arangosh> var examples = require("org/arangodb/graph-examples/example-graph.js");
arangosh> var graph = examples.loadGraph("social");
arangosh> graph.male.save({neym: "Jon", _key: "john"});
{ 
  "error" : false, 
  "_id" : "male/john", 
  "_rev" : "595944918", 
  "_key" : "john" 
}
arangosh> graph.male.replace("male/john", {name: "John"});
{ 
  "error" : false, 
  "_id" : "male/john", 
  "_rev" : "596141526", 
  "_key" : "john" 
}