<https://style.nikkei.com/article/DGXMZO63852970V10C20A9000000?channel=ASH06000&page=3>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://style.nikkei.com/article/DGXMZO63852970V10C20A9000000/?page=3>