<https://ichiru.net/odekake/%e5%be%a1%e5%9c%92%e5%ba%a7%e3%81%b8%e6%ad%8c%e8%88%9e%e4%bc%8e%e3%82%92%e8%a6%8b%e3%81%ab%e8%a1%8c%e3%81%93%e3%81%86%e2%99%aa/#listItem>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://ichiru.net/odekake/%E5%BE%A1%E5%9C%92%E5%BA%A7%E3%81%B8%E6%AD%8C%E8%88%9E%E4%BC%8E%E3%82%92%E8%A6%8B%E3%81%AB%E8%A1%8C%E3%81%93%E3%81%86%E2%99%AA/>