<https://bhvz7nn39n.pixnet.net/blog/post/287542561-%e6%89%8b%e9%8c%b6%e3%80%90citizen%e3%80%91%e7%b6%93%e5%85%b8%e5%b7%a5%e8%97%9d%e8%87%aa%e5%8b%95%e4%b8%8a%e9%8d%8a%e8%85%95%e9%8c%b6-%e7%8e%ab%e7%91%b0%e9%87%91%28>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://bhvz7nn39n.pixnet.net/blog/post/287542561>