diff --git a/src/dav/calencoder.rs b/src/dav/calencoder.rs
index fbd696d..aabdf36 100644
--- a/src/dav/calencoder.rs
+++ b/src/dav/calencoder.rs
@@ -8,28 +8,6 @@ use quick_xml::writer::{ElementWriter, Writer};
 use quick_xml::name::PrefixDeclaration;
 use tokio::io::AsyncWrite;
 
-/*pub trait CalWriter<E: Extension>: DavWriter<E> {
-    fn create_cal_element(&mut self, name: &str) -> ElementWriter<impl AsyncWrite + Unpin>;
-}
-
-impl<'a, W: AsyncWrite+Unpin> DavWriter<CalExtension> for Writer<'a, W, CalExtension> {
-    fn create_dav_element(&mut self, name: &str) -> ElementWriter<impl AsyncWrite + Unpin> {
-        self.create_ns_element(name, Namespace::Dav)
-    }
-    fn child(w: &'a mut QWriter<W>) -> impl DavWriter<CalExtension> {
-        Self::child(w)
-    }
-    async fn error(&mut self, err: &Violation) -> Result<(), QError> {
-       err.write(self).await 
-    }
-}
-
-impl<'a, W: AsyncWrite+Unpin> CalWriter<CalExtension> for Writer<'a, W, CalExtension> {
-    fn create_cal_element(&mut self, name: &str) -> ElementWriter<impl AsyncWrite + Unpin> {
-        self.create_ns_element(name, Namespace::CalDav)
-    }
-}*/
-
 pub struct CalCtx {
     root: bool
 }
diff --git a/src/dav/caltypes.rs b/src/dav/caltypes.rs
index ed8496a..d913f95 100644
--- a/src/dav/caltypes.rs
+++ b/src/dav/caltypes.rs
@@ -1,25 +1,11 @@
 use super::types::*;
 
-pub enum Namespace {
-    Dav,
-    CalDav,
-}
 
 pub struct CalExtension {}
 impl Extension for CalExtension {
     type Error = Violation;
-    type Namespace = Namespace;
-
-    fn namespaces() -> &'static [(&'static str, &'static str)] {
-        return &[ ("D", "DAV:"), ("C", "urn:ietf:params:xml:ns:caldav") ][..]
-    }
-
-    fn short_ns(ns: Self::Namespace) -> &'static str {
-        match ns {
-            Namespace::Dav => "D",
-            Namespace::CalDav => "C",
-        }
-    }
+    type Property = Property;
+    type PropertyRequest = Property; //@FIXME
 }
 
 pub enum Violation {
@@ -39,3 +25,9 @@ pub enum Violation {
     ///                             param-filter*)>
     SupportedFilter,
 }
+
+
+pub enum Property {
+    CalendarDescription,
+    CalendarTimezone,
+}
diff --git a/src/dav/encoder.rs b/src/dav/encoder.rs
index e77e072..2c9fdac 100644
--- a/src/dav/encoder.rs
+++ b/src/dav/encoder.rs
@@ -149,16 +149,68 @@ impl<E: Extension, C: Context<E>> QuickWritable<E,C> for ResponseDescription {
 
 impl<E: Extension, C: Context<E>> QuickWritable<E,C> for Location {
     async fn write(&self, xml: &mut Writer<impl AsyncWrite+Unpin>, ctx: C) -> Result<(), QError> {
-        unimplemented!();
+        let start = ctx.create_dav_element("location");
+        let end = start.to_end();
+
+        xml.write_event_async(Event::Start(start.clone())).await?;
+        self.0.write(xml, ctx.child()).await?;
+        xml.write_event_async(Event::End(end)).await?;
+
+        Ok(())
     }
 }
 
 impl<E: Extension, C: Context<E>> QuickWritable<E,C> for PropStat<E> {
     async fn write(&self, xml: &mut Writer<impl AsyncWrite+Unpin>, ctx: C) -> Result<(), QError> {
-        unimplemented!();
+        let start = ctx.create_dav_element("propstat");
+        let end = start.to_end();
+
+        xml.write_event_async(Event::Start(start.clone())).await?;
+        self.prop.write(xml, ctx.child()).await?;
+        self.status.write(xml, ctx.child()).await?;
+        if let Some(error) = &self.error {
+            error.write(xml, ctx.child()).await?;
+        }
+        if let Some(description) = &self.responsedescription {
+            description.write(xml, ctx.child()).await?;
+        }
+        xml.write_event_async(Event::End(end)).await?;
+
+        Ok(())
     }
 }
 
+impl<E: Extension, C: Context<E>> QuickWritable<E,C> for Prop<E> {
+    async fn write(&self, xml: &mut Writer<impl AsyncWrite+Unpin>, ctx: C) -> Result<(), QError> {
+        let start = ctx.create_dav_element("prop");
+        let end = start.to_end();
+
+        xml.write_event_async(Event::Start(start.clone())).await?;
+        for property in &self.0 {
+            property.write(xml, ctx.child()).await?;
+        }
+        xml.write_event_async(Event::End(end)).await?;
+
+        Ok(())
+    }
+}
+
+
+impl<E: Extension, C: Context<E>> QuickWritable<E,C> for Property<E> {
+    async fn write(&self, xml: &mut Writer<impl AsyncWrite+Unpin>, ctx: C) -> Result<(), QError> {
+        use Property::*;
+        match self {
+            CreationDate(date) => unimplemented!(),
+            DisplayName(name) => unimplemented!(),
+            //@FIXME not finished
+            _ => unimplemented!(),
+        };
+        Ok(())
+    }
+}
+
+
+
 impl<E: Extension, C: Context<E>> QuickWritable<E,C> for Error<E> {
     async fn write(&self, xml: &mut Writer<impl AsyncWrite+Unpin>, ctx: C) -> Result<(), QError> {
         let start = ctx.create_dav_element("error");
diff --git a/src/dav/types.rs b/src/dav/types.rs
index 69ddf52..b0c0083 100644
--- a/src/dav/types.rs
+++ b/src/dav/types.rs
@@ -6,10 +6,8 @@ use chrono::{DateTime,FixedOffset};
 pub struct Disabled(());
 pub trait Extension {
     type Error;
-    type Namespace;
-
-    fn namespaces() -> &'static [(&'static str, &'static str)];
-    fn short_ns(ns: Self::Namespace) -> &'static str;
+    type Property;
+    type PropertyRequest;
 }
 
 /// No extension
@@ -19,16 +17,9 @@ pub enum Namespace {
 }
 impl Extension for NoExtension {
     type Error = Disabled;
-    type Namespace = Namespace;
-
-    fn namespaces() -> &'static [(&'static str, &'static str)] {
-        return &[ ("D", "DAV:") ][..]
-    }
-
-    fn short_ns(ns: Self::Namespace) -> &'static str {
-        "D"
-    }
-}
+    type Property = Disabled;
+    type PropertyRequest = Disabled;
+ }
 
 /// 14.1.  activelock XML Element
 ///
@@ -38,11 +29,11 @@ impl Extension for NoExtension {
 /// <!ELEMENT activelock (lockscope, locktype, depth, owner?, timeout?,
 ///           locktoken?, lockroot)>
 pub struct ActiveLock {
-    lockscope: LockScope,
-    locktype: LockType,
-    depth: Depth,
-    owner: Option<Owner>,
-    timeout: Option<Timeout>,
+    pub lockscope: LockScope,
+    pub locktype: LockType,
+    pub depth: Depth,
+    pub owner: Option<Owner>,
+    pub timeout: Option<Timeout>,
 }
 
 /// 14.2 allprop XML Element
@@ -225,7 +216,7 @@ pub struct Href(pub String);
 /// standards.  This element MUST NOT contain text or mixed content.
 ///
 /// <!ELEMENT include ANY >
-pub struct Include(Vec<Property>);
+pub struct Include<T: Extension>(pub Vec<Property<T>>);
 
 /// 14.9.  location XML Element
 ///
@@ -241,7 +232,7 @@ pub struct Include(Vec<Property>);
 /// that would be used in a Location header.
 ///
 /// <!ELEMENT location (href)>
-pub struct Location(Href);
+pub struct Location(pub Href);
 
 /// 14.10.  lockentry XML Element
 ///
@@ -252,8 +243,8 @@ pub struct Location(Href);
 ///
 /// <!ELEMENT lockentry (lockscope, locktype) >
 pub struct LockEntry {
-    lokscope: LockScope,
-    locktype: LockType,
+    pub lokscope: LockScope,
+    pub locktype: LockType,
 }
 
 /// 14.11.  lockinfo XML Element
@@ -265,9 +256,9 @@ pub struct LockEntry {
 ///
 /// <!ELEMENT lockinfo (lockscope, locktype, owner?)  >
 pub struct LockInfo {
-    lockscope: LockScope,
-    locktype: LockType,
-    owner: Option<Owner>,
+    pub lockscope: LockScope,
+    pub locktype: LockType,
+    pub owner: Option<Owner>,
 }
 
 /// 14.12.  lockroot XML Element
@@ -282,7 +273,7 @@ pub struct LockInfo {
 /// values and the response to LOCK requests.
 ///
 /// <!ELEMENT lockroot (href) >
-pub struct LockRoot(Href);
+pub struct LockRoot(pub Href);
 
 /// 14.13.  lockscope XML Element
 ///
@@ -369,7 +360,7 @@ pub struct Multistatus<T: Extension> {
 /// text content or attributes.
 ///
 /// <!ELEMENT owner ANY >
-pub struct Owner(String);
+pub struct Owner(pub String);
 
 /// 14.18.  prop XML Element
 ///
@@ -385,7 +376,7 @@ pub struct Owner(String);
 /// text or mixed content.
 ///
 /// <!ELEMENT prop ANY >
-pub struct Prop(Vec<Property>);
+pub struct Prop<T: Extension>(pub Vec<Property<T>>);
 
 /// 14.19.  propertyupdate XML Element
 ///
@@ -397,10 +388,10 @@ pub struct Prop(Vec<Property>);
 /// required to modify the properties on the resource.
 ///
 /// <!ELEMENT propertyupdate (remove | set)+ >
-pub struct PropertyUpdate(Vec<PropertyUpdateItem>);
-pub enum PropertyUpdateItem {
-    Remove(Remove),
-    Set(Set),
+pub struct PropertyUpdate<T: Extension>(Vec<PropertyUpdateItem<T>>);
+pub enum PropertyUpdateItem<T: Extension> {
+    Remove(Remove<T>),
+    Set(Set<T>),
 }
 
 /// 14.20.  propfind XML Element
@@ -414,10 +405,10 @@ pub enum PropertyUpdateItem {
 /// values.
 ///
 /// <!ELEMENT propfind ( propname | (allprop, include?) | prop ) >
-pub enum PropFind {
+pub enum PropFind<T: Extension> {
     PropName(PropName),
-    AllProp(AllProp, Option<Include>),
-    Prop(Prop),
+    AllProp(AllProp, Option<Include<T>>),
+    Prop(Prop<T>),
 }
 
 /// 14.21.  propname XML Element
@@ -446,10 +437,10 @@ pub struct PropName {}
 ///
 /// <!ELEMENT propstat (prop, status, error?, responsedescription?) >
 pub struct PropStat<T: Extension> {
-    prop: Prop,
-    status: Status,
-    error: Option<Error<T>>,
-    responsedescription: Option<ResponseDescription>,
+    pub prop: Prop<T>,
+    pub status: Status,
+    pub error: Option<Error<T>>,
+    pub responsedescription: Option<ResponseDescription>,
 }
 
 /// 14.23.  remove XML Element
@@ -465,7 +456,7 @@ pub struct PropStat<T: Extension> {
 /// the names of properties to be removed are required.
 ///
 /// <!ELEMENT remove (prop) >
-pub struct Remove(Prop);
+pub struct Remove<T: Extension>(pub Prop<T>);
 
 /// 14.24.  response XML Element
 ///
@@ -530,7 +521,7 @@ pub struct ResponseDescription(pub String);
 /// property, and MUST be subsequently retrievable using PROPFIND.
 ///
 /// <!ELEMENT set (prop) >
-pub struct Set(Prop);
+pub struct Set<T: Extension>(pub Prop<T>);
 
 /// 14.27.  shared XML Element
 ///
@@ -595,7 +586,7 @@ pub struct Timeout(u64);
 /// 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.
-pub enum PropertyRequest {
+pub enum PropertyRequest<T: Extension> {
     CreationDate,
     DisplayName,
     GetContentLanguage,
@@ -606,8 +597,9 @@ pub enum PropertyRequest {
     LockDiscovery,
     ResourceType,
     SupportedLock,
+    Extension(T::PropertyRequest),
 }
-pub enum Property {
+pub enum Property<T: Extension> {
     /// 15.1.  creationdate Property
     ///
     /// Name:   creationdate
@@ -884,6 +876,9 @@ pub enum Property {
     ///
     /// <!ELEMENT supportedlock (lockentry)* >
     SupportedLock(Vec<LockEntry>),
+
+    /// Any extension
+    Extension(T::Property),
 }