<https://style.nikkei.com/article/DGXMZO55764390Y0A210C2000000?channel=ASH03002&k=201608270540>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://style.nikkei.com/article/DGXMZO55764390Y0A210C2000000?k=201608270540>