<https://www.corinmethod.com/2021/01/18/%e5%a4%a2%e3%82%92%e5%8f%b6%e3%81%88%e3%82%8b/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.corinmethod.com/2021/01/18/%E5%A4%A2%E3%82%92%E5%8F%B6%E3%81%88%E3%82%8B/>