<https://f-mirai.jp/archives/tag/%e9%bb%92%e6%be%a4%e7%be%8e%e9%9b%aa#breadcrumb>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://f-mirai.jp/archives/tag/%E9%BB%92%E6%BE%A4%E7%BE%8E%E9%9B%AA>