<https://www.hanya-arc.com/post/2016/07/15/\u795D\uFF01\uFF13\u51A0\u9054\u6210-\u96D1\u8A8C\u63B2\u8F09\uFF01>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.hanya-arc.com/post/2016/07/15/%E7%A5%9D%EF%BC%81%EF%BC%93%E5%86%A0%E9%81%94%E6%88%90-%E9%9B%91%E8%AA%8C%E6%8E%B2%E8%BC%89%EF%BC%81>