Added Virtual.

lib/python/OFS/PropertySheets.py

@@ -84,7 +84,7 @@
 ##############################################################################
 
 """Property sheets"""
-__version__='$Revision: 1.3 $'[11:-2]
+__version__='$Revision: 1.4 $'[11:-2]
 
 import time, string, App.Management
 from ZPublisher.Converters import type_converters
@@ -342,9 +342,15 @@ class PropertySheet(Persistent, Implicit):
             return self.manage_propertiesForm(self, REQUEST)
 
 
+class Virtual:
 
+    def __init__(self):
+        pass
+    
+    def v_self(self):
+        return self.aq_parent.aq_parent
 
-class DefaultProperties(PropertySheet):
+class DefaultProperties(Virtual, PropertySheet):
     """The default property set mimics the behavior of old-style Zope
        properties -- it stores its property values in the instance of
        its owner."""
@@ -352,14 +358,8 @@ class DefaultProperties(PropertySheet):
     id='default'
     md={'xmlns': 'http://www.zope.org/propsets/default'}
 
-    def __init__(self):
-        pass
-    
-    def v_self(self):
-        return self.aq_parent.aq_parent
-
 
-class DAVProperties(PropertySheet):
+class DAVProperties(Virtual, PropertySheet):
     """WebDAV properties"""
 
     id='webdav'
@@ -373,12 +373,6 @@ class DAVProperties(PropertySheet):
         {'id':'source',           'mode':'r'},
         )
 
-    def __init__(self):
-        pass
-    
-    def v_self(self):
-        return self.aq_parent.aq_parent
-
     def hasProperty(self, id):
         return self.dav__propmap.has_key(id)