Robert,

I think you are kidding. There is nothing difficult in your example. Did you
try to learn Ada :-) What are your dead line for this project :-)

Pascal.
-- 

--|------------------------------------------------------------
--| Pascal OBRY                               Team-Ada Member |
--|                                                           |
--| EDF-DER-IPN-SID- Ing�nierie des Syst�mes d'Informations   |
--|                                                           |
--| Bureau G1-010           e-mail: Pascal.Obry@der.edfgdf.fr |
--| 1 Av G�n�ral de Gaulle  voice : +33-1-47.65.50.91         |
--| 92141 Clamart CEDEX     fax   : +33-1-47.65.50.07         |
--| FRANCE                                                    |
--|------------------------------------------------------------
--|   "The best way to travel is by means of imagination"