<https://c3p3g4x6w.pixnet.net/blog/post/175230312-kazana%e5%84%aa%e9%9b%85%e4%b8%bb%e7%be%a9%7e%e9%ab%98%e7%b4%9a%e7%89%9b%e9%ba%82%e7%9a%ae%e5%be%8c%e6%b5%81%e8%98%87%e7%9f%ad%e9%9d%b4-%e9%bb%91>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://c3p3g4x6w.pixnet.net/blog/post/175230312>