code: @Override
      protected void addHref(VertexWrapper vWrapper, Map<String, Object> filteredPropertyMap) {
          Map<String, Object> map = new HashMap<>(filteredPropertyMap);
          if (guid.equals("*")) {
              map.put(EntityTagResourceDefinition.ENTITY_GUID_PROPERTY, vWrapper.getVertex().getEdges(Direction.IN).
                      iterator().next().getVertex(Direction.OUT).getProperty(Constants.GUID_PROPERTY_KEY));
          } else {
              map.put(EntityTagResourceDefinition.ENTITY_GUID_PROPERTY, guid);
          }
  
          String href = resourceDefinition.resolveHref(map);
          if (href != null) {
              filteredPropertyMap.put("href", href);
          }
      }
docs: todo: duplication of effort with resource definition