<https://www.watersustainsus.net/2020/03/16/%e3%83%91%e3%82%a4%e3%82%b6%e3%82%ab%e3%82%b8%e3%83%8e-vip/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.watersustainsus.net/2020/03/16/%E3%83%91%E3%82%A4%E3%82%B6%E3%82%AB%E3%82%B8%E3%83%8E-vip/>