arangosh> db._create("vertex");
[ArangoCollection 504427403, "vertex" (type document, status loaded)]
arangosh> db._createEdgeCollection("relation");
[ArangoCollection 504558475, "relation" (type edge, status loaded)]
arangosh> myGraph.v1 = db.vertex.insert({ name : "vertex 1" });
{ 
  "_id" : "vertex/504886155", 
  "_rev" : "504886155", 
  "_key" : "504886155" 
}
arangosh> myGraph.v2 = db.vertex.insert({ name : "vertex 2" });
{ 
  "_id" : "vertex/505082763", 
  "_rev" : "505082763", 
  "_key" : "505082763" 
}
arangosh> myGraph.e1 = db.relation.insert(myGraph.v1, myGraph.v2, { label : "knows" });
{ 
  "_id" : "relation/505410443", 
  "_rev" : "505410443", 
  "_key" : "505410443" 
}
arangosh> db._document(myGraph.e1);
{ 
  "label" : "knows", 
  "_id" : "relation/505410443", 
  "_rev" : "505410443", 
  "_key" : "505410443", 
  "_from" : "vertex/504886155", 
  "_to" : "vertex/505082763" 
}
arangosh> db.relation.inEdges(myGraph.v1._id);
[ ]
arangosh> db.relation.inEdges(myGraph.v2._id);
[ 
  { 
    "_id" : "relation/505410443", 
    "_key" : "505410443", 
    "_rev" : "505410443", 
    "_from" : "vertex/504886155", 
    "_to" : "vertex/505082763", 
    "label" : "knows" 
  } 
]