public static ITATSystem CreateNew(Guid systemID, string systemName, System.IO.Stream inputStream)
		{
			ITATSystem rtn = new ITATSystem();
			rtn._id = systemID;
			rtn._name = systemName;
			rtn.UpdateSystemDef(inputStream);
			return rtn;
		}
		public static ITATSystem CreateNew(Guid systemID, string systemName, string systemDef)
		{
			ITATSystem rtn = new ITATSystem();
			rtn._id = systemID;
			rtn._name = systemName;
			rtn.UpdateSystemDef(systemDef);
			return rtn;
		}