<https://yufentai.pixnet.net/blog/post/330108842-day2-%e5%a4%a9%e9%be%8d%e5%af%ba>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://yufentai.pixnet.net/blog/post/330108842-day2-%E5%A4%A9%E9%BE%8D%E5%AF%BA>