<https://replus-design.com/2021/#listItem>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://replus-design.com/2021/07/25/%E3%81%8A%E3%81%A8%E3%81%AA%E3%81%AE%E3%83%90%E3%83%B3%E3%83%89%E5%80%B6%E6%A5%BD%E9%83%A8/>