[Zope3-dev] Zope3 design question

[rubberduckee]

Hi, I'm relatively new to Zope 3 (by have some Zope 2/ Plone
developement experience) and I'm need to get some light on some
architectural challenges that I'm currently faced with. 

I know that this might be too general a question (or perhaps a dumb
one) but I'm hoping that someone could help guide me in the right
direction. How does one go about designing an application that will
allow for dynamic schemas i.e. schemas built at run time? Users would
be able to 'extend' the schemas TTW. Would using a database be a
better option rather that to use ZopeDB or a marriage of both?

thanks
-ec