<https://forum.audio.com.pl/topic/49944-51-na-pc-problem-z-centralnym/#comment-211644>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://forum.audio.com.pl/topic/49944-51-na-pc-problem-z-centralnym/?tab=comments#comment-211655>