<https://legare-daikanyama.com/blog/%e5%ae%ae%e5%b4%8e%e7%9c%8c%e3%82%aa%e3%82%aa%e3%83%8b%e3%83%99/#primaryimage>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://legare-daikanyama.com/blog/%E5%AE%AE%E5%B4%8E%E7%9C%8C%E3%82%AA%E3%82%AA%E3%83%8B%E3%83%99/>