<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=840ad8357230b6ff3891d3a230aee34e&topic=165418.msg5566122>