<https://www.spica-sss.com/post/\u5FA9\u7FD2\u3067\u7406\u89E3\u3092\u6DF1\u3081\u3001\u52C9\u5F37\u7FD2\u6163\u3092\uFF01>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.spica-sss.com/post/%E5%BE%A9%E7%BF%92%E3%81%A7%E7%90%86%E8%A7%A3%E3%82%92%E6%B7%B1%E3%82%81%E3%80%81%E5%8B%89%E5%BC%B7%E7%BF%92%E6%85%A3%E3%82%92%EF%BC%81>