<https://www.conveniice.com/archives/tag/%e7%b2%89%e7%a0%95%e3%83%93%e3%82%b9%e3%82%b1%e3%83%83%e3%83%88>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.conveniice.com/archives/tag/%E7%B2%89%E7%A0%95%E3%83%93%E3%82%B9%E3%82%B1%E3%83%83%E3%83%88>