gremlin> g.addV().property('name','alice').property('age',23).property('address','something')
==>v[11]
gremlin> g.V().has('name','alice').properties('address').property('source','bar')
==>vp[address->something]
gremlin> g.V().has('name','alice').properties('age').property('source','foo')
==>vp[age->23]
gremlin> g.V().properties().properties()
==>p[source->bar]
==>p[source->foo]
gremlin> g.io("graph_out.json").write().iterate()