<https://takashi-kato.com/img_29082019_185707_2160_x_2160_%e3%83%94%e3%82%af%e3%82%bb%e3%83%ab/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://takashi-kato.com/img_29082019_185707_2160_x_2160_%E3%83%94%E3%82%AF%E3%82%BB%E3%83%AB/>