[Zope] Zclass inheritence

[Chris McDonough]

> What does a product need to do in order to be a base class 
> for a ZClass?

It needs contain a class that is registered as a base class in the
product's __init__.py "initialize()" method via
"context.registerBaseClass()"

e.g.     context.registerBaseClass(ZCatalog.ZCatalog)

See lib/python/Products/ZCatalog/__init__.py for an example...

> Can another Zclass act as a base class for a ZClass?
> If not, why not?

Yep.  Try it.  :-)