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