<https://eigatheater.com/2021/03/06/%e3%81%82%e3%81%ae%e5%a4%9c%e3%80%81%e3%83%9e%e3%82%a4%e3%82%a2%e3%83%9f%e3%81%a7/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://eigatheater.com/2021/03/06/%E3%81%82%E3%81%AE%E5%A4%9C%E3%80%81%E3%83%9E%E3%82%A4%E3%82%A2%E3%83%9F%E3%81%A7/>