Live ORACLE

DECLARE
 emp      EMPLOYEE_TYP;
 emp_ref  REF EMPLOYEE_TYP;
BEGIN
 SELECT Ref(e)
 INTO   emp_ref
 FROM   employee_tab e
 WHERE  e.employee_id = 370;
 UPDATE employee_tab e
 SET    e.address = Address_typ('8701 College','Oakland','CA','94321')
 WHERE  Ref(e) = emp_ref;
END;
/  

Updating Rows in an Object Table With a REF Modifier