arangosh> var examples = require("@arangodb/graph-examples/example-graph.js");
arangosh> var graph = examples.loadGraph("social");
arangosh> var any = require("@arangodb").db.relation.any();
arangosh> graph._fromVertex("relation/" + any._key);
{
"_key" : "bob",
"_id" : "male/bob",
"_rev" : "_WgE9tdG--_",
"name" : "Bob"
}