<https://ilchibrainyoga-himeji.com/blog/%e8%82%a9%e7%94%b2%e9%aa%a8%e3%81%8c%e3%81%bb%e3%81%90%e3%82%8c%e3%82%8b%e8%82%a9%e5%9b%9e%e3%81%97/#listItem>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://ilchibrainyoga-himeji.com/blog/%E8%82%A9%E7%94%B2%E9%AA%A8%E3%81%8C%E3%81%BB%E3%81%90%E3%82%8C%E3%82%8B%E8%82%A9%E5%9B%9E%E3%81%97/>