<https://accrcw75.pixnet.net/blog/post/2409922-%e7%8f%be%e4%bb%a3%e6%b0%91%e4%b8%bb%e5%9c%8b%e5%ae%b6%e6%a9%9f%e5%99%a8%e9%81%8b%e4%bd%9c%e8%88%87%e5%8f%b0%e7%81%a3%e6%b0%91%e4%b8%bb%e4%ba%82%e8%b1%a1-%e2%94%80%e4%b8%8a-%28>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://accrcw75.pixnet.net/blog/post/2409922>