<https://shoyo-kosodate.com/2021/11/22/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://shoyo-kosodate.com/2021/11/22/%E3%81%9F%E3%81%BE%E3%81%94%E3%81%A1%E3%82%83%E3%82%93%E3%81%AE%E6%97%A5-11/>