<https://challenge-juku.com/juniorhighschool/%e4%b8%ad2%e7%94%9f%e3%82%b3%e3%83%bc%e3%82%b9_%e6%ae%8b%e5%b8%ad%e3%81%82%e3%82%8a-3/#breadcrumblist>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://challenge-juku.com/juniorhighschool/%E4%B8%AD2%E7%94%9F%E3%82%B3%E3%83%BC%E3%82%B9_%E6%AE%8B%E5%B8%AD%E3%81%82%E3%82%8A-3/>