<https://houeimaru.net/2012/08/2012%e5%b9%b4%ef%bc%98%e6%9c%88%ef%bc%99%e6%97%a5/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://houeimaru.net/2012/08/2012%E5%B9%B4%EF%BC%98%E6%9C%88%EF%BC%99%E6%97%A5/>