<https://oasis-doumon-f.com/#organization>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://oasis-doumon-f.com/lesson/%E7%84%A1%E6%96%99%E4%BD%93%E9%A8%93%E3%83%87%E3%83%BC%EF%BC%882019%E5%B9%B44%E6%9C%88pop/>