<https://m-labbad.com/2021/06/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://m-labbad.com/2021/06/04/%E7%AD%94%E3%81%88%E5%90%88%E3%82%8F%E3%81%9B%E3%81%AF%E5%BF%85%E8%A6%81%E3%81%A7%E3%81%99%E2%9C%A8/>