Re: [Zope] changing ZClass bases

but the obvious reading is that once you've defined a ZClass you cannot add, remove, or replace any of its base classes.

Is this true? Or does it just mean "not through the techniques being discussed in that part of the book"?

Although I've never done it, I understand that there is a (very much unsupported) way to change the base classes of a ZClass. There's a Howto on zope.org about it at http://www.zope.org/Members/AlexR/ChangingBaseClasses There is also dicussion about it somewhere on the list. --jcc (kaboom!)