diff --git a/crates/caldav/src/calendar/resource.rs b/crates/caldav/src/calendar/resource.rs
index 177a07a..c0c1e81 100644
--- a/crates/caldav/src/calendar/resource.rs
+++ b/crates/caldav/src/calendar/resource.rs
@@ -19,7 +19,6 @@ use rustical_dav::extensions::{
 };
 use rustical_dav::privileges::UserPrivilegeSet;
 use rustical_dav::resource::{InvalidProperty, Resource, ResourceService};
-use rustical_dav::xml::HrefElement;
 use rustical_store::auth::User;
 use rustical_store::{Calendar, CalendarStore};
 use serde::{Deserialize, Serialize};
@@ -37,7 +36,6 @@ pub struct CalendarResourceService<C: CalendarStore + ?Sized> {
 #[derive(EnumString, VariantNames, Clone, From, TryInto)]
 #[strum(serialize_all = "kebab-case")]
 pub enum CalendarPropName {
-    Owner,
     Displayname,
     CalendarColor,
     CalendarDescription,
@@ -63,9 +61,6 @@ pub enum CalendarProp {
     Displayname(Option<String>),
     Getcontenttype(String),
 
-    // WebDAV Access Control (RFC 3744)
-    Owner(HrefElement),
-
     // CalDAV (RFC 4791)
     #[serde(rename = "IC:calendar-color", alias = "calendar-color")]
     CalendarColor(Option<String>),
@@ -126,14 +121,11 @@ impl Resource for CalendarResource {
 
     fn get_prop(
         &self,
-        rmap: &ResourceMap,
-        user: &User,
+        _rmap: &ResourceMap,
+        _user: &User,
         prop: &Self::PropName,
     ) -> Result<Self::Prop, Self::Error> {
         Ok(match prop {
-            CalendarPropName::Owner => CalendarProp::Owner(HrefElement::new(
-                PrincipalResource::get_url(rmap, vec![&self.0.principal]).unwrap(),
-            )),
             CalendarPropName::Displayname => CalendarProp::Displayname(self.0.displayname.clone()),
             CalendarPropName::CalendarColor => CalendarProp::CalendarColor(self.0.color.clone()),
             CalendarPropName::CalendarDescription => {
@@ -179,7 +171,6 @@ impl Resource for CalendarResource {
 
     fn set_prop(&mut self, prop: Self::Prop) -> Result<(), rustical_dav::Error> {
         match prop {
-            CalendarProp::Owner(_) => Err(rustical_dav::Error::PropReadOnly),
             CalendarProp::Displayname(displayname) => {
                 self.0.displayname = displayname;
                 Ok(())
@@ -217,7 +208,6 @@ impl Resource for CalendarResource {
 
     fn remove_prop(&mut self, prop: &Self::PropName) -> Result<(), rustical_dav::Error> {
         match prop {
-            CalendarPropName::Owner => Err(rustical_dav::Error::PropReadOnly),
             CalendarPropName::Displayname => {
                 self.0.displayname = None;
                 Ok(())
@@ -257,6 +247,10 @@ impl Resource for CalendarResource {
         "caldav_calendar"
     }
 
+    fn get_owner(&self) -> Option<&str> {
+        Some(&self.0.principal)
+    }
+
     fn get_user_privileges(&self, user: &User) -> Result<UserPrivilegeSet, Self::Error> {
         Ok(UserPrivilegeSet::owner_only(self.0.principal == user.id))
     }
diff --git a/crates/caldav/src/calendar_object/resource.rs b/crates/caldav/src/calendar_object/resource.rs
index da20616..dcffd8f 100644
--- a/crates/caldav/src/calendar_object/resource.rs
+++ b/crates/caldav/src/calendar_object/resource.rs
@@ -8,7 +8,6 @@ use rustical_dav::{
     extensions::{CommonPropertiesExtension, CommonPropertiesProp, CommonPropertiesPropName},
     privileges::UserPrivilegeSet,
     resource::{InvalidProperty, Resource, ResourceService},
-    xml::HrefElement,
 };
 use rustical_store::{auth::User, CalendarObject, CalendarStore};
 use serde::{Deserialize, Serialize};
@@ -29,7 +28,6 @@ pub enum CalendarObjectPropName {
     Getetag,
     CalendarData,
     Getcontenttype,
-    Owner,
     #[from]
     #[try_into]
     #[strum(disabled)]
@@ -47,9 +45,6 @@ pub enum CalendarObjectProp {
     #[serde(rename = "C:calendar-data")]
     CalendarData(String),
 
-    // WebDAV Access Control (RFC 3744)
-    Owner(HrefElement),
-
     #[serde(skip_deserializing, untagged)]
     #[from]
     #[try_into]
@@ -92,7 +87,7 @@ impl Resource for CalendarObjectResource {
 
     fn get_prop(
         &self,
-        rmap: &ResourceMap,
+        _rmap: &ResourceMap,
         _user: &User,
         prop: &Self::PropName,
     ) -> Result<Self::Prop, Self::Error> {
@@ -104,9 +99,6 @@ impl Resource for CalendarObjectResource {
             CalendarObjectPropName::Getcontenttype => {
                 CalendarObjectProp::Getcontenttype("text/calendar;charset=utf-8".to_owned())
             }
-            CalendarObjectPropName::Owner => CalendarObjectProp::Owner(
-                PrincipalResource::get_principal_url(rmap, &self.principal).into(),
-            ),
             _ => panic!("we shouldn't end up here"),
         })
     }
@@ -116,6 +108,10 @@ impl Resource for CalendarObjectResource {
         "caldav_calendar_object"
     }
 
+    fn get_owner(&self) -> Option<&str> {
+        Some(&self.principal)
+    }
+
     fn get_user_privileges(&self, user: &User) -> Result<UserPrivilegeSet, Self::Error> {
         Ok(UserPrivilegeSet::owner_only(self.principal == user.id))
     }
diff --git a/crates/caldav/src/principal/mod.rs b/crates/caldav/src/principal/mod.rs
index e3074b3..27e502e 100644
--- a/crates/caldav/src/principal/mod.rs
+++ b/crates/caldav/src/principal/mod.rs
@@ -38,16 +38,10 @@ pub struct Resourcetype {
 #[derive(Deserialize, Serialize, From, TryInto)]
 #[serde(rename_all = "kebab-case")]
 pub enum PrincipalProp {
-    // WebDAV (RFC 2518)
-    Resourcetype(Resourcetype),
-
     // WebDAV Access Control (RFC 3744)
     #[serde(rename = "principal-URL")]
     PrincipalUrl(HrefElement),
 
-    // WebDAV Access Control (RFC 3744)
-    Owner(HrefElement),
-
     // CalDAV (RFC 4791)
     #[serde(rename = "C:calendar-home-set")]
     CalendarHomeSet(HrefElement),
@@ -72,8 +66,6 @@ impl InvalidProperty for PrincipalProp {
 #[derive(EnumString, VariantNames, Clone, From, TryInto)]
 #[strum(serialize_all = "kebab-case")]
 pub enum PrincipalPropName {
-    Resourcetype,
-    Owner,
     #[strum(serialize = "principal-URL")]
     PrincipalUrl,
     CalendarHomeSet,
@@ -105,16 +97,12 @@ impl Resource for PrincipalResource {
     fn get_prop(
         &self,
         rmap: &ResourceMap,
-        user: &User,
+        _user: &User,
         prop: &Self::PropName,
     ) -> Result<Self::Prop, Self::Error> {
         let principal_href = HrefElement::new(Self::get_url(rmap, vec![&self.principal]).unwrap());
 
         Ok(match prop {
-            PrincipalPropName::Resourcetype => PrincipalProp::Resourcetype(Resourcetype::default()),
-            PrincipalPropName::Owner => PrincipalProp::Owner(HrefElement::new(
-                PrincipalResource::get_url(rmap, vec![&self.principal]).unwrap(),
-            )),
             PrincipalPropName::PrincipalUrl => PrincipalProp::PrincipalUrl(principal_href),
             PrincipalPropName::CalendarHomeSet => PrincipalProp::CalendarHomeSet(principal_href),
             PrincipalPropName::CalendarUserAddressSet => {
@@ -129,6 +117,10 @@ impl Resource for PrincipalResource {
         "caldav_principal"
     }
 
+    fn get_owner(&self) -> Option<&str> {
+        Some(&self.principal)
+    }
+
     fn get_user_privileges(&self, user: &User) -> Result<UserPrivilegeSet, Self::Error> {
         Ok(UserPrivilegeSet::owner_only(self.principal == user.id))
     }
diff --git a/crates/carddav/src/address_object/resource.rs b/crates/carddav/src/address_object/resource.rs
index 83bedac..d21b3c7 100644
--- a/crates/carddav/src/address_object/resource.rs
+++ b/crates/carddav/src/address_object/resource.rs
@@ -7,7 +7,6 @@ use rustical_dav::{
     extensions::{CommonPropertiesExtension, CommonPropertiesProp, CommonPropertiesPropName},
     privileges::UserPrivilegeSet,
     resource::{InvalidProperty, Resource, ResourceService},
-    xml::HrefElement,
 };
 use rustical_store::{auth::User, AddressObject, AddressbookStore};
 use serde::{Deserialize, Serialize};
@@ -30,7 +29,6 @@ pub enum AddressObjectPropName {
     Getetag,
     AddressData,
     Getcontenttype,
-    Owner,
     #[from]
     #[try_into]
     #[strum(disabled)]
@@ -44,13 +42,6 @@ pub enum AddressObjectProp {
     Getetag(String),
     Getcontenttype(String),
 
-    // WebDAV Current Principal Extension (RFC 5397)
-    CurrentUserPrincipal(HrefElement),
-
-    // WebDAV Access Control (RFC 3744)
-    Owner(HrefElement),
-    CurrentUserPrivilegeSet(UserPrivilegeSet),
-
     // CalDAV (RFC 4791)
     #[serde(rename = "CARD:address-data")]
     AddressData(String),
@@ -109,9 +100,6 @@ impl Resource for AddressObjectResource {
             AddressObjectPropName::Getcontenttype => {
                 AddressObjectProp::Getcontenttype("text/vcard;charset=utf-8".to_owned())
             }
-            AddressObjectPropName::Owner => AddressObjectProp::Owner(
-                PrincipalResource::get_principal_url(rmap, &self.principal).into(),
-            ),
             _ => panic!("we shouldn't end up here"),
         })
     }
@@ -121,6 +109,10 @@ impl Resource for AddressObjectResource {
         "carddav_address_object"
     }
 
+    fn get_owner(&self) -> Option<&str> {
+        Some(&self.principal)
+    }
+
     fn get_user_privileges(&self, user: &User) -> Result<UserPrivilegeSet, Self::Error> {
         Ok(UserPrivilegeSet::owner_only(self.principal == user.id))
     }
diff --git a/crates/carddav/src/addressbook/resource.rs b/crates/carddav/src/addressbook/resource.rs
index 6be9df5..5d28c26 100644
--- a/crates/carddav/src/addressbook/resource.rs
+++ b/crates/carddav/src/addressbook/resource.rs
@@ -16,7 +16,6 @@ use rustical_dav::extensions::{
 };
 use rustical_dav::privileges::UserPrivilegeSet;
 use rustical_dav::resource::{InvalidProperty, Resource, ResourceService};
-use rustical_dav::xml::HrefElement;
 use rustical_store::auth::User;
 use rustical_store::{Addressbook, AddressbookStore};
 use serde::{Deserialize, Serialize};
@@ -36,7 +35,6 @@ pub struct AddressbookResourceService<AS: AddressbookStore + ?Sized> {
 pub enum AddressbookPropName {
     Displayname,
     Getcontenttype,
-    Owner,
     AddressbookDescription,
     SupportedAddressData,
     SupportedReportSet,
@@ -55,9 +53,6 @@ pub enum AddressbookProp {
     Displayname(Option<String>),
     Getcontenttype(String),
 
-    // WebDAV Access Control (RFC 3744)
-    Owner(HrefElement),
-
     // CardDAV (RFC 6352)
     #[serde(
         rename = "CARD:addressbook-description",
@@ -110,14 +105,11 @@ impl Resource for AddressbookResource {
 
     fn get_prop(
         &self,
-        rmap: &ResourceMap,
-        user: &User,
+        _rmap: &ResourceMap,
+        _user: &User,
         prop: &Self::PropName,
     ) -> Result<Self::Prop, Self::Error> {
         Ok(match prop {
-            AddressbookPropName::Owner => AddressbookProp::Owner(
-                PrincipalResource::get_principal_url(rmap, &self.0.principal).into(),
-            ),
             AddressbookPropName::Displayname => {
                 AddressbookProp::Displayname(self.0.displayname.clone())
             }
@@ -142,7 +134,6 @@ impl Resource for AddressbookResource {
 
     fn set_prop(&mut self, prop: Self::Prop) -> Result<(), rustical_dav::Error> {
         match prop {
-            AddressbookProp::Owner(_) => Err(rustical_dav::Error::PropReadOnly),
             AddressbookProp::Displayname(displayname) => {
                 self.0.displayname = displayname;
                 Ok(())
@@ -164,7 +155,6 @@ impl Resource for AddressbookResource {
 
     fn remove_prop(&mut self, prop: &Self::PropName) -> Result<(), rustical_dav::Error> {
         match prop {
-            AddressbookPropName::Owner => Err(rustical_dav::Error::PropReadOnly),
             AddressbookPropName::Displayname => {
                 self.0.displayname = None;
                 Ok(())
@@ -188,6 +178,10 @@ impl Resource for AddressbookResource {
         "carddav_addressbook"
     }
 
+    fn get_owner(&self) -> Option<&str> {
+        Some(&self.0.principal)
+    }
+
     fn get_user_privileges(&self, user: &User) -> Result<UserPrivilegeSet, Self::Error> {
         Ok(UserPrivilegeSet::owner_only(self.0.principal == user.id))
     }
diff --git a/crates/carddav/src/principal/mod.rs b/crates/carddav/src/principal/mod.rs
index 06c5e2d..03039e3 100644
--- a/crates/carddav/src/principal/mod.rs
+++ b/crates/carddav/src/principal/mod.rs
@@ -51,7 +51,7 @@ pub enum PrincipalProp {
     #[serde(skip_deserializing, untagged)]
     #[from]
     #[try_into]
-    ExtRFC5397RFC3477(CommonPropertiesProp<PrincipalResource>),
+    ExtCommonProperties(CommonPropertiesProp<PrincipalResource>),
 
     #[serde(untagged)]
     Invalid,
@@ -73,7 +73,7 @@ pub enum PrincipalPropName {
     #[from]
     #[try_into]
     #[strum(disabled)]
-    ExtRFC5397(CommonPropertiesPropName),
+    ExtCommonProperties(CommonPropertiesPropName),
 }
 
 impl PrincipalResource {
@@ -97,7 +97,7 @@ impl Resource for PrincipalResource {
     fn get_prop(
         &self,
         rmap: &ResourceMap,
-        user: &User,
+        _user: &User,
         prop: &Self::PropName,
     ) -> Result<Self::Prop, Self::Error> {
         let principal_href = HrefElement::new(Self::get_principal_url(rmap, &self.principal));
@@ -117,6 +117,10 @@ impl Resource for PrincipalResource {
         "carddav_principal"
     }
 
+    fn get_owner(&self) -> Option<&str> {
+        Some(&self.principal)
+    }
+
     fn get_user_privileges(&self, user: &User) -> Result<UserPrivilegeSet, Self::Error> {
         Ok(UserPrivilegeSet::owner_only(self.principal == user.id))
     }
diff --git a/crates/dav/src/extensions/mod.rs b/crates/dav/src/extensions/mod.rs
index c5b7245..866d745 100644
--- a/crates/dav/src/extensions/mod.rs
+++ b/crates/dav/src/extensions/mod.rs
@@ -30,6 +30,7 @@ pub enum CommonPropertiesProp<R: Resource> {
 
     // WebDAV Access Control Protocol (RFC 3477)
     CurrentUserPrivilegeSet(UserPrivilegeSet),
+    Owner(Option<HrefElement>),
 
     #[serde(untagged)]
     Invalid,
@@ -47,6 +48,7 @@ pub enum CommonPropertiesPropName {
     Resourcetype,
     CurrentUserPrincipal,
     CurrentUserPrivilegeSet,
+    Owner,
 }
 
 impl<R: Resource, PR: Resource> ResourceExtension<R> for CommonPropertiesExtension<PR>
@@ -77,6 +79,11 @@ where
             CommonPropertiesPropName::CurrentUserPrivilegeSet => {
                 CommonPropertiesProp::CurrentUserPrivilegeSet(resource.get_user_privileges(user)?)
             }
+            CommonPropertiesPropName::Owner => CommonPropertiesProp::Owner(
+                resource
+                    .get_owner()
+                    .map(|owner| PR::get_url(rmap, &[owner]).unwrap().into()),
+            ),
         })
     }
 }
diff --git a/crates/dav/src/resource.rs b/crates/dav/src/resource.rs
index b71e574..13f2ca6 100644
--- a/crates/dav/src/resource.rs
+++ b/crates/dav/src/resource.rs
@@ -62,6 +62,10 @@ pub trait Resource: Clone {
 
     fn resource_name() -> &'static str;
 
+    fn get_owner(&self) -> Option<&str> {
+        None
+    }
+
     fn get_url<U, I>(rmap: &ResourceMap, elements: U) -> Result<String, UrlGenerationError>
     where
         U: IntoIterator<Item = I>,