<https://www.syachou-blog.com/taxation-business/tax/%e4%bc%9a%e7%a4%be%e3%81%8c%e7%b4%8d%e3%82%81%e3%82%8b%e7%a8%8e%e9%87%919%e7%a8%ae%ce%b1/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.syachou-blog.com/taxation-business/tax/%E4%BC%9A%E7%A4%BE%E3%81%8C%E7%B4%8D%E3%82%81%E3%82%8B%E7%A8%8E%E9%87%919%E7%A8%AE%CE%B1/>