@Override
        public Traversal<Vertex, Integer> get_g_VX1X_valuesXageX_sumXlocalX(final Object vid1) {
            return g.V(vid1).values("age").sum(Scope.local);
        }
@author Daniel Kuppitz (http://gremlin.guru)
gremlin-test/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/step/map/SumTest.java