<https://monmonmonster.com/2020/12/01/%e3%80%90%e7%b5%b5%e6%9c%ac%e3%80%91%e3%83%91%e3%83%b3%e5%b1%8b%e3%81%95%e3%82%93%e3%81%ae%e3%81%84%e3%81%ac/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://monmonmonster.com/2020/12/01/%E3%80%90%E7%B5%B5%E6%9C%AC%E3%80%91%E3%83%91%E3%83%B3%E5%B1%8B%E3%81%95%E3%82%93%E3%81%AE%E3%81%84%E3%81%AC/>