<https://style.nikkei.com/article/DGXKZO65215120Q0A021C2H63A00?channel=ASH03019&k=201605270540>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://style.nikkei.com/article/DGXKZO65215120Q0A021C2H63A00?channel=DF290520184126&k=201605270540>