void unsubscribeObjectClassAttribute ( ObjectClassHandle theClass) // supplied C1 throw ( ObjectClassNotDefined, FederateNotExecutionMember, ConcurrentAccessAttempted, SaveInProgress, RestoreInProgress, RTIinternalError); void unsubscribeObjectClassAttribute ( // not implemented in 1.0 ObjectClassHandle theClass, // supplied Region theRegion) // supplied throw ( ObjectClassNotDefined, RegionNotKnown, FederateNotExecutionMember, ConcurrentAccessAttempted, RTIinternalError, UnimplementedService);