<https://forum.ppr.pl/index.php?/topic/976-stare-maszyny-rolnicze/#comment-40661>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://forum.ppr.pl/index.php?/topic/976-stare-maszyny-rolnicze/&tab=comments#comment-40661>