<https://lh2o8lze.pixnet.net/blog/post/327678131-2020%e4%bf%a1%e7%94%a8%e5%8d%a1%e6%af%94%e8%bc%83-%e7%8f%be%e9%87%91%e5%9b%9e%e9%a5%8b-%e5%93%aa%e4%b8%80%e5%bc%b5%e4%bf%a1%e7%94%a8%e5%8d%a1%e6%8f%9b%e5%85%8d%e8%b2%bb>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://lh2o8lze.pixnet.net/blog/post/327678131>