void unsubscribeInteractionClass ( InteractionClassHandle theClass) // supplied C1 throw ( InteractionClassNotDefined, FederateNotExecutionMember, ConcurrentAccessAttempted, SaveInProgress, RestoreInProgress, RTIinternalError); void unsubscribeInteractionClass ( // not implemented in 1.0 InteractionClassHandle theClass, // supplied Region theRegion) // supplied throw ( InteractionClassNotDefined, RegionNotKnown, FederateNotExecutionMember, ConcurrentAccessAttempted, RTIinternalError, UnimplementedService);