<https://blog.nishino73.com/2016/01/26/%e7%b6%99%e7%b6%9a%e4%b8%ad/#breadcrumblist>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://blog.nishino73.com/2016/01/26/%E7%B6%99%E7%B6%9A%E4%B8%AD/>