question/problem concerning GRANT/REVOKE

[Gerhard Wohlgenannt <wohlg(at)ai(dot)wu-wien(dot)ac(dot)at>]

hi!

I have a pretty basic problem: We have several schemas in one of our 
databases, and we need the users to see only the tables (and table 
structure) of tables inside their own schema.  So I created schemas for 
those users, and set their "search_path".

But with \d public.<tab key> users can see all tables (and their 
structure) in the public (and other) schemas -- and I found no way yet 
to prevent this?? 

I have tried "REVOKE ALL" from the database itself, and the other 
schemas, and single tables -- for the specific user, and also for the 
user "PUBLIC" -- but it had no effect!
How can I prevent exposing the structure of all tables in the database 
to user that should work in their SCHEMA?

Help would be appreciated very much!! :-)

cheers,
gerhard