<https://cderty2003.pixnet.net/blog/post/52201452-%e7%94%b7%e5%a5%b3%e6%84%9b%e6%83%85%e6%96%87%e6%b3%95%e5%a4%a7%e6%8f%ad%e7%a7%98>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://cderty2003.pixnet.net/blog/post/52201452>