<https://tokaiyeg.com/2022/07/27/%e6%9c%89%e9%9b%bb%e5%8c%96%e3%81%ae%e3%82%a2%e3%83%99/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://tokaiyeg.com/2022/07/27/%E6%9C%89%E9%9B%BB%E5%8C%96%E3%81%AE%E3%82%A2%E3%83%99/>