<https://philosophycurry.com/tag/%e3%82%a2%e3%83%bc%e3%83%b3%e3%83%89%e3%83%a9>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://philosophycurry.com/tag/%E3%82%A2%E3%83%BC%E3%83%B3%E3%83%89%E3%83%A9>