RE: [Zope] one 'document' in many 'folders'

Sorry to post a commercial plug here, but it seems in stride with my post from this weekend to another question (Collector). Basically, Z Tables would be a pretty perfect fit (IMHO). I realize that you too realize that (sort of), because you suggested going the ZSQL route. Clearly, there are similarities. But, Z Tables has already been independently benchmarked as _kicking a**_ performance-wise, and is also more closely aligned with the gestalt that you indicated you liked about the object database. Just a thought (and a few bucks, of course :-).