[Zope] Path to an Object

Another simple question. I'm having trouble getting the path to an object. The ZB says the REQUEST object has a BASE0 attribute but I do not know the syntax of the call to get it. I've tried <dtml-var "REQUEST.base0"> which fails. What am I missing? Any chance that the online ZB can be updated to include examples in the API reference? Thanks in advance. ___________________ Tim Owen