trap for any exception

Hi there,

I'd like to build a PL/pgSQL function which is able to generic trap any 
error, and interpret it.

I read 37.7.5. Trapping Errors, but the syntax requires to write explicitly 
the exception condition, and not a generic one.

Is it possible to build a generic trap or do you know a workaround for that 
?

TIA,
Sabin