<https://soratabi.yamagata1.net/archives/tag/213%e5%8d%97%e9%99%bd%e5%b8%82#breadcrumblist>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://soratabi.yamagata1.net/archives/tag/213%E5%8D%97%E9%99%BD%E5%B8%82>