can you do a for loop on a function call in PL/PGSQL?

Basically what I'm trying to do is:

FOR zone_dns_r3 IN zone_dns_from_zone_dns_id(zone_dns_r.zone_dns_id,
zone_dns_r2.zone_dns_id)
LOOP
RETURN (zone_dns_r3) AND RESUME;
END LOOP;

Where I want to loop the results from a stored procedure (I happen to be
calling it recusively)
NOTICE: plpgsql: ERROR during compile of get_zone_dns_from_zone_dns_id near
line 29
ERROR: parse error at or near "get_zone_dns_from_zone_dns_id"

Is basically what its having problems with "the zone_dns_from_zone_dns_id("
call

Any ideas?

My full stored procedure:

CREATE FUNCTION get_zone_dns_from_zone_dns_id(INTEGER, INTEGER) RETURNS
setof zone_dns AS '
DECLARE
zone_dns_parent_id_param ALIAS FOR $1;
zone_dns_id_param ALIAS FOR $2;

zone_dns_r zone_dns%ROWTYPE;
zone_dns_r2 zone_dns%ROWTYPE;
zone_dns_r3 zone_dns%ROWTYPE;

BEGIN

FOR zone_dns_r IN
select
zone_dns.*
from
zone_dns
where
zone.zone_dns_id = zone_dns_id_param AND
zone_dns.zone_dns_parent_id = zone_dns_parent_id_param
LOOP
FOR zone_dns_r2 IN
select
zone_dns.*
from
zone_dns
where
zone_dns.zone_dns_parent_id = zone_dns_r.zone_dns_id
LOOP

FOR zone_dns_r3 IN zone_dns_from_zone_dns_id(zone_dns_r.zone_dns_id,
zone_dns_r2.zone_dns_id)
LOOP
RETURN (zone_dns_r3) AND RESUME;
END LOOP;
END LOOP;

RETURN (zone_dns_r) AND RESUME;
END LOOP;

RETURN;

END;
' LANGUAGE 'plpgsql';