<https://www.msgracy.com/2021/12/25/%e3%83%93%e3%82%b8%e3%83%a5%e3%83%bc%e4%bb%98%e3%81%8d%e3%82%b5%e3%83%86%e3%83%b3%e3%83%aa%e3%83%9c%e3%83%b3%e3%83%96%e3%83%ad%e3%83%bc%e3%83%81/#webpage>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.msgracy.com/2021/12/25/%E3%83%93%E3%82%B8%E3%83%A5%E3%83%BC%E4%BB%98%E3%81%8D%E3%82%B5%E3%83%86%E3%83%B3%E3%83%AA%E3%83%9C%E3%83%B3%E3%83%96%E3%83%AD%E3%83%BC%E3%83%81/>