<https://kurasigoto.net/%e5%b0%91%e3%81%97%e3%81%9a%e3%81%a4%e5%89%8d%e3%81%ab/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://kurasigoto.net/%E5%B0%91%E3%81%97%E3%81%9A%E3%81%A4%E5%89%8D%E3%81%AB/>