<https://forum.marino-grad.ru/topic/274-%D0%BD%D0%BE%D0%B2%D0%BE%D1%81%D1%82%D0%B8-211117/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://forum.marino-grad.ru/topic/274-%D0%BD%D0%BE%D0%B2%D0%BE%D1%81%D1%82%D0%B8-211117/>