<https://kjmuk.com/%e3%81%be/%e3%83%9e%e3%83%aa%e3%82%aa%e3%82%b7%e3%83%aa%e3%83%bc%e3%82%ba/7876/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://kjmuk.com/%E3%81%BE/%E3%83%9E%E3%83%AA%E3%82%AA%E3%82%B7%E3%83%AA%E3%83%BC%E3%82%BA/7876/>