<https://e43r21h.pixnet.net/blog/post/206243194-%e6%88%bf%e5%b1%8b%e4%bf%ae%e7%b9%95%e8%b2%b8%e6%ac%be-%e9%8a%80%e8%a1%8c---%e5%93%aa%e4%b8%80%e9%96%93%e9%8a%80%e8%a1%8c%e8%b2%b8%e6%ac%be%e6%9c%80%e5%bf%ab>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://e43r21h.pixnet.net/blog/post/206243194>