<https://www.enough-yanagawa.com/post/2019/12/02/12\u6708\u306E\u5B9A\u4F11\u65E5\u3001\u5E74\u672B\u5E74\u59CB\u306E\u55B6\u696D\u65E5\u7A0B>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.enough-yanagawa.com/post/2019/12/02/12%E6%9C%88%E3%81%AE%E5%AE%9A%E4%BC%91%E6%97%A5%E3%80%81%E5%B9%B4%E6%9C%AB%E5%B9%B4%E5%A7%8B%E3%81%AE%E5%96%B6%E6%A5%AD%E6%97%A5%E7%A8%8B>