<https://www.ana.rs/forum/index.php?topic=165418.0>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.ana.rs/forum/index.php?PHPSESSID=ace97201f62a410a6b049359c8c8f2f9&topic=165418.msg5566337>