<https://arcre.jp/news/2021/%e7%ac%91%e9%a1%94%e3%81%ae%e5%8a%9b%e3%82%92/#breadcrumb>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://arcre.jp/news/2021/%E7%AC%91%E9%A1%94%E3%81%AE%E5%8A%9B%E3%82%92/>