<https://style.nikkei.com/article/DGXZQOLM047R90U2A800C2000000?channel=ASH00002&k=201608100540>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://style.nikkei.com/article/DGXZQOLM047R90U2A800C2000000?channel=ASH00002&k=201608100540>