Transactions in rules..

Can i use transactions in rules??
I was trying something like:

create rule x_test as
on insert to view1
do instead
(
begin;
insert into test1 values (new.a,new.b);
insert into test2 values (new.c,new.d);
commit;
);

But when i give this command in psql i always get an error..

Regards

fabrizio(at)macrongolf(dot)com
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