<https://a24378800.pixnet.net/blog/post/39073085-%e5%8d%a1%e5%b0%bc%e7%88%be%e5%b0%88%e6%a5%ad%e6%b7%a1%e6%96%91%e7%b2%be%e8%8f%af>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://a24378800.pixnet.net/blog/post/39073085-%E5%8D%A1%E5%B0%BC%E7%88%BE%E5%B0%88%E6%A5%AD%E6%B7%A1%E6%96%91%E7%B2%BE%E8%8F%AF>