<https://book-forever.com/author/yusuke/#author>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://book-forever.com/sokumiru/web%E3%83%A9%E3%82%A4%E3%82%BF%E3%83%BC%E3%81%AE%E5%A7%8B%E3%82%81%E6%96%B9-4/>