<https://shisei-reform.com/info/2%e6%9c%88%e3%81%ae%e5%b9%b3%e6%97%a5%e5%96%b6%e6%a5%ad%e6%99%82%e9%96%93%e3%81%af20%e6%99%82%e3%81%be%e3%81%a7%e3%81%a8%e3%81%aa%e3%82%8a%e3%81%be%e3%81%99%e3%80%82/#listItem>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://shisei-reform.com/info/2%E6%9C%88%E3%81%AE%E5%B9%B3%E6%97%A5%E5%96%B6%E6%A5%AD%E6%99%82%E9%96%93%E3%81%AF20%E6%99%82%E3%81%BE%E3%81%A7%E3%81%A8%E3%81%AA%E3%82%8A%E3%81%BE%E3%81%99%E3%80%82/>