<https://monmonmonster.com/2019/07/28/1001%ef%bc%8f%e7%b5%90%e6%9e%9c%e8%ab%96%e3%82%92%e4%bd%bf%e3%81%84%e3%81%9f%e3%81%8c%e3%82%8b%e3%83%90%e3%82%ab/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://monmonmonster.com/2019/07/28/1001%EF%BC%8F%E7%B5%90%E6%9E%9C%E8%AB%96%E3%82%92%E4%BD%BF%E3%81%84%E3%81%9F%E3%81%8C%E3%82%8B%E3%83%90%E3%82%AB/>