<https://style.nikkei.com/article/DGXMZO69135010W1A210C2000000?channel=ASH07004>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://style.nikkei.com/article/DGXMZO69135010W1A210C2000000?channel=ASH07004>