<https://style.nikkei.com/article/DGXNASFK31007_R31C12A0000000?channel=ASH04002&page=3>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://style.nikkei.com/article/DGXNASFK31007_R31C12A0000000?page=3>