diff --git a/crates/caldav/src/calendar/resource.rs b/crates/caldav/src/calendar/resource.rs
index fd16cad..eba73aa 100644
--- a/crates/caldav/src/calendar/resource.rs
+++ b/crates/caldav/src/calendar/resource.rs
@@ -93,7 +93,6 @@ impl DavPushExtension for CalendarResource {
 }
 
 impl Resource for CalendarResource {
-    type PropName = CalendarPropWrapperName;
     type Prop = CalendarPropWrapper;
     type Error = Error;
     type PrincipalResource = PrincipalResource;
@@ -119,7 +118,7 @@ impl Resource for CalendarResource {
         &self,
         rmap: &ResourceMap,
         user: &User,
-        prop: &Self::PropName,
+        prop: &CalendarPropWrapperName,
     ) -> Result<Self::Prop, Self::Error> {
         Ok(match prop {
             CalendarPropWrapperName::Calendar(prop) => CalendarPropWrapper::Calendar(match prop {
@@ -230,7 +229,7 @@ impl Resource for CalendarResource {
         }
     }
 
-    fn remove_prop(&mut self, prop: &Self::PropName) -> Result<(), rustical_dav::Error> {
+    fn remove_prop(&mut self, prop: &CalendarPropWrapperName) -> Result<(), rustical_dav::Error> {
         if self.read_only {
             return Err(rustical_dav::Error::PropReadOnly);
         }
diff --git a/crates/caldav/src/calendar_object/resource.rs b/crates/caldav/src/calendar_object/resource.rs
index d7aed71..e5f7770 100644
--- a/crates/caldav/src/calendar_object/resource.rs
+++ b/crates/caldav/src/calendar_object/resource.rs
@@ -52,7 +52,6 @@ pub struct CalendarObjectResource {
 }
 
 impl Resource for CalendarObjectResource {
-    type PropName = CalendarObjectPropWrapperName;
     type Prop = CalendarObjectPropWrapper;
     type Error = Error;
     type PrincipalResource = PrincipalResource;
@@ -65,7 +64,7 @@ impl Resource for CalendarObjectResource {
         &self,
         rmap: &ResourceMap,
         user: &User,
-        prop: &Self::PropName,
+        prop: &CalendarObjectPropWrapperName,
     ) -> Result<Self::Prop, Self::Error> {
         Ok(match prop {
             CalendarObjectPropWrapperName::CalendarObject(prop) => {
diff --git a/crates/caldav/src/calendar_set/mod.rs b/crates/caldav/src/calendar_set/mod.rs
index 33edf19..bbd1918 100644
--- a/crates/caldav/src/calendar_set/mod.rs
+++ b/crates/caldav/src/calendar_set/mod.rs
@@ -24,7 +24,6 @@ pub enum PrincipalPropWrapper {
 }
 
 impl Resource for CalendarSetResource {
-    type PropName = PrincipalPropWrapperName;
     type Prop = PrincipalPropWrapper;
     type Error = Error;
     type PrincipalResource = PrincipalResource;
@@ -40,7 +39,7 @@ impl Resource for CalendarSetResource {
         &self,
         rmap: &ResourceMap,
         user: &User,
-        prop: &Self::PropName,
+        prop: &PrincipalPropWrapperName,
     ) -> Result<Self::Prop, Self::Error> {
         Ok(match prop {
             PrincipalPropWrapperName::Common(prop) => PrincipalPropWrapper::Common(
diff --git a/crates/caldav/src/principal/mod.rs b/crates/caldav/src/principal/mod.rs
index 81b5793..bb419b7 100644
--- a/crates/caldav/src/principal/mod.rs
+++ b/crates/caldav/src/principal/mod.rs
@@ -59,7 +59,6 @@ impl NamedRoute for PrincipalResource {
 }
 
 impl Resource for PrincipalResource {
-    type PropName = PrincipalPropWrapperName;
     type Prop = PrincipalPropWrapper;
     type Error = Error;
     type PrincipalResource = PrincipalResource;
@@ -75,7 +74,7 @@ impl Resource for PrincipalResource {
         &self,
         rmap: &ResourceMap,
         user: &User,
-        prop: &Self::PropName,
+        prop: &PrincipalPropWrapperName,
     ) -> Result<Self::Prop, Self::Error> {
         let principal_url = Self::get_url(rmap, vec![&self.principal]).unwrap();
         let home_set = CalendarHomeSet(
diff --git a/crates/carddav/src/address_object/resource.rs b/crates/carddav/src/address_object/resource.rs
index 631b808..aec88d3 100644
--- a/crates/carddav/src/address_object/resource.rs
+++ b/crates/carddav/src/address_object/resource.rs
@@ -48,7 +48,6 @@ pub struct AddressObjectResource {
 }
 
 impl Resource for AddressObjectResource {
-    type PropName = AddressObjectPropWrapperName;
     type Prop = AddressObjectPropWrapper;
     type Error = Error;
     type PrincipalResource = PrincipalResource;
@@ -61,7 +60,7 @@ impl Resource for AddressObjectResource {
         &self,
         rmap: &ResourceMap,
         user: &User,
-        prop: &Self::PropName,
+        prop: &AddressObjectPropWrapperName,
     ) -> Result<Self::Prop, Self::Error> {
         Ok(match prop {
             AddressObjectPropWrapperName::AddressObject(prop) => {
diff --git a/crates/carddav/src/addressbook/resource.rs b/crates/carddav/src/addressbook/resource.rs
index 6ce8172..54dc685 100644
--- a/crates/carddav/src/addressbook/resource.rs
+++ b/crates/carddav/src/addressbook/resource.rs
@@ -81,7 +81,6 @@ impl DavPushExtension for AddressbookResource {
 }
 
 impl Resource for AddressbookResource {
-    type PropName = AddressbookPropWrapperName;
     type Prop = AddressbookPropWrapper;
     type Error = Error;
     type PrincipalResource = PrincipalResource;
@@ -97,7 +96,7 @@ impl Resource for AddressbookResource {
         &self,
         rmap: &ResourceMap,
         user: &User,
-        prop: &Self::PropName,
+        prop: &AddressbookPropWrapperName,
     ) -> Result<Self::Prop, Self::Error> {
         Ok(match prop {
             AddressbookPropWrapperName::Addressbook(prop) => {
@@ -153,7 +152,10 @@ impl Resource for AddressbookResource {
         }
     }
 
-    fn remove_prop(&mut self, prop: &Self::PropName) -> Result<(), rustical_dav::Error> {
+    fn remove_prop(
+        &mut self,
+        prop: &AddressbookPropWrapperName,
+    ) -> Result<(), rustical_dav::Error> {
         match prop {
             AddressbookPropWrapperName::Addressbook(prop) => match prop {
                 AddressbookPropName::Displayname => {
diff --git a/crates/carddav/src/principal/mod.rs b/crates/carddav/src/principal/mod.rs
index 1ba29c4..d20610c 100644
--- a/crates/carddav/src/principal/mod.rs
+++ b/crates/carddav/src/principal/mod.rs
@@ -64,7 +64,6 @@ impl NamedRoute for PrincipalResource {
 }
 
 impl Resource for PrincipalResource {
-    type PropName = PrincipalPropWrapperName;
     type Prop = PrincipalPropWrapper;
     type Error = Error;
     type PrincipalResource = PrincipalResource;
@@ -80,7 +79,7 @@ impl Resource for PrincipalResource {
         &self,
         rmap: &ResourceMap,
         user: &User,
-        prop: &Self::PropName,
+        prop: &PrincipalPropWrapperName,
     ) -> Result<Self::Prop, Self::Error> {
         let principal_href = HrefElement::new(Self::get_principal_url(rmap, &self.principal));
 
diff --git a/crates/dav/src/resource/methods/proppatch.rs b/crates/dav/src/resource/methods/proppatch.rs
index 66fd75d..0579bb4 100644
--- a/crates/dav/src/resource/methods/proppatch.rs
+++ b/crates/dav/src/resource/methods/proppatch.rs
@@ -11,6 +11,7 @@ use actix_web::{web::Path, HttpRequest};
 use itertools::Itertools;
 use quick_xml::name::Namespace;
 use rustical_store::auth::User;
+use rustical_xml::EnumUnitVariants;
 use rustical_xml::Unparsed;
 use rustical_xml::XmlDeserialize;
 use rustical_xml::XmlDocument;
@@ -97,7 +98,7 @@ pub(crate) async fn route_proppatch<R: ResourceService>(
             }) => {
                 match property {
                     SetPropertyPropWrapper::Valid(prop) => {
-                        let propname: <R::Resource as Resource>::PropName = prop.clone().into();
+                        let propname: <<R::Resource as Resource>::Prop as EnumUnitVariants>::UnitVariants = prop.clone().into();
                         let (ns, propname): (Option<Namespace>, &str) = propname.into();
                         match resource.set_prop(prop) {
                             Ok(()) => props_ok.push((ns, propname.to_owned())),
@@ -127,7 +128,9 @@ pub(crate) async fn route_proppatch<R: ResourceService>(
             }
             Operation::Remove(remove_el) => {
                 let propname = remove_el.prop.0 .0;
-                match <<R::Resource as Resource>::PropName as FromStr>::from_str(&propname) {
+                match <<R::Resource as Resource>::Prop as EnumUnitVariants>::UnitVariants::from_str(
+                    &propname,
+                ) {
                     Ok(prop) => match resource.remove_prop(&prop) {
                         Ok(()) => props_ok.push((None, propname)),
                         Err(Error::PropReadOnly) => props_conflict.push((None, propname)),
diff --git a/crates/dav/src/resource/mod.rs b/crates/dav/src/resource/mod.rs
index 02ff5c0..a5f4bd0 100644
--- a/crates/dav/src/resource/mod.rs
+++ b/crates/dav/src/resource/mod.rs
@@ -9,7 +9,7 @@ use itertools::Itertools;
 use quick_xml::name::Namespace;
 pub use resource_service::ResourceService;
 use rustical_store::auth::User;
-use rustical_xml::{EnumVariants, XmlDeserialize, XmlSerialize};
+use rustical_xml::{EnumUnitVariants, EnumVariants, XmlDeserialize, XmlSerialize};
 use std::str::FromStr;
 
 mod methods;
@@ -24,10 +24,7 @@ pub trait ResourcePropName: FromStr {}
 impl<T: FromStr> ResourcePropName for T {}
 
 pub trait Resource: Clone + 'static {
-    type PropName: ResourcePropName
-        + From<Self::Prop>
-        + Into<(Option<Namespace<'static>>, &'static str)>;
-    type Prop: ResourceProp + PartialEq + Clone + EnumVariants;
+    type Prop: ResourceProp + PartialEq + Clone + EnumVariants + EnumUnitVariants;
     type Error: ResponseError + From<crate::Error>;
     type PrincipalResource: Resource + NamedRoute;
 
@@ -41,14 +38,17 @@ pub trait Resource: Clone + 'static {
         &self,
         rmap: &ResourceMap,
         user: &User,
-        prop: &Self::PropName,
+        prop: &<Self::Prop as EnumUnitVariants>::UnitVariants,
     ) -> Result<Self::Prop, Self::Error>;
 
     fn set_prop(&mut self, _prop: Self::Prop) -> Result<(), crate::Error> {
         Err(crate::Error::PropReadOnly)
     }
 
-    fn remove_prop(&mut self, _prop: &Self::PropName) -> Result<(), crate::Error> {
+    fn remove_prop(
+        &mut self,
+        _prop: &<Self::Prop as EnumUnitVariants>::UnitVariants,
+    ) -> Result<(), crate::Error> {
         Err(crate::Error::PropReadOnly)
     }
 
@@ -106,7 +106,7 @@ pub trait Resource: Clone + 'static {
         let mut valid_props = vec![];
         let mut invalid_props = vec![];
         for prop in props {
-            if let Ok(valid_prop) = Self::PropName::from_str(prop) {
+            if let Ok(valid_prop) = <Self::Prop as EnumUnitVariants>::UnitVariants::from_str(prop) {
                 valid_props.push(valid_prop);
             } else {
                 invalid_props.push(prop.to_string())
diff --git a/crates/dav/src/resources/root.rs b/crates/dav/src/resources/root.rs
index ebef506..deed6ab 100644
--- a/crates/dav/src/resources/root.rs
+++ b/crates/dav/src/resources/root.rs
@@ -19,7 +19,6 @@ impl<PR: Resource> Default for RootResource<PR> {
 }
 
 impl<PR: Resource + NamedRoute> Resource for RootResource<PR> {
-    type PropName = CommonPropertiesPropName;
     type Prop = CommonPropertiesProp;
     type Error = PR::Error;
     type PrincipalResource = PR;
@@ -35,7 +34,7 @@ impl<PR: Resource + NamedRoute> Resource for RootResource<PR> {
         &self,
         rmap: &ResourceMap,
         user: &User,
-        prop: &Self::PropName,
+        prop: &CommonPropertiesPropName,
     ) -> Result<Self::Prop, Self::Error> {
         CommonPropertiesExtension::get_prop(self, rmap, user, prop)
     }
diff --git a/crates/xml/src/lib.rs b/crates/xml/src/lib.rs
index 9eca8cf..d55f6b0 100644
--- a/crates/xml/src/lib.rs
+++ b/crates/xml/src/lib.rs
@@ -1,5 +1,6 @@
 use quick_xml::name::Namespace;
 use std::collections::HashMap;
+use std::str::FromStr;
 
 pub mod de;
 mod error;
@@ -34,6 +35,6 @@ pub trait EnumVariants {
     fn variant_names() -> Vec<(Option<Namespace<'static>>, &'static str)>;
 }
 
-pub trait EnumUnitVariants {
-    type UnitVariants;
+pub trait EnumUnitVariants: Sized {
+    type UnitVariants: Into<(Option<Namespace<'static>>, &'static str)> + From<Self> + FromStr;
 }