<https://adi555.pixnet.net/blog/post/104474389-%e6%88%91%e6%98%af%e7%a8%ae%e5%ad%90%e6%89%80%e4%bb%a5%e6%88%91%e4%b8%8d%e6%9c%83%e6%8a%b1%e6%80%a8>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://adi555.pixnet.net/blog/post/104474389>