<https://miyahara-sr.com/case_post/%e9%96%a2%e7%af%80%e3%83%aa%e3%82%a6%e3%83%9e%e3%83%81%e3%81%ae%e4%ba%8b%e4%be%8b/attachment/jirei04/#itempage>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://miyahara-sr.com/case_post/%E9%96%A2%E7%AF%80%E3%83%AA%E3%82%A6%E3%83%9E%E3%83%81%E3%81%AE%E4%BA%8B%E4%BE%8B/attachment/jirei04/>