<https://trust-kaisha.com/2017/10/24/%e4%bc%9a%e7%a4%be%e8%aa%ac%e6%98%8e%e4%bc%9a-2/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://trust-kaisha.com/2017/10/24/%E4%BC%9A%E7%A4%BE%E8%AA%AC%E6%98%8E%E4%BC%9A-2/>