@Override
 public int hashCode() {
   final int prime = 31;
   int result = 1;
   result = prime * result + ((fE == null) ? 0 : fE.hashCode());
   result = prime * result + ((fAttr == null) ? 0 : fAttr.hashCode());
   result = prime * result + ((fType == null) ? 0 : fType.hashCode());
   return result;
 }
 public int hashCode() {
   int result;
   result = eClass.hashCode();
   result = 29 * result + idFactory.hashCode();
   return result;
 }