Cayley tagging

gistfile1.txt

//src
var filmToActor = g.Morphism().Out("/film/film/starring").Out("/film/performance/actor")  

g.V().Has("name", "Casablanca").Save("name", "source").Follow(filmToActor).Tag("target").All()

//Output (note the different "source" values in first and remaining records):

{
 "result": [
  {
   "id": ":/en/humphrey_bogart",
   "source": "Casablanca",
   "target": ":/en/humphrey_bogart"
  },
  {
   "id": ":/en/ingrid_bergman",
   "source": "/film/film",
   "target": ":/en/ingrid_bergman"
  },
  {
   "id": ":/en/paul_henreid",
   "source": "/film/film",
   "target": ":/en/paul_henreid"
  },
  {
   "id": ":/en/claude_rains",
   "source": "/film/film",
   "target": ":/en/claude_rains"
  },
  {
   "id": ":/en/conrad_veidt",
   "source": "/film/film",
   "target": ":/en/conrad_veidt"
  },
  {
   "id": ":/en/sydney_greenstreet",
   "source": "/film/film",
   "target": ":/en/sydney_greenstreet"
  },
  {
   "id": ":/en/peter_lorre",
   "source": "/film/film",
   "target": ":/en/peter_lorre"
  },
  {
   "id": ":/en/s_z_sakall",
   "source": "/film/film",
   "target": ":/en/s_z_sakall"
  },
  {
   "id": ":/en/madeleine_lebeau",
   "source": "/film/film",
   "target": ":/en/madeleine_lebeau"
  },
  {
   "id": ":/en/dooley_wilson",
   "source": "/film/film",
   "target": ":/en/dooley_wilson"
  },
  {
   "id": ":/en/joy_page",
   "source": "/film/film",
   "target": ":/en/joy_page"
  },
  {
   "id": ":/en/john_qualen",
   "source": "/film/film",
   "target": ":/en/john_qualen"
  },
  {
   "id": ":/en/leonid_kinskey",
   "source": "/film/film",
   "target": ":/en/leonid_kinskey"
  },
  {
   "id": ":/en/helmut_dantine",
   "source": "/film/film",
   "target": ":/en/helmut_dantine"
  },
  {
   "id": ":/en/lou_marcelle",
   "source": "/film/film",
   "target": ":/en/lou_marcelle"
  }
 ]
}