<https://sugiu.jp/2018/11/01/%e6%a0%84%e9%a4%8a%e5%a3%ab%e3%81%ae%e3%81%b2%e3%81%a8%e3%82%8a%e3%81%94%e3%81%a8/#breadcrumblist>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://sugiu.jp/2018/11/01/%E6%A0%84%E9%A4%8A%E5%A3%AB%E3%81%AE%E3%81%B2%E3%81%A8%E3%82%8A%E3%81%94%E3%81%A8/>