request for sql3 compliance for the update command

I have a large customer who is converting from informix to postgres and
they have made extensive use of

update table set (col...) = ( val...)

as a first pass would it be possible to translate this in the parser to

update table set col=val

It would appear that this is SQL3 compliant

<set clause> ::=
<update target> <equals operator> <row value designator>

<update target> ::=
<object column>
| <left paren> <object column list> <right paren>

or can someone think of another way?
--
Dave Cramer <dave(at)fastcrypt(dot)com>
Cramer Consulting