<https://news.yahoo.co.jp/articles/23b7f89488addfb72ed0d8e0319b5dcec4255b90>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://news.yahoo.co.jp/articles/23b7f89488addfb72ed0d8e0319b5dcec4255b90>