Manage acls in oracle

-- Create ACLS  
exec DBMS_NETWORK_ACL_ADMIN.CREATE_ACL('scott_utl_mail.xml','Allow mail to be send','SCOTT', TRUE, 'connect');  
-- Assign ACL to nework  
exec DBMS_NETWORK_ACL_ADMIN.ASSIGN_ACL('scott_utl_mail.xml','*',25);  
-- grant privilege to user:  
exec DBMS_NETWORK_ACL_ADMIN.ADD_PRIVILEGE('scott_utl_mail.xml','SCOTT', TRUE, 'connect');  
exec DBMS_NETWORK_ACL_ADMIN.ADD_PRIVILEGE('scott_utl_mail.xml' ,'SCOTT', TRUE, 'resolve');  
--Unassign network from ACL:  
exec DBMS_NETWORK_ACL_ADMIN.UNASSIGN_ACL('scott_utl_mail.xml','*',25);  
-- remove privilege from an user:  
exec DBMS_NETWORK_ACL_ADMIN.DELETE_PRIVILEGE('scott_utl_mail.xml','SCOTT', TRUE, 'connect');  
-- Drop ACL:  
exec DBMS_NETWORK_ACL_ADMIN.DROP_ACL ('scott_utl_mail.xml' );