myPrefetchingRelationshipKeyPaths = new PropertyListSet();
myPrefetchingRelationshipKeyPaths = new TreeSet();
  public void removePrefetchingRelationshipKeyPath(String _prefetchingRelationshipKeyPath, boolean _fireEvents) {    if (_fireEvents) {      Set oldPrefetchingRelationshipKeyPaths = myPrefetchingRelationshipKeyPaths;      if (oldPrefetchingRelationshipKeyPaths != null) {        myPrefetchingRelationshipKeyPaths = new PropertyListSet();        myPrefetchingRelationshipKeyPaths.addAll(oldPrefetchingRelationshipKeyPaths);        myPrefetchingRelationshipKeyPaths.remove(_prefetchingRelationshipKeyPath);      }      firePropertyChange(EOFetchSpecification.PREFETCHING_RELATIONSHIP_KEY_PATHS, oldPrefetchingRelationshipKeyPaths, myPrefetchingRelationshipKeyPaths);    }    else {      myPrefetchingRelationshipKeyPaths.remove(_prefetchingRelationshipKeyPath);    }  }