@Override
        public Traversal<Vertex, String> get_g_V_unionXout__inX_name() {
            return g.V().union(out(), in()).values("name");
        }
@author Marko A. Rodriguez (http://markorodriguez.com)
gremlin-test/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/step/branch/UnionTest.java