Perform an action on schema drop

[Kieran McCusker <kieran(dot)mccusker(at)kwest(dot)info>]

Hi

We use schemas to partition the database into client jobs, with public 
tables knowing about client.  I would like to
update the public tables if we remove a schema but cannot find a way to 
do it - I have tried triggers (not allowed)
and a delete rule but all to no avail.

Is this possible?

Many Thanks

Kieran