<https://jagboy117.com/2019/07/25/%e3%81%82%e3%82%8b%e6%97%a5%e3%81%ae%e6%9c%9d/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://jagboy117.com/2019/07/25/%E3%81%82%E3%82%8B%E6%97%A5%E3%81%AE%E6%9C%9D/>