<https://steam-kouryaku.com/post-1175/%e3%82%b9%e3%82%af%e3%83%aa%e3%83%bc%e3%83%b3%e3%82%b7%e3%83%a7%e3%83%83%e3%83%88-203>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://steam-kouryaku.com/post-1175/%E3%82%B9%E3%82%AF%E3%83%AA%E3%83%BC%E3%83%B3%E3%82%B7%E3%83%A7%E3%83%83%E3%83%88-203>