Re: [Zope-dev] Sets

Chris McDonough wrote:

There are also set objects like OOSets and IISets that can be used in intersection and union operations as documented in the BTrees module.

I never understood the documentation :-( What's the difference between an OOSet and and IISet? (I think i know the answer to that one but thought I'd check...) Do things like IOSets and OISets exist, if so, what are they? cheers, Chris