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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.akvalang.com/forum/topic/7373-%D0%BE%D1%82%D0%BC%D0%B0%D0%B7%D0%BA%D0%B8-%D0%B8%D0%B3%D1%80%D0%B0/page/4/>