<https://www.hokushinken.com/post/\u9AD8\u6821\u5165\u8A66\u6570\u5B66\u89E3\u8AAC-\u4E8C\u6B21\u65B9\u7A0B\u5F0F-3>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.hokushinken.com/post/%E9%AB%98%E6%A0%A1%E5%85%A5%E8%A9%A6%E6%95%B0%E5%AD%A6%E8%A7%A3%E8%AA%AC-%E4%BA%8C%E6%AC%A1%E6%96%B9%E7%A8%8B%E5%BC%8F-3>