gremlin> g = TinkerGraphFactory.createTinkerGraph()
==>tinkergraph[vertices:6 edges:6]
gremlin> g.v(1).outE("knows")
==>e[7][1-knows->2]
==>e[8][1-knows->4]
gremlin> g.v(1).outE("knows").inV().retain([g.v(4)])
==>v[4]
gremlin> g.v(1).as("x").outE("knows").as("y").inV().retain([g.v(4)]).select(["x","y"]) {it.map()} {it.weight}
==>[x:{name=marko, age=29}, y:1.0]