[Zope] How to make a Python Product Class a BaseClass for ZClasses

hello everyone, how can I make a python product ZClass like ZPickle and so on a BaseClass for ZClasses. I know I have to write context.registerBaseClass(ZPickle.ZPickle). But that alone will not do it. Can someone help me, please? cheers, stephan -- Stephan Richter iXL - Software Designer and Engineer CBU - Physics, Computer Science and Chemistry Student