<https://www.corinmethod.com/2019/09/30/%e4%bb%8a%e6%97%a5%e3%81%af%e3%82%b5%e3%83%b3%e3%83%90%e3%81%a7%e3%81%97%e3%81%9f/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.corinmethod.com/2019/09/30/%E4%BB%8A%E6%97%A5%E3%81%AF%E3%82%B5%E3%83%B3%E3%83%90%E3%81%A7%E3%81%97%E3%81%9F/>