arangosh> var examples = require("org/arangodb/graph-examples/example-graph.js");
arangosh> var graph = examples.loadGraph("social");
arangosh> graph._toVertex("relation/aliceAndBob")
{ 
  "name" : "Bob", 
  "_id" : "male/bob", 
  "_rev" : "1521808267", 
  "_key" : "bob" 
}