<https://a8266769.pixnet.net/blog/post/28832393-%e6%9f%94%e6%83%85%e8%a7%92%e8%90%bd>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://a8266769.pixnet.net/blog/post/28832393-%E6%9F%94%E6%83%85%E8%A7%92%E8%90%BD>