<https://news.yahoo.co.jp/articles/26e0d449b59ef4749a0c3f666988bc0208f5a41a>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://news.yahoo.co.jp/articles/26e0d449b59ef4749a0c3f666988bc0208f5a41a>