<https://bigitoh.net/2020/02/07/%e3%82%aa%e3%83%aa%e3%82%ac%e5%be%a9%e6%b4%bb%ef%bc%81%ef%bc%81/#breadcrumblist>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://bigitoh.net/2020/02/07/%E3%82%AA%E3%83%AA%E3%82%AC%E5%BE%A9%E6%B4%BB%EF%BC%81%EF%BC%81/>