<https://sunflower-c.com/%e3%82%b0%e3%83%ab%e3%83%bc%e3%83%97%e3%83%9b%e3%83%bc%e3%83%a0%e8%8a%8b%e6%8e%98%e3%82%8a-2016116/#listItem>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://sunflower-c.com/%E3%82%B0%E3%83%AB%E3%83%BC%E3%83%97%E3%83%9B%E3%83%BC%E3%83%A0%E8%8A%8B%E6%8E%98%E3%82%8A-2016116/>