<https://syogen.co.jp/blog/2017/11/04/%e7%97%a9%e3%81%9b%e3%81%9f%e8%85%95/#breadcrumblist>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://syogen.co.jp/blog/2017/11/04/%E7%97%A9%E3%81%9B%E3%81%9F%E8%85%95/>