[Zope] Database indexing using Z Catalog

[Honey George]

Hello,
	I am not able to find a way to index and external
database say PostgreSQL using Z Catalogs and search
the contents. Can anybody help me in this. I couldn't
find a complete documentation in the zope site. It
will be helpfull to me if somebody can explain to me
using an example.

Regards,
   Honey

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