title: Potential problems of mapping JSON to XML
body: <p>What are the major problems of mapping JSON to XML and viceversa? I have a set of problems that I can run into, but it would be very helpful if others can add what they have ran into when converting between both. </p>
  
  <p>My list is:</p>
  
  <ul>
  <li>Root object required in JSON  </li>
  <li>Unique keys (although only one of the two specifications requires this)  </li>
  <li>Keys cannot start with a number  </li>
  <li>Order may not be preserved (see <a href="http://www.xml.com/pub/a/2006/05/31/converting-between-xml-and-json.html" rel="nofollow">http://www.xml.com/pub/a/2006/05/31/converting-between-xml-and-json.html</a>)  </li>
  <li>Any other one?  </li>
  </ul>