<https://nyamo-lab.com/%e5%9b%bd%e9%9a%9b%e3%83%8b%e3%83%a5%e3%83%bc%e3%82%b9/234/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://nyamo-lab.com/%E5%9B%BD%E9%9A%9B%E3%83%8B%E3%83%A5%E3%83%BC%E3%82%B9/234/>