Oracle function returning set of rows

How can I write an oracle function that can return a set of rows? this is what I am doing now. It doesnt work.
create or replace FN_ABCD
(
reportdate in DATE
)
RETURN types.ref_cursor
as
l_cursor types.ref_cursor;

begin
open l_cursor for
 SELECT.....   return l_cursor;
end FN_ABCD; Received on Thu Aug 16 2007 - 09:04:56 CDT