<https://forum.appery.io/viewforum.php?f=3&amp;sid=30be8508ebd53d05c86ec417041aeed1#forum>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://forum.appery.io/viewforum.php?f=3&sid=30be8508ebd53d05c86ec417041aeed1>