<https://izumiotsu-rc.org/2019/12/20/%e3%82%af%e3%83%aa%e3%82%b9%e3%83%9e%e3%82%b9%e4%be%8b%e4%bc%9a-2/#breadcrumblist>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://izumiotsu-rc.org/2019/12/20/%E3%82%AF%E3%83%AA%E3%82%B9%E3%83%9E%E3%82%B9%E4%BE%8B%E4%BC%9A-2/>