title: How to iterate nested JSON with ArangoDB?
body: <p>I have JSON with next structure:
  <code>[[{"QID":1,"AID":1},{"SubAID":[]}],[{"QID":2,"AID":1},{"SubAID":[2,4]}],[{"QID":3,"AID":1},{"SubAID":[]}],{"MaxArea":"90","MinArea":"16"}]</code></p>
  
  <p>Is this ok for ArangoDB? I tried to push it's with http-api (I don't have a driver for my language - D), but I got <code>error 500</code>, maybe I'm wrong, maybe this JSON is not correct for ArangoDB.</p>
  
  <p>Also I would like to get any examples of iterating such JSON with AQL. For example if I need value of <code>SubAID</code> where <code>QID</code> is <code>2</code>, how should I write such query?</p>