<https://sakurapurin.com/%e9%9b%a3%e7%97%85%e6%82%a3%e8%80%85%e7%a6%8f%e7%a5%89%e8%a6%8b%e8%88%9e%e9%87%91/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://sakurapurin.com/%E9%9B%A3%E7%97%85%E6%82%A3%E8%80%85%E7%A6%8F%E7%A5%89%E8%A6%8B%E8%88%9E%E9%87%91/>