<https://shuhei7.com/2021/05/03/%e3%81%84%e3%81%84%e6%84%9f%e3%81%98/#breadcrumblist>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://shuhei7.com/2021/05/03/%E3%81%84%E3%81%84%E6%84%9F%E3%81%98/>