<https://www.karate-heiseikan.com/post/2017/05/04/\u5408\u540C\u5408\u5BBF>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.karate-heiseikan.com/post/2017/05/04/%E5%90%88%E5%90%8C%E5%90%88%E5%AE%BF>