arangosh> v1 = db.vertex.insert({ name : "vertex 1" });
{ 
  "_id" : "vertex/451630492", 
  "_rev" : "451630492", 
  "_key" : "451630492" 
}
arangosh> v2 = db.vertex.insert({ name : "vertex 2" });
{ 
  "_id" : "vertex/451827100", 
  "_rev" : "451827100", 
  "_key" : "451827100" 
}
arangosh> e1 = db.relation.insert(v1, v2, { label : "knows" });
{ 
  "_id" : "relation/452154780", 
  "_rev" : "452154780", 
  "_key" : "452154780" 
}
arangosh> db._document(e1);
{ 
  "label" : "knows", 
  "_id" : "relation/452154780", 
  "_rev" : "452154780", 
  "_key" : "452154780", 
  "_from" : "vertex/451630492", 
  "_to" : "vertex/451827100" 
}