[Zope] Subclass folder using Z Classes?

Is there a way to create folder-like (ie., container) classes using Z Classes? (I'm using Zope 1.11.) -- Alexander Staubo http://www.mop.no/~alex/ "`This must be Thursday,' said Arthur to himself, sinking low over his beer, `I never could get the hang of Thursdays.'" --Douglas Adams, _The Hitchhiker's Guide to the Galaxy_