<https://hirayamahideyoshi.com/news/4-25%e6%9c%88%e8%b1%88%ef%bc%88%e3%82%84%e3%81%be%e3%81%a8%ef%bc%89%e3%83%97%e3%83%ad%e3%82%b8%e3%82%a7%e3%82%af%e3%83%88%e6%a8%aa%e6%b5%9c%e5%85%ac%e6%bc%94/#listItem>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://hirayamahideyoshi.com/news/4-25%E6%9C%88%E8%B1%88%EF%BC%88%E3%82%84%E3%81%BE%E3%81%A8%EF%BC%89%E3%83%97%E3%83%AD%E3%82%B8%E3%82%A7%E3%82%AF%E3%83%88%E6%A8%AA%E6%B5%9C%E5%85%AC%E6%BC%94/>