<https://news.yahoo.co.jp/articles/f245c813bbc4b9a31d8820ad6fbbe8a2babca03f>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://news.yahoo.co.jp/articles/f245c813bbc4b9a31d8820ad6fbbe8a2babca03f>