<https://kyo-ya.net/info/%e6%9c%ac%e5%bd%93%e3%81%ae%e4%bb%b2%e9%96%93%e3%81%a8%e5%8a%9b%e3%82%92%e5%90%88%e3%82%8f%e3%81%9b%e3%82%8b%e3%80%82/#listItem>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://kyo-ya.net/info/%E6%9C%AC%E5%BD%93%E3%81%AE%E4%BB%B2%E9%96%93%E3%81%A8%E5%8A%9B%E3%82%92%E5%90%88%E3%82%8F%E3%81%9B%E3%82%8B%E3%80%82/>