[Zope] Metadata indexing

[Fabio Rolando]

Hi.
I am trying to use Zcatalog to index and search documents through their 
metadata.
All my documents must be provided some additional properties (metadata) and 
the search engine should be able to index and use this additional 
properties to select the documents. Is this possible with the Zope's search 
engine. Could you help me understanding how to do it?
Please, forgive me if this question sounds silly to some expert users, but 
I'm quite confused about how to use the Zcatalog functionalities because I 
did not find any updated document (I am using zope 2.6) that could help me 
understanding how it works.
Thank you