using pl/pgsql

Hello all I would like to create a pl/pgsql function that can handle a
query that will work on different schemas.  But I am not sure about the
RECORD type and if I can return more then one row.   could PL/pgsql
return more then 1 row from the database.    Would i have to use the
FOR-IN-SELECT for this?
thanks if you can help
-- 
Antoine