<https://nakaya.shizu.website/2021/11/30/%e2%98%86%e6%98%8e%e6%97%a5%e3%81%8b%e3%82%8912%e6%9c%88%e2%98%86/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://nakaya.shizu.website/2021/11/30/%E2%98%86%E6%98%8E%E6%97%A5%E3%81%8B%E3%82%8912%E6%9C%88%E2%98%86/>