Pavel,

>  o User can specify SQLSTATE only from class 'U1'
>  o Default values for SQLSTATE usr excpt are from class 'U0'
>  o Every exception's variable has unique SQLSTATE
>  o User's exception or system's exception can be raised only with
>    level EXCEPTION
>
> Any comments, notes?

Looks great to me, pending a code examination.   Will it also be possible to 
query the SQLSTATE/ERRSTRING  inside the EXCEPTION clause?   i.e.

WHEN OTHERS THEN
        RAISE NOTICE '%',sqlstate;
        ROLLBACK;

That's something missing from 8.0 exception handling that makes it hard to 
improve SPs with better error messages.

-- 
Josh Berkus
Aglio Database Solutions
San Francisco

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