<https://warabi.st/2021/03/17/%e7%b5%b5%e6%9c%ac%e3%81%ae%e6%99%82%e9%96%93202103/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://warabi.st/2021/03/17/%E7%B5%B5%E6%9C%AC%E3%81%AE%E6%99%82%E9%96%93202103/>