System.err.println("# of trajectories..."+instances.size());
	private List findTrajectoryEntries(Vector mexes) {		SemanticTypesService sts = registry.getSemanticTypesService();		try {			List instances = 							sts.retrieveTrajectoryEntriesByMEXs(mexes);			System.err.println("# of trajectories..."+instances.size());			return instances;	   }	   catch(DSOutOfServiceException dso)        {            dso.printStackTrace();            UserNotifier un = registry.getUserNotifier();            un.notifyError("Connection Error",dso.getMessage(),dso);        }        catch(DSAccessException dsa)        {            dsa.printStackTrace();            UserNotifier un = registry.getUserNotifier();            un.notifyError("Server Error",dsa.getMessage(),dsa);        }        return null;	}