<https://www.goodspress.jp/tag/%e3%82%b9%e3%83%9e%e3%83%9b%e3%83%aa%e3%83%b3%e3%82%b0/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.goodspress.jp/tag/%E3%82%B9%E3%83%9E%E3%83%9B%E3%83%AA%E3%83%B3%E3%82%B0/>