<https://arisaft.com/2022/06/30/%e3%83%9a%e3%83%83%e3%83%88%e3%81%ae%e6%b0%97%e6%8c%81%e3%81%a1/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://arisaft.com/2022/06/30/%E3%83%9A%E3%83%83%E3%83%88%E3%81%AE%E6%B0%97%E6%8C%81%E3%81%A1/>