<https://www.hotroadkaitori.com/blog/staff/%e8%b1%8a%e6%a9%8b%e5%ba%97/15866>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.hotroadkaitori.com/blog/staff/%E8%B1%8A%E6%A9%8B%E5%BA%97/15866>