<https://kouei-renovation.jp/blog/%e5%8f%a4%e6%b0%91%e5%ae%b6%e6%94%b9%e7%af%89%e3%80%80%e7%8f%be%e5%a0%b4%e8%a6%96%e5%af%9f/#webpage>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://kouei-renovation.jp/blog/%E5%8F%A4%E6%B0%91%E5%AE%B6%E6%94%B9%E7%AF%89%E3%80%80%E7%8F%BE%E5%A0%B4%E8%A6%96%E5%AF%9F/>