<https://style.nikkei.com/article/DGXMZO16444040W7A510C1000000?channel=ASH01009>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://style.nikkei.com/article/DGXMZO16444040W7A510C1000000?channel=ASH01009>