Can we fetch a cursor data into ref cursor variable??

 Hi,

can any body please provide me a example or make sure that can we  fetch a cursor into ref cursor data type variable??

but here it is working

declare

cursor c is select  d.deptno,cursor( select * from emp  e where e.deptno=d.deptno) emp_all from dept d;

v_deptno number;

v_all sys_refcursor;

v_a emp%rowtype;

begin

open c;

loop

fetch c into v_deptno,v_all;

exit when c%notfound;

dbms_output.put_line(v_deptno);

loop

fetch v_all into v_a;

exit when v_all%notfound;

dbms_output.put_line(v_a.