<https://www.ana.rs/forum/index.php?topic=224682.0>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.ana.rs/forum/index.php?PHPSESSID=002549410de2762e27d0a10b3e16a78d&topic=224682.msg15176550>