<https://izumi-zenkou.com/2020/06/16/saba-ookisa-ga-sorou-sabakikata/#breadcrumblist>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://izumi-zenkou.com/2020/06/16/saba-ookisa-ga-sorou-sabakikata/>