<https://style.nikkei.com/article/DGXMZO67558880S0A221C2000000?channel=ASH05001&page=3>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://style.nikkei.com/article/DGXMZO67558880S0A221C2000000?page=3>