<https://style.nikkei.com/article/DGXZQOUC252XA0V20C22A1000000?channel=ASH04006&k=202108060300>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://style.nikkei.com/article/DGXZQOUC252XA0V20C22A1000000?channel=ASH04006&k=202108060300>