<https://www.lak-inc.jp/blog/4142/attachment/%e3%82%ad%e3%83%a3%e3%83%97%e3%83%81%e3%83%a3-134#breadcrumblist>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.lak-inc.jp/blog/4142/attachment/%E3%82%AD%E3%83%A3%E3%83%97%E3%83%81%E3%83%A3-134>