<https://schooltakt.com/blog/17113/5c4d0a84b1a861b2da148f0405d84a4c-1/#itempage>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://schooltakt.com/blog/17113/5c4d0a84b1a861b2da148f0405d84a4c-1/>