<https://eian.jp/2020/10/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://eian.jp/2020/10/12/%EF%BC%91%EF%BC%90%E6%9C%88%EF%BC%91%EF%BC%92%E6%97%A5%EF%BC%88%E6%9C%88%EF%BC%89%E3%81%AE%E9%87%A3%E6%9E%9C/>