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