arangosh> a1 = db.example.insert({ a : 1 });
{ 
  "_id" : "example/1149694859", 
  "_rev" : "1149694859", 
  "_key" : "1149694859" 
}
arangosh> db.example.document(a1);
{ 
  "a" : 1, 
  "_id" : "example/1149694859", 
  "_rev" : "1149694859", 
  "_key" : "1149694859" 
}
arangosh> db.example.remove(a1);
true
arangosh> db.example.document(a1);
[ArangoError 1202: document not found]