<https://1188note.com/1731/%e8%b5%a4%e3%81%a1%e3%82%83%e3%82%93%e7%94%9f%e5%be%8c4%e3%83%b6%e6%9c%88%e3%81%be%e3%81%a8%e3%82%81/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://1188note.com/1731/%E8%B5%A4%E3%81%A1%E3%82%83%E3%82%93%E7%94%9F%E5%BE%8C4%E3%83%B6%E6%9C%88%E3%81%BE%E3%81%A8%E3%82%81/>