<https://eastvalleys.com/2019/06/01/%e3%82%b7%e3%83%bc%e3%83%95%e3%83%bc%e3%83%89%e3%82%82%e3%82%93%e3%81%98%e3%82%83%e3%80%80980%e5%86%86/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://eastvalleys.com/2019/06/01/%E3%82%B7%E3%83%BC%E3%83%95%E3%83%BC%E3%83%89%E3%82%82%E3%82%93%E3%81%98%E3%82%83%E3%80%80980%E5%86%86/>