Call ref cursor functions in function also returning ref cursor?

Question

In 10g database, I have several functions and procedures, some packaged, that return ref cursors. These work as expected.
Is there a way to call one or more of these in a new function and return another ref cursor?
I know this doesn't work, but I hope it conveys the idea.
function f_get_order_lines
   return sys_refcursor -- or defined ref cursor
is
  v_ords orders_rcr;
  v_lines lines_rcr;
  x sys_refcursor;
begin
  v_ords := f_get_orders;
  for rec in v_ords
   loop
    v_lines := f_get_lines;
   ... do other work here...
  end loop;
return x;
end;

Answer 1

Pipelined table functions might do the trick for you, depending you your requirements and the transformations you need to make:
http://download.oracle.com/docs/cd/B19306_01/appdev.102/b14261/tuning.htm#sthref2345