<https://sakura-sakuranbo.com/%e3%83%9e%e3%83%8a%e3%83%bc%e3%81%a3%e3%81%a6%e3%80%81%e5%a4%a7%e4%ba%8b%ef%bc%81%ef%be%9f%d0%b4%ef%be%9f/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://sakura-sakuranbo.com/%E3%83%9E%E3%83%8A%E3%83%BC%E3%81%A3%E3%81%A6%E3%80%81%E5%A4%A7%E4%BA%8B%EF%BC%81%EF%BE%9F%D0%B4%EF%BE%9F/>