<https://office1017.com/blog/871/%e3%81%9d%e3%81%b0%e5%b1%8b%ef%bc%94/#authorImage>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://office1017.com/blog/871/%E3%81%9D%E3%81%B0%E5%B1%8B%EF%BC%94/>