<https://sanejoker.info/category/%ce%b1%cf%84%ce%b1%ce%be%ce%b9%ce%bd%cf%8c%ce%bc%ce%b7%cf%84%ce%b1>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://sanejoker.info/2014/01/define-hypertext.html>