<https://hiroshijapanese.com/2019/07/%ef%bc%bb%e6%af%8f%e6%97%a5%e5%b0%88%e9%a1%8c%ef%bc%bd%e6%98%bc%e9%a1%94/#primaryimage>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://hiroshijapanese.com/2019/07/%EF%BC%BB%E6%AF%8F%E6%97%A5%E5%B0%88%E9%A1%8C%EF%BC%BD%E6%98%BC%E9%A1%94/>