<https://style.nikkei.com/article/DGXMZO58625790Z20C20A4000000?channel=ASH03009&k=201608100540>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://style.nikkei.com/article/DGXMZO58625790Z20C20A4000000?channel=DF260920172950&k=201608100540>