diff --git a/info.textgrid.middleware.tgauth.rbac/ldap-schemas/textgrid.schema b/info.textgrid.middleware.tgauth.rbac/ldap-schemas/textgrid.schema
index 684148ed5a28f7117621272cee4d5b9e35aa1e1c..9fb65738a7850c1191740cf0adf7ac6e30426ed1 100644
--- a/info.textgrid.middleware.tgauth.rbac/ldap-schemas/textgrid.schema
+++ b/info.textgrid.middleware.tgauth.rbac/ldap-schemas/textgrid.schema
@@ -104,13 +104,21 @@ attributetype ( 1.3.6.1.4.1.10126.1.35.3.14
 	SYNTAX 1.3.6.1.4.1.1466.115.121.1.15 )
 
 
+attributetype ( 1.3.6.1.4.1.10126.1.35.3.15
+        NAME 'TGResourceUUID'
+        DESC 'UUID of TextGrid Resource, optional'
+        EQUALITY caseIgnoreMatch
+        SUBSTR caseIgnoreSubstringsMatch
+        SYNTAX 1.3.6.1.4.1.1466.115.121.1.15 )
+
+
 objectclass ( 1.3.6.1.4.1.10126.1.35.4.1
 	NAME 'TextGridResource'
 	DESC 'Main ObjectClass of a TextGrid resource'
 	SUP top
 	STRUCTURAL
 	MUST ( TGResourceURI $ TGisPublic $ TGProjectId )
-	MAY ( TGResourceOwner $ TGisProjectFile ) )
+	MAY ( TGResourceOwner $ TGisProjectFile $ TGResourceUUID ) )
 
 objectclass ( 1.3.6.1.4.1.10126.1.35.4.2
 	NAME 'TextGridProject'