@Override
        public Traversal<Vertex, Vertex> get_g_V_hasXperson_name_markoX_path_asXaX_unionXidentity_identityX_selectXaX_unfold() {
            return g.V().has("person","name","marko").path().as("a").union(identity(),identity()).select("a").unfold();
        }
@author Marko A. Rodriguez (http://markorodriguez.com)
@author Stephen Mallette (http://stephen.genoprime.com)
@author Daniel Kuppitz (http://gremlin.guru)
gremlin-test/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/step/map/SelectTest.java