<https://tokidokiijyu.com/%e6%a1%9c%e3%80%80%e5%92%b2%e3%81%8f%ef%bc%81/#article>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://tokidokiijyu.com/%E6%A1%9C%E3%80%80%E5%92%B2%E3%81%8F%EF%BC%81/>