<https://svejo.net/stories/2200419-kak-da-razberem-che-sme-bremenni-bez-test#breadcrumb>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://svejo.net/stories/2200419-kak-da-razberem-che-sme-bremenni-bez-test>