[Zope] zcatalog and versions

[Oliver Bleutgen]

Can somenone briefly explain what exactly gets 
locked in zope 2.3,3's catalog when it tries to
index an object which is hold in a version?
The whole catalog?

I found some answers which indicate that it has
to do with the catalog when we see version lock errors
where there shouldn't be any (from a naive pov),
but I would like to know how far reaching these problems
are, because when doing a rewrite of that application,
I might be able to work around that.

Do these problems still persist in zope 2.4.x?

cheers,
oliver