<https://forum.wmasg.com/topic/149701-problem-ze-z%C5%82o%C5%BCeniem-repliki/#comment-1969368>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://forum.wmasg.com/topic/149701-problem-ze-z%C5%82o%C5%BCeniem-repliki/?tab=comments#comment-1969111>