edgeExceptionSet = new ExceptionSet();
edgeExceptionSet = exceptionSetFactory.createExceptionSet();
		public ExceptionSet getEdgeExceptionSet(Edge edge) {			ExceptionSet edgeExceptionSet = edgeExceptionMap.get(edge);			if (edgeExceptionSet == null) {				edgeExceptionSet = new ExceptionSet();				edgeExceptionMap.put(edge, edgeExceptionSet);			}			return edgeExceptionSet;		}