<https://eiya818.com/2019/10/08/post-703/%e3%83%a8%e3%83%bc%e3%83%ad%e3%83%83%e3%83%911%e4%ba%ba%e6%97%85-%e3%81%ae%e6%a5%bd%e3%81%97%e3%81%bf%e6%96%b9/#listItem>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://eiya818.com/2019/10/08/post-703/%E3%83%A8%E3%83%BC%E3%83%AD%E3%83%83%E3%83%911%E4%BA%BA%E6%97%85-%E3%81%AE%E6%A5%BD%E3%81%97%E3%81%BF%E6%96%B9/>