<https://shimizu-tekkin.com/%e5%a4%a7%e9%98%aa%e5%b8%82%e5%9f%8e%e6%9d%b1%e5%8c%ba%e8%80%81%e4%ba%ba%e3%83%9b%e3%83%bc%e3%83%a0-4>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://shimizu-tekkin.com/%E5%A4%A7%E9%98%AA%E5%B8%82%E5%9F%8E%E6%9D%B1%E5%8C%BA%E8%80%81%E4%BA%BA%E3%83%9B%E3%83%BC%E3%83%A0-4>