<https://www.balllawswim.org/post/\u5F85\u8B8A\u7684\u4E0D\u78BA\u5B9A>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.balllawswim.org/post/%E5%BE%85%E8%AE%8A%E7%9A%84%E4%B8%8D%E7%A2%BA%E5%AE%9A>