SQL & PL/SQL :: How To Get Output Without SYSDBA Privilege

A function returns the metadata of named objects (Directories, Users, Tablespace....) in the form of DDL. When i execute the function in the schema having the privileges of CONNECT, RESOURCE, DBA, SELECT ANY TABLE, UNDER ANY VIEW AND EXECUTE ANY PROCEDURE, function returns the empty clob without any error. But he same function created and executed in the User having SYSDBA privilege, we get output.how to get output without SYSDBA privilege ?

CREATE OR REPLACE FUNCTION SCHEMA.DBLINK
RETURN CLOB
AS
v_meta_handle NUMBER;
v_meta_handle_trans NUMBER;
V_DOC CLOB;
V_LOB CLOB;
[code]....