<https://blog.position-analyzer-ss.com/2021/10/01/10%e6%9c%882%e6%97%a5%e5%87%ba%e8%b5%b0%e3%81%ae%e6%b3%a8%e7%9b%ae%e9%a6%ac/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://blog.position-analyzer-ss.com/2021/10/01/10%E6%9C%882%E6%97%A5%E5%87%BA%E8%B5%B0%E3%81%AE%E6%B3%A8%E7%9B%AE%E9%A6%AC/>