<https://sake-j.jp/blogs/%E3%83%90%E3%83%83%E3%82%AF%E3%83%8A%E3%83%B3%E3%83%90%E3%83%BC/hokkaido-interview>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://sake-j.jp/blogs/%E3%83%90%E3%83%83%E3%82%AF%E3%83%8A%E3%83%B3%E3%83%90%E3%83%BC/hokkaido-interview>