[Zope] How to clean a vocabulary

[Rogerio Atem de Carvalho]

Hi,

do vocabulary objects delete a word that is not referenced anymore (I don=
=B4t=20
think so)?
If not, how can I programatically clean a vocabulary object inside a ZCat=
alog,=20
I mean, delete all (or some specific) words that are not in use anymore?

One more question:
is there a size limit or number of objects limit one can store in a folde=
r=20
hierarchy, or the limit for Zope is only the data.fs limit?

regards,

Rogerio Atem