BITOR, BITXOR, BITNOT - where to place them?

Question

Currently, Oracle has only one bitwise operator - BITAND. All other bitwise operators, such as
BITOR, BITXOR, BITNAND, BITNOR, BITXNOR and BITNOT, must be derived from BITAND
and/or other (from it) consecutively derived operators.
I've created three functions for three bitwise operators : BITOR, BITXOR and BITNOT:
-- BITOR
CREATE FUNCTION "SYS"."BITOR" (x IN NUMBER, y IN NUMBER) RETURN NUMBER AS
BEGIN
  RETURN (x + y - BITAND(x, y));
END;
GRANT EXECUTE ON SYS.BITOR TO PUBLIC;
CREATE PUBLIC SYNONYM "BITOR" FOR "SYS"."BITOR";
-- BITXOR
CREATE FUNCTION "SYS"."BITXOR" (x IN NUMBER, y IN NUMBER) RETURN NUMBER AS
BEGIN
  RETURN (BITOR(x, y) - BITAND(x, y));
END;
GRANT EXECUTE ON SYS.BITXOR TO PUBLIC;
CREATE PUBLIC SYNONYM "BITXOR" FOR "SYS"."BITXOR";
-- BITNOT
CREATE FUNCTION "SYS"."BITNOT" (x IN NUMBER) RETURN NUMBER AS
BEGIN
  RETURN (-1 - x);
END;
GRANT EXECUTE ON SYS.BITNOT TO PUBLIC;
CREATE PUBLIC SYNONYM "BITNOT" FOR "SYS"."BITNOT";The functions are created in SYS schema and works well. My question is:
whenever a system-wide accessible function (a function available to all users just like
any other Oracle's built-in function) is to be created, what is appropriate place to
create it? Is it SYS, SYSTEM or SYSAUX schema?
Also, if anyone has a better coding solution for these functions (operators), please let
me know.
Thanks a lot.
Albert

Answer 1

oracle's long standing recommendation is that you do
not put anything in any of the supplied oracle
accounts (sys, system, sysaux). putting something
there could affect later patches or upgrades -
perhaps oracle will choose to create it's own object
which the same name as the one you made, and either
the upgrade fails, or you lose your objects.Yes, that's it. Understood. Thanks.
Albert