<https://l9ck45ti.pixnet.net/blog/post/331713745-%e5%88%b7%e4%bf%9d%e8%b2%bb%e4%bf%a1%e7%94%a8%e5%8d%a1%e6%af%94%e8%bc%83-%e5%88%b7%e4%bf%9d%e8%b2%bb%e4%bf%a1%e7%94%a8%e5%8d%a12021-%e5%9c%a8%e6%97%85%e8%a1%8c%e3%80%81>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://l9ck45ti.pixnet.net/blog/post/331713745>