this copyright message.  This software is made available AS IS, and
 *  neither the GIPO team nor the University of Huddersfield make any warranty
 *  about the software or its performance.
 *
 *  Automatically generated OCL Domain from  GIPO Version 3.0
 *
 *  Author: John Beaven
 *  Institution: University of Huddersfield
 *  Date created: Wed Nov 22 12:43:37 GMT 2006
 *  Date last modified: 2006/12/06 at 02:46:46 PM GMT
 *  Description:
 *    Intruder detection system - models burglar, security guards, p