anchor.diff:     */
     void recordRelationship(Element element, Relationship relationship,
         Location location) {
  -    RelationKeyData key =
  -        new RelationKeyData.forObject(
  -            _elementCodec,
  -            _relationshipCodec,
  -            element,
  -            relationship);
  +    RelationKeyData key = new RelationKeyData.forObject(
  +        _elementCodec,
  +        _relationshipCodec,
  +        element,
  +        relationship);
       // prepare LocationData(s)
       List<LocationData> locationDatas = _relations[key];
       if (locationDatas == null) {
  
positive.code:   void clear() {
      _contextNodeRelations.clear();
      _nodeManager.clear();
      _nameToNodeNames.clear();
    }
  
    @override
  
negative.code:    * A table mapping element names to the node names that may have relations with elements with
     * these names.
     */
    Map<Relationship, IntToIntSetMap> _relToNameMap =
        new HashMap<Relationship, IntToIntSetMap>();
  
    /**
     * The [NodeManager] to get/put [IndexNode]s.
  