Use XMLObject as a superclass.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@13866 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/Document/Machine.py

@@ -27,8 +27,9 @@
 ##############################################################################
 
 from Products.ERP5Type import Permissions, PropertySheet, Constraint, Interface
+from Products.ERP5Type.XMLObject import XMLObject
 
-class Machine:
+class Machine(XMLObject):
 
     add_permission = Permissions.AddPortalContent
     meta_type = 'ERP5 Machine'