<https://sekainorekisi.com/glossary/%e7%99%bd%e6%b2%b3%e5%a4%a9%e7%9a%87/#breadcrumb>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://sekainorekisi.com/glossary/%E7%99%BD%E6%B2%B3%E5%A4%A9%E7%9A%87/>