PL/pgSQL

Hi there
I have a problem that I can not solve.
So is there any way to return a couple of rows from a PL/pgSQL function. I need
this because I have to execute a query with undefined depth of subqueryes (not
more than 10). The searched table represents a tree. And I have to find all sub
branches og a given branch.
here is the table:

CREATE SEQUENCE grp_id_seq;
CREATE TABLE grp (
    id INT PRIMARY KEY NOT NULL DEFAULT nextval('grp_id_seq'),
    name VARCHAR NOT NULL,
    info VARCHAR,
    type_id INT DEFAULT NULL REFERENCES grp_types(id),
    mastergrp_id INT REFERENCES grp(id)
);

I need it to use it in a query like this:

SELECT foo FROM footable WHERE groups IN sub_grp(some_grp_id);

Any idea how to make it?

Thanks in advance!

Hal

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