extension(E::PropertyRequest),
+}
+
+#[derive(Debug, PartialEq, Clone)]
+pub enum Property<E: Extension> {
+    /// 15.1.  creationdate Property
+    ///
+    /// Name:   creationdate
+    ///
+    /// Purpose:   Records the time and date the resource was created.
+    ///
+    /// Value:   date-time (defined in [RFC3339], see the ABNF in Section
+    /// 5.6.)
+    ///
+    /// Protected:   MAY be protected.  Some servers allow DAV:creationdate
+    /// to be changed to reflect the time the document was created if that
+    /// is more meaningful to the user (rather than the time it was
+    /// uploaded).  Thus, clients SHOULD NOT use this property in
+    /// synchronization logic (use DAV:getetag instead).
+    ///
+    /// COPY/MOVE behavior:   This property value SHOULD be kept during a
+    /// MOVE operation, but is normally re-initialized when a resource is
+    /// created with a COPY.  It should not be set in a COPY.
+    ///
+    /// Description:   The DAV:creationdate property SHOULD be defined on all
+    /// DAV compliant resources.  If present, it contains a timestamp of
+    /// the moment when the resource was created.  Servers that are
+    /// incapable of persistently recording the creation date SHOULD
+    /// instead leave it undefined (i.e. report "Not Found").
+    ///
+    /// <!ELEMENT creationdate (#PCDATA) >
+    CreationDate(DateTime<FixedOffset>),
+
+    /// 15.2.  displayname Property
+    ///
+    /// Name:   displayname
+    ///
+    /// Purpose:   Provides a name for the resource that is suitable for
+    /// presentation to a user.
+    ///
+    /// Value:   Any text.
+    ///
+    /// Protected:   SHOULD NOT be protected.  Note that servers implementing
+    /// [RFC2518] might have made this a protected property as this is a
+    /// new requirement.
+    ///
+    /// COPY/MOVE behavior:   This property value SHOULD be preserved in COPY
+    /// and MOVE operations.
+    ///
+    /// Description:   Contains a description of the resource that is
+    /// suitable for presentation to a user.  This property is defined on
+    /// the resource, and hence SHOULD have the same value independent of
+    /// the Request-URI used to retrieve it (thus, computing this property
+    /// based on the Request-URI is deprecated).  While generic clients
+    /// might display the property value to end users, client UI designers
+    /// must understand that the method for identifying resources is still
+    /// the URL.  Changes to DAV:displayname do not issue moves or copies
+    /// to the server, but simply change a piece of meta-data on the
+    /// individual resource.  Two resources can have the same DAV:
+    /// displayname value even within the same collection.
+    ///
+    /// <!ELEMENT displayname (#PCDATA) >
+    DisplayName(String),
+
+    /// 15.3.  getcontentlanguage Property
+    ///
+    /// Name:   getcontentlanguage
+    ///
+    /// Purpose:   Contains the Content-Language header value (from Section
+    /// 14.12 of [RFC2616]) as it would be returned by a GET without
+    /// accept headers.
+    ///
+    /// Value:   language-tag (language-tag is defined in Section 3.10 of
+    /// [RFC2616])
+    ///
+    /// Protected:   SHOULD NOT be protected, so that clients can reset the
+    /// language.  Note that servers implementing [RFC2518] might have
+    /// made this a protected property as this is a new requirement.
+    ///
+    /// COPY/MOVE behavior:   This property value SHOULD be preserved in COPY
+    /// and MOVE operations.
+    ///
+    /// Description:   The DAV:getcontentlanguage property MUST be defined on
+    /// any DAV-compliant resource that returns the Content-Language
+    /// header on a GET.
+    ///
+    /// <!ELEMENT getcontentlanguage (#PCDATA) >
+    GetContentLanguage(String),
+
+    /// 15.4.  getcontentlength Property
+    ///
+    /// Name:   getcontentlength
+    ///
+    /// Purpose:   Contains the Content-Length header returned by a GET
+    /// without accept headers.
+    ///
+    /// Value:   See Section 14.13 of [RFC2616].
+    ///
+    /// Protected:   This property is computed, therefore protected.
+    ///
+    /// Description:   The DAV:getcontentlength property MUST be defined on
+    /// any DAV-compliant resource that returns the Content-Length header
+    /// in response to a GET.
+    ///
+    /// COPY/MOVE behavior:   This property value is dependent on the size of
+    /// the destination resource, not the value of the property on the
+    /// source resource.
+    ///
+    /// <!ELEMENT getcontentlength (#PCDATA) >
+    GetContentLength(u64),
+
+    /// 15.5.  getcontenttype Property
+    ///
+    /// Name:   getcontenttype
+    ///
+    /// Purpose:   Contains the Content-Type header value (from Section 14.17
+    /// of [RFC2616]) as it would be returned by a GET without accept
+    /// headers.
+    ///
+    /// Value:   media-type (defined in Section 3.7 of [RFC2616])
+    ///
+    /// Protected:   Potentially protected if the server prefers to assign
+    /// content types on its own (see also discussion in Section 9.7.1).
+    ///
+    /// COPY/MOVE behavior:   This property value SHOULD be preserved in COPY
+    /// and MOVE operations.
+    ///
+    /// Description:   This property MUST be defined on any DAV-compliant
+    /// resource that returns the Content-Type header in response to a
+    /// GET.
+    ///
+    /// <!ELEMENT getcontenttype (#PCDATA) >
+    GetContentType(String),
+
+    /// 15.6.  getetag Property
+    ///
+    /// Name:   getetag
+    ///
+    /// Purpose:   Contains the ETag header value (from Section 14.19 of
+    /// [RFC2616]) as it would be returned by a GET without accept
+    /// headers.
+    ///
+    /// Value:   entity-tag (defined in Section 3.11 of [RFC2616])
+    ///
+    /// Protected:  MUST be protected because this value is created and
+    /// controlled by the server.
+    ///
+    /// COPY/MOVE behavior:   This property value is dependent on the final
+    /// state of the destination resource, not the value of the property
+    /// on the source resource.  Also note the considerations in
+    /// Section 8.8.
+    ///
+    /// Description:   The getetag property MUST be defined on any DAV-
+    /// compliant resource that returns the Etag header.  Refer to Section
+    /// 3.11 of RFC 2616 for a complete definition of the semantics of an
+    /// ETag, and to Section 8.6 for a discussion of ETags in WebDAV.
+    ///
+    /// <!ELEMENT getetag (#PCDATA) >
+    GetEtag(String),
+
+    /// 15.7.  getlastmodified Property
+    ///
+    /// Name:   getlastmodified
+    ///
+    /// Purpose:   Contains the Last-Modified header value (from Section
+    /// 14.29 of [RFC2616]) as it would be returned by a GET method
+    /// without accept headers.
+    ///
+    /// Value:   rfc1123-date (defined in Section 3.3.1 of [RFC2616])
+    ///
+    /// Protected:   SHOULD be protected because some clients may rely on the
+    /// value for appropriate caching behavior, or on the value of the
+    /// Last-Modified header to which this property is linked.
+    ///
+    /// COPY/MOVE behavior:   This property value is dependent on the last
+    /// modified date of the destination resource, not the value of the
+    /// property on the source resource.  Note that some server
+    /// implementations use the file system date modified value for the
+    /// DAV:getlastmodified value, and this can be preserved in a MOVE
+    /// even when the HTTP Last-Modified value SHOULD change.  Note that
+    /// since [RFC2616] requires clients to use ETags where provided, a
+    /// server implementing ETags can count on clients using a much better
+    /// mechanism than modification dates for offline synchronization or
+    /// cache control.  Also note the considerations in Section 8.8.
+    ///
+    /// Description:   The last-modified date on a resource SHOULD only
+    /// reflect changes in the body (the GET responses) of the resource.
+    /// A change in a property only SHOULD NOT cause the last-modified
+    /// date to change, because clients MAY rely on the last-modified date
+    /// to know when to overwrite the existing body.  The DAV:
+    /// getlastmodified property MUST be defined on any DAV-compliant
+    /// resource that returns the Last-Modified header in response to a
+    /// GET.
+    ///
+    /// <!ELEMENT getlastmodified (#PCDATA) >
+    GetLastModified(DateTime<FixedOffset>),
+
+    /// 15.8.  lockdiscovery Property
+    ///
+    /// Name:   lockdiscovery
+    ///
+    /// Purpose:   Describes the active locks on a resource
+    ///
+    /// Protected:   MUST be protected.  Clients change the list of locks
+    /// through LOCK and UNLOCK, not through PROPPATCH.
+    ///
+    /// COPY/MOVE behavior:   The value of this property depends on the lock
+    /// state of the destination, not on the locks of the source resource.
+    /// Recall that locks are not moved in a MOVE operation.
+    ///
+    /// Description:   Returns a listing of who has a lock, what type of lock
+    /// he has, the timeout type and the time remaining on the timeout,
+    /// and the associated lock token.  Owner information MAY be omitted
+    /// if it is considered sensitive.  If there are no locks, but the
+    /// server supports locks, the property will be present but contain
+    /// zero 'activelock' elements.  If there are one or more locks, an
+    /// 'activelock' element appears for each lock on the resource.  This
+    /// property is NOT lockable with respect to write locks (Section 7).
+    ///
+    /// <!ELEMENT lockdiscovery (activelock)* >
+    LockDiscovery(Vec<ActiveLock>),
+
+    /// 15.9.  resourcetype Property
+    ///
+    /// Name:   resourcetype
+    ///
+    /// Purpose:   Specifies the nature of the resource.
+    ///
+    /// Protected:   SHOULD be protected.  Resource type is generally decided
+    /// through the operation creating the resource (MKCOL vs PUT), not by
+    /// PROPPATCH.
+    ///
+    /// COPY/MOVE behavior:   Generally a COPY/MOVE of a resource results in
+    /// the same type of resource at the destination.
+    ///
+    /// Description:   MUST be defined on all DAV-compliant resources.  Each
+    /// child element identifies a specific type the resource belongs to,
+    /// such as 'collection', which is the only resource type defined by
+    /// this specification (see Section 14.3).  If the element contains
+    /// the 'collection' child element plus additional unrecognized
+    /// elements, it should generally be treated as a collection.  If the
+    /// element contains no recognized child elements, it should be
+    /// treated as a non-collection resource.  The default value is empty.
+    /// This element MUST NOT contain text or mixed content.  Any custom
+    /// child element is considered to be an identifier for a resource
+    /// type.
+    ///
+    /// Example: (fictional example to show extensibility)
+    ///
+    ///   <x:resourcetype xmlns:x="DAV:">
+    ///       <x:collection/>
+    ///       <f:search-results xmlns:f="http://www.example.com/ns"/>
+    ///   </x:resourcetype>
+    ResourceType(Vec<ResourceType<E>>),
+
+    /// 15.10.  supportedlock Property
+    ///
+    /// Name:   supportedlock
+    ///
+    /// Purpose:   To provide a listing of the lock capabilities supported by
+    /// the resource.
+    ///
+    /// Protected:   MUST be protected.  Servers, not clients, determine what
+    /// lock mechanisms are supported.
+    /// COPY/MOVE behavior:   This property value is dependent on the kind of
+    /// locks supported at the destination, not on the value of the
+    /// property at the source resource.  Servers attempting to COPY to a
+    /// destination should not attempt to set this property at the
+    /// destination.
+    ///
+    /// Description:   Returns a listing of the combinations of scope and
+    /// access types that may be specified in a lock request on the
+    /// resource.  Note that the actual contents are themselves controlled
+    /// by access controls, so a server is not required to provide
+    /// information the client is not authorized to see.  This property is
+    /// NOT lockable with respect to write locks (Section 7).
+    ///
+    /// <!ELEMENT supportedlock (lockentry)* >
+    SupportedLock(Vec<LockEntry>),
+
+    /// Any extension
+    Extension(E::Property),
+}
+
+#[derive(Debug, PartialEq, Clone)]
+pub enum ResourceType<E: Extension> {
+    Collection,
+    Extension(E::ResourceType),
+}
diff --git a/aero-dav/src/versioningdecoder.rs b/aero-dav/src/versioningdecoder.rs
new file mode 100644
index 0000000..a0a3ddf
--- /dev/null
+++ b/aero-dav/src/versioningdecoder.rs
@@ -0,0 +1,132 @@
+use super::error::ParsingError;
+use super::types as dav;
+use super::versioningtypes::*;
+use super::xml::{IRead, QRead, Reader, DAV_URN};
+
+// -- extensions ---
+impl QRead<PropertyRequest> for PropertyRequest {
+    async fn qread(xml: &mut Reader<impl IRead>) -> Result<Self, ParsingError> {
+        if xml
+            .maybe_open(DAV_URN, "supported-report-set")
+            .await?
+            .is_some()
+        {
+            xml.close().await?;
+            return Ok(Self::SupportedReportSet);
+        }
+        return Err(ParsingError::Recoverable);
+    }
+}
+
+impl<E: dav::Extension> QRead<Property<E>> for Property<E> {
+    async fn qread(xml: &mut Reader<impl IRead>) -> Result<Self, ParsingError> {
+        if xml
+            .maybe_open_start(DAV_URN, "supported-report-set")
+            .await?
+            .is_some()
+        {
+            let supported_reports = xml.collect().await?;
+            xml.close().await?;
+            return Ok(Property::SupportedReportSet(supported_reports));
+        }
+        Err(ParsingError::Recoverable)
+    }
+}
+
+impl<E: dav::Extension> QRead<SupportedReport<E>> for SupportedReport<E> {
+    async fn qread(xml: &mut Reader<impl IRead>) -> Result<Self, ParsingError> {
+        xml.open(DAV_URN, "supported-report").await?;
+        let r = xml.find().await?;
+        xml.close().await?;
+        Ok(SupportedReport(r))
+    }
+}
+
+impl<E: dav::Extension> QRead<ReportName<E>> for ReportName<E> {
+    async fn qread(xml: &mut Reader<impl IRead>) -> Result<Self, ParsingError> {
+        xml.open(DAV_URN, "report").await?;
+
+        let final_result = if xml.maybe_open(DAV_URN, "version-tree").await?.is_some() {
+            xml.close().await?;
+            Ok(ReportName::VersionTree)
+        } else if xml.maybe_open(DAV_URN, "expand-property").await?.is_some() {
+            xml.close().await?;
+            Ok(ReportName::ExpandProperty)
+        } else {
+            let x = match xml.maybe_find().await? {
+                Some(v) => v,
+                None => return Err(ParsingError::MissingChild),
+            };
+            Ok(ReportName::Extension(x))
+            //E::ReportTypeName::qread(xml).await.map(ReportName::Extension)
+        };
+
+        xml.close().await?;
+        final_result
+    }
+}
+
+impl<E: dav::Extension> QRead<Report<E>> for Report<E> {
+    async fn qread(xml: &mut Reader<impl IRead>) -> Result<Self, ParsingError> {
+        if xml.maybe_open(DAV_URN, "version-tree").await?.is_some() {
+            xml.close().await?;
+            tracing::warn!("version-tree is not implemented, skipping");
+            Ok(Report::VersionTree)
+        } else if xml.maybe_open(DAV_URN, "expand-property").await?.is_some() {
+            xml.close().await?;
+            tracing::warn!("expand-property is not implemented, skipping");
+            Ok(Report::ExpandProperty)
+        } else {
+            E::ReportType::qread(xml).await.map(Report::Extension)
+        }
+    }
+}
+
+impl QRead<Limit> for Limit {
+    async fn qread(xml: &mut Reader<impl IRead>) -> Result<Self, ParsingError> {
+        xml.open(DAV_URN, "limit").await?;
+        let nres = xml.find().await?;
+        xml.close().await?;
+        Ok(Limit(nres))
+    }
+}
+
+impl QRead<NResults> for NResults {
+    async fn qread(xml: &mut Reader<impl IRead>) -> Result<Self, ParsingError> {
+        xml.open(DAV_URN, "nresults").await?;
+        let sz = xml.tag_string().await?.parse::<u64>()?;
+        xml.close().await?;
+        Ok(NResults(sz))
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::xml::Node;
+
+    async fn deserialize<T: Node<T>>(src: &str) -> T {
+        let mut rdr = Reader::new(quick_xml::NsReader::from_reader(src.as_bytes()))
+            .await
+            .unwrap();
+        rdr.find().await.unwrap()
+    }
+
+    #[tokio::test]
+    async fn nresults() {
+        let expected = NResults(100);
+        let src = r#"<D:nresults xmlns:D="DAV:">100</D:nresults>"#;
+        let got = deserialize::<NResults>(src).await;
+        assert_eq!(got, expected);
+    }
+
+    #[tokio::test]
+    async fn limit() {
+        let expected = Limit(NResults(1024));
+        let src = r#"<D:limit xmlns:D="DAV:">
+            <D:nresults>1024</D:nresults>
+        </D:limit>"#;
+        let got = deserialize::<Limit>(src).await;
+        assert_eq!(got, expected);
+    }
+}
diff --git a/aero-dav/src/versioningencoder.rs b/aero-dav/src/versioningencoder.rs
new file mode 100644
index 0000000..c061f07
--- /dev/null
+++ b/aero-dav/src/versioningencoder.rs
@@ -0,0 +1,143 @@
+use quick_xml::events::{BytesText, Event};
+use quick_xml::Error as QError;
+
+use super::types::Extension;
+use super::versioningtypes::*;
+use super::xml::{IWrite, QWrite, Writer};
+
+// --- extensions to PROP
+impl QWrite for PropertyRequest {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        match self {
+            Self::SupportedReportSet => {
+                let start = xml.create_dav_element("supported-report-set");
+                xml.q.write_event_async(Event::Empty(start)).await
+            }
+        }
+    }
+}
+
+impl<E: Extension> QWrite for Property<E> {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        match self {
+            Self::SupportedReportSet(set) => {
+                let start = xml.create_dav_element("supported-report-set");
+                let end = start.to_end();
+
+                xml.q.write_event_async(Event::Start(start.clone())).await?;
+                for v in set.iter() {
+                    v.qwrite(xml).await?;
+                }
+                xml.q.write_event_async(Event::End(end)).await
+            }
+        }
+    }
+}
+
+impl<E: Extension> QWrite for SupportedReport<E> {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        let start = xml.create_dav_element("supported-report");
+        let end = start.to_end();
+        xml.q.write_event_async(Event::Start(start.clone())).await?;
+        self.0.qwrite(xml).await?;
+        xml.q.write_event_async(Event::End(end)).await
+    }
+}
+
+impl<E: Extension> QWrite for ReportName<E> {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        let start = xml.create_dav_element("report");
+        let end = start.to_end();
+
+        xml.q.write_event_async(Event::Start(start.clone())).await?;
+        match self {
+            Self::VersionTree => {
+                let start = xml.create_dav_element("version-tree");
+                xml.q.write_event_async(Event::Empty(start)).await?;
+            }
+            Self::ExpandProperty => {
+                let start = xml.create_dav_element("expand-property");
+                xml.q.write_event_async(Event::Empty(start)).await?;
+            }
+            Self::Extension(ext) => ext.qwrite(xml).await?,
+        };
+        xml.q.write_event_async(Event::End(end)).await
+    }
+}
+
+// --- root REPORT object ---
+impl<E: Extension> QWrite for Report<E> {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        match self {
+            Report::VersionTree => unimplemented!(),
+            Report::ExpandProperty => unimplemented!(),
+            Report::Extension(inner) => inner.qwrite(xml).await,
+        }
+    }
+}
+
+// --- limit REPORT parameter ---
+impl QWrite for Limit {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        let start = xml.create_dav_element("limit");
+        let end = start.to_end();
+
+        xml.q.write_event_async(Event::Start(start.clone())).await?;
+        self.0.qwrite(xml).await?;
+        xml.q.write_event_async(Event::End(end)).await
+    }
+}
+
+impl QWrite for NResults {
+    async fn qwrite(&self, xml: &mut Writer<impl IWrite>) -> Result<(), QError> {
+        let start = xml.create_dav_element("nresults");
+        let end = start.to_end();
+
+        xml.q.write_event_async(Event::Start(start.clone())).await?;
+        xml.q
+            .write_event_async(Event::Text(BytesText::new(&format!("{}", self.0))))
+            .await?;
+        xml.q.write_event_async(Event::End(end)).await
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::xml::Node;
+    use crate::xml::Reader;
+    use tokio::io::AsyncWriteExt;
+
+    async fn serialize_deserialize<T: Node<T>>(src: &T) -> T {
+        let mut buffer = Vec::new();
+        let mut tokio_buffer = tokio::io::BufWriter::new(&mut buffer);
+        let q = quick_xml::writer::Writer::new_with_indent(&mut tokio_buffer, b' ', 4);
+        let ns_to_apply = vec![
+            ("xmlns:D".into(), "DAV:".into()),
+            ("xmlns:C".into(), "urn:ietf:params:xml:ns:caldav".into()),
+        ];
+        let mut writer = Writer { q, ns_to_apply };
+
+        src.qwrite(&mut writer).await.expect("xml serialization");
+        tokio_buffer.flush().await.expect("tokio buffer flush");
+        let got = std::str::from_utf8(buffer.as_slice()).unwrap();
+
+        // deserialize
+        let mut rdr = Reader::new(quick_xml::NsReader::from_reader(got.as_bytes()))
+            .await
+            .unwrap();
+        rdr.find().await.unwrap()
+    }
+
+    #[tokio::test]
+    async fn nresults() {
+        let orig = NResults(100);
+        assert_eq!(orig, serialize_deserialize(&orig).await);
+    }
+
+    #[tokio::test]
+    async fn limit() {
+        let orig = Limit(NResults(1024));
+        assert_eq!(orig, serialize_deserialize(&orig).await);
+    }
+}
diff --git a/aero-dav/src/versioningtypes.rs b/aero-dav/src/versioningtypes.rs
new file mode 100644
index 0000000..1f8d1cf
--- /dev/null
+++ b/aero-dav/src/versioningtypes.rs
@@ -0,0 +1,59 @@
+use super::types as dav;
+
+//@FIXME required for a full DAV implementation
+// See section 7.1 of the CalDAV RFC
+// It seems it's mainly due to the fact that the REPORT method is re-used.
+// https://datatracker.ietf.org/doc/html/rfc4791#section-7.1
+//
+// Defines (required by CalDAV):
+// - REPORT method
+// - expand-property root report method
+//
+// Defines (required by Sync):
+// - limit, nresults
+// - supported-report-set
+
+// This property identifies the reports that are supported by the
+// resource.
+//
+// <!ELEMENT supported-report-set (supported-report*)>
+// <!ELEMENT supported-report report>
+// <!ELEMENT report ANY>
+// ANY value: a report element type
+
+#[derive(Debug, PartialEq, Clone)]
+pub enum PropertyRequest {
+    SupportedReportSet,
+}
+
+#[derive(Debug, PartialEq, Clone)]
+pub enum Property<E: dav::Extension> {
+    SupportedReportSet(Vec<SupportedReport<E>>),
+}
+
+#[derive(Debug, PartialEq, Clone)]
+pub struct SupportedReport<E: dav::Extension>(pub ReportName<E>);
+
+#[derive(Debug, PartialEq, Clone)]
+pub enum ReportName<E: dav::Extension> {
+    VersionTree,
+    ExpandProperty,
+    Extension(E::ReportTypeName),
+}
+
+#[derive(Debug, PartialEq, Clone)]
+pub enum Report<E: dav::Extension> {
+    VersionTree,    // Not yet implemented
+    ExpandProperty, // Not yet implemented
+    Extension(E::ReportType),
+}
+
+/// Limit
+/// <!ELEMENT limit         (nresults) >
+#[derive(Debug, PartialEq, Clone)]
+pub struct Limit(pub NResults);
+
+/// NResults
+/// <!ELEMENT nresults      (#PCDATA) >
+#[derive(Debug, PartialEq, Clone)]
+pub struct NResults(pub u64);
diff --git a/aero-dav/src/xml.rs b/aero-dav/src/xml.rs
new file mode 100644
index 0000000..e59f136
--- /dev/null
+++ b/aero-dav/src/xml.rs
@@ -0,0 +1,367 @@
+use futures::Future;
+use quick_xml::events::{BytesStart, Event};
+use quick_xml::name::ResolveResult;
+use quick_xml::reader::NsReader;
+use tokio::io::{AsyncBufRead, AsyncWrite};
+
+use super::error::ParsingError;
+
+// Constants
+pub const DAV_URN: &[u8] = b"DAV:";
+pub const CAL_URN: &[u8] = b"urn:ietf:params:xml:ns:caldav";
+pub const CARD_URN: &[u8] = b"urn:ietf:params:xml:ns:carddav";
+
+// Async traits
+pub trait IWrite = AsyncWrite + Unpin + Send;
+pub trait IRead = AsyncBufRead + Unpin;
+
+// Serialization/Deserialization traits
+pub trait QWrite {
+    fn qwrite(
+        &self,
+        xml: &mut Writer<impl IWrite>,
+    ) -> impl Future<Output = Result<(), quick_xml::Error>> + Send;
+}
+pub trait QRead<T> {
+    fn qread(xml: &mut Reader<impl IRead>) -> impl Future<Output = Result<T, ParsingError>>;
+}
+
+// The representation of an XML node in Rust
+pub trait Node<T> = QRead<T> + QWrite + std::fmt::Debug + PartialEq + Clone + Sync;
+
+// ---------------
+
+/// Transform a Rust object into an XML stream of characters
+pub struct Writer<T: IWrite> {
+    pub q: quick_xml::writer::Writer<T>,
+    pub ns_to_apply: Vec<(String, String)>,
+}
+impl<T: IWrite> Writer<T> {
+    pub fn create_dav_element(&mut self, name: &str) -> BytesStart<'static> {
+        self.create_ns_element("D", name)
+    }
+    pub fn create_cal_element(&mut self, name: &str) -> BytesStart<'static> {
+        self.create_ns_element("C", name)
+    }
+
+    fn create_ns_element(&mut self, ns: &str, name: &str) -> BytesStart<'static> {
+        let mut start = BytesStart::new(format!("{}:{}", ns, name));
+        if !self.ns_to_apply.is_empty() {
+            start.extend_attributes(
+                self.ns_to_apply
+                    .iter()
+                    .map(|(k, n)| (k.as_str(), n.as_str())),
+            );
+            self.ns_to_apply.clear()
+        }
+        start
+    }
+}
+
+/// Transform an XML stream of characters into a Rust object
+pub struct Reader<T: IRead> {
+    pub rdr: NsReader<T>,
+    cur: Event<'static>,
+    prev: Event<'static>,
+    parents: Vec<Event<'static>>,
+    buf: Vec<u8>,
+}
+impl<T: IRead> Reader<T> {
+    pub async fn new(mut rdr: NsReader<T>) -> Result<Self, ParsingError> {
+        let mut buf: Vec<u8> = vec![];
+        let cur = rdr.read_event_into_async(&mut buf).await?.into_owned();
+        let parents = vec![];
+        let prev = Event::Eof;
+        buf.clear();
+        Ok(Self {
+            cur,
+            prev,
+            parents,
+            rdr,
+            buf,
+        })
+    }
+
+    /// read one more tag
+    /// do not expose it publicly
+    async fn next(&mut self) -> Result<Event<'static>, ParsingError> {
+        let evt = self
+            .rdr
+            .read_event_into_async(&mut self.buf)
+            .await?
+            .into_owned();
+        self.buf.clear();
+        self.prev = std::mem::replace(&mut self.cur, evt);
+        Ok(self.prev.clone())
+    }
+
+    /// skip a node at current level
+    /// I would like to make this one private but not ready
+    pub async fn skip(&mut self) -> Result<Event<'static>, ParsingError> {
+        //println!("skipping inside node {:?} value {:?}", self.parents.last(), self.cur);
+        match &self.cur {
+            Event::Start(b) => {
+                let _span = self
+                    .rdr
+                    .read_to_end_into_async(b.to_end().name(), &mut self.buf)
+                    .await?;
+                self.next().await
+            }
+            Event::End(_) => Err(ParsingError::WrongToken),
+            Event::Eof => Err(ParsingError::Eof),
+            _ => self.next().await,
+        }
+    }
+
+    /// check if this is the desired tag
+    fn is_tag(&self, ns: &[u8], key: &str) -> bool {
+        let qname = match self.peek() {
+            Event::Start(bs) | Event::Empty(bs) => bs.name(),
+            Event::End(be) => be.name(),
+            _ => return false,
+        };
+
+        let (extr_ns, local) = self.rdr.resolve_element(qname);
+
+        if local.into_inner() != key.as_bytes() {
+            return false;
+        }
+
+        match extr_ns {
+            ResolveResult::Bound(v) => v.into_inner() == ns,
+            _ => false,
+        }
+    }
+
+    pub fn parent_has_child(&self) -> bool {
+        matches!(self.parents.last(), Some(Event::Start(_)) | None)
+    }
+
+    fn ensure_parent_has_child(&self) -> Result<(), ParsingError> {
+        match self.parent_has_child() {
+            true => Ok(()),
+            false => Err(ParsingError::Recoverable),
+        }
+    }
+
+    pub fn peek(&self) -> &Event<'static> {
+        &self.cur
+    }
+
+    pub fn previous(&self) -> &Event<'static> {
+        &self.prev
+    }
+
+    // NEW API
+    pub async fn tag_string(&mut self) -> Result<String, ParsingError> {
+        self.ensure_parent_has_child()?;
+
+        let mut acc = String::new();
+        loop {
+            match self.peek() {
+                Event::CData(unescaped) => {
+                    acc.push_str(std::str::from_utf8(unescaped.as_ref())?);
+                    self.next().await?
+                }
+                Event::Text(escaped) => {
+                    acc.push_str(escaped.unescape()?.as_ref());
+                    self.next().await?
+                }
+                Event::End(_) | Event::Start(_) | Event::Empty(_) => return Ok(acc),
+                _ => self.next().await?,
+            };
+        }
+    }
+
+    pub async fn maybe_read<N: Node<N>>(
+        &mut self,
+        t: &mut Option<N>,
+        dirty: &mut bool,
+    ) -> Result<(), ParsingError> {
+        if !self.parent_has_child() {
+            return Ok(());
+        }
+
+        match N::qread(self).await {
+            Ok(v) => {
+                *t = Some(v);
+                *dirty = true;
+                Ok(())
+            }
+            Err(ParsingError::Recoverable) => Ok(()),
+            Err(e) => Err(e),
+        }
+    }
+
+    pub async fn maybe_push<N: Node<N>>(
+        &mut self,
+        t: &mut Vec<N>,
+        dirty: &mut bool,
+    ) -> Result<(), ParsingError> {
+        if !self.parent_has_child() {
+            return Ok(());
+        }
+
+        match N::qread(self).await {
+            Ok(v) => {
+                t.push(v);
+                *dirty = true;
+                Ok(())
+            }
+            Err(ParsingError::Recoverable) => Ok(()),
+            Err(e) => Err(e),
+        }
+    }
+
+    pub async fn find<N: Node<N>>(&mut self) -> Result<N, ParsingError> {
+        self.ensure_parent_has_child()?;
+
+        loop {
+            // Try parse
+            match N::qread(self).await {
+                Err(ParsingError::Recoverable) => (),
+                otherwise => return otherwise,
+            }
+
+            // If recovered, skip the element
+            self.skip().await?;
+        }
+    }
+
+    pub async fn maybe_find<N: Node<N>>(&mut self) -> Result<Option<N>, ParsingError> {
+        // We can't find anything inside a self-closed tag
+        if !self.parent_has_child() {
+            return Ok(None);
+        }
+
+        loop {
+            // Try parse
+            match N::qread(self).await {
+                Err(ParsingError::Recoverable) => (),
+                otherwise => return otherwise.map(Some),
+            }
+
+            // Skip or stop
+            match self.peek() {
+                Event::End(_) => return Ok(None),
+                _ => self.skip().await?,
+            };
+        }
+    }
+
+    pub async fn collect<N: Node<N>>(&mut self) -> Result<Vec<N>, ParsingError> {
+        let mut acc = Vec::new();
+        if !self.parent_has_child() {
+            return Ok(acc);
+        }
+
+        loop {
+            match N::qread(self).await {
+                Err(ParsingError::Recoverable) => match self.peek() {
+                    Event::End(_) => return Ok(acc),
+                    _ => {
+                        self.skip().await?;
+                    }
+                },
+                Ok(v) => acc.push(v),
+                Err(e) => return Err(e),
+            }
+        }
+    }
+
+    pub async fn open(&mut self, ns: &[u8], key: &str) -> Result<Event<'static>, ParsingError> {
+        //println!("try open tag {:?}, on {:?}", key, self.peek());
+        let evt = match self.peek() {
+            Event::Empty(_) if self.is_tag(ns, key) => {
+                // hack to make `prev_attr` works
+                // here we duplicate the current tag
+                // as in other words, we virtually moved one token
+                // which is useful for prev_attr and any logic based on
+                // self.prev + self.open() on empty nodes
+                self.prev = self.cur.clone();
+                self.cur.clone()
+            }
+            Event::Start(_) if self.is_tag(ns, key) => self.next().await?,
+            _ => return Err(ParsingError::Recoverable),
+        };
+
+        //println!("open tag {:?}", evt);
+        self.parents.push(evt.clone());
+        Ok(evt)
+    }
+
+    pub async fn open_start(
+        &mut self,
+        ns: &[u8],
+        key: &str,
+    ) -> Result<Event<'static>, ParsingError> {
+        //println!("try open start tag {:?}, on {:?}", key, self.peek());
+        let evt = match self.peek() {
+            Event::Start(_) if self.is_tag(ns, key) => self.next().await?,
+            _ => return Err(ParsingError::Recoverable),
+        };
+
+        //println!("open start tag {:?}", evt);
+        self.parents.push(evt.clone());
+        Ok(evt)
+    }
+
+    pub async fn maybe_open(
+        &mut self,
+        ns: &[u8],
+        key: &str,
+    ) -> Result<Option<Event<'static>>, ParsingError> {
+        match self.open(ns, key).await {
+            Ok(v) => Ok(Some(v)),
+            Err(ParsingError::Recoverable) => Ok(None),
+            Err(e) => Err(e),
+        }
+    }
+
+    pub async fn maybe_open_start(
+        &mut self,
+        ns: &[u8],
+        key: &str,
+    ) -> Result<Option<Event<'static>>, ParsingError> {
+        match self.open_start(ns, key).await {
+            Ok(v) => Ok(Some(v)),
+            Err(ParsingError::Recoverable) => Ok(None),
+            Err(e) => Err(e),
+        }
+    }
+
+    pub fn prev_attr(&self, attr: &str) -> Option<String> {
+        match &self.prev {
+            Event::Start(bs) | Event::Empty(bs) => match bs.try_get_attribute(attr) {
+                Ok(Some(attr)) => attr
+                    .decode_and_unescape_value(&self.rdr)
+                    .ok()
+                    .map(|v| v.into_owned()),
+                _ => None,
+            },
+            _ => None,
+        }
+    }
+
+    // find stop tag
+    pub async fn close(&mut self) -> Result<Event<'static>, ParsingError> {
+        //println!("close tag {:?}", self.parents.last());
+
+        // Handle the empty case
+        if !self.parent_has_child() {
+            self.parents.pop();
+            return self.next().await;
+        }
+
+        // Handle the start/end case
+        loop {
+            match self.peek() {
+                Event::End(_) => {
+                    self.parents.pop();
+                    return self.next().await;
+                }
+                _ => self.skip().await?,
+            };
+        }
+    }
+}