Unique indices and inheritance

Greetings.

In the following situation:
create table foo (id int4);
create table bar (val int4) inherits(foo);
Is it possible to create a unique index such that no record in either
foo or bar (in other words, in foo*) has a duplicated id? I tried what
seemed to be most obvious to me by doing:
create unique index foo_pkey on foo*(id);
but it caused a syntax error. Creating a unique index on just foo
allows duplicates between the two tables.
--
Bruce Guenter, QCC Communications Corp. EMail: bruce(dot)guenter(at)qcc(dot)sk(dot)ca
Phone: (306)249-0220 WWW: http://www.qcc.sk.ca/~bguenter/