<https://blog.drs-secret.com/zh-hans/2019/05/08/%e4%bb%8e1%e6%95%b0%e5%88%b09%ef%bc%8c%e6%8a%a4%e8%82%a4%e5%af%86%e7%a0%81%e6%8f%a1%e5%9c%a8%e6%89%8b/#primaryimage>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://blog.drs-secret.com/zh-hans/2019/05/08/%E4%BB%8E1%E6%95%B0%E5%88%B09%EF%BC%8C%E6%8A%A4%E8%82%A4%E5%AF%86%E7%A0%81%E6%8F%A1%E5%9C%A8%E6%89%8B/>