[Zope] Adding mixin class does not work with Python 2.2/Zope 2.5.1

I have a class that overrides the __bobo_traverse__ method to put parts of the URL into request variables. I'm not sure when it broke, but it isn't working in my Python 2.2/Zope 2.5.1 setup. A simple example that breaks is as follows: from OFS.Folder import Folder class TraversableObject: pass class TraversableFolder(TraversableObject, Folder): pass I get an error message about an empty or missing docstring even when putting an empty class in front of Folder in the superclass list. Does anyone know how to fix this? Kevin Smith Kevin.Smith@sas.com