--- a/schemas/base.py	Tue Mar 02 15:43:26 2010 +0100
+++ b/schemas/base.py	Tue Mar 02 15:44:26 2010 +0100
@@ -118,18 +118,21 @@
 
 class creation_date(RelationType):
     """creation time of an entity"""
+    __permissions__ = PUB_SYSTEM_ATTR_PERMS
     cardinality = '11'
     subject = '*'
     object = 'Datetime'
 
 class modification_date(RelationType):
     """latest modification time of an entity"""
+    __permissions__ = PUB_SYSTEM_ATTR_PERMS
     cardinality = '11'
     subject = '*'
     object = 'Datetime'
 
 class cwuri(RelationType):
     """internal entity uri"""
+    __permissions__ = PUB_SYSTEM_ATTR_PERMS
     cardinality = '11'
     subject = '*'
     object = 'String'