<https://kagoami.com/store/blog/%e3%82%b5%e3%82%a4%e3%82%b6%e3%83%ab3/#breadcrumb>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://kagoami.com/store/blog/%E3%82%B5%E3%82%A4%E3%82%B6%E3%83%AB3/>