<https://dic.pixiv.net/a/%E3%83%8A%E3%83%AB%E3%82%AD%E3%82%B9%28%E3%82%B2%E3%83%83%E3%82%BF%E3%83%BC%E3%83%AD%E3%83%9C%E8%99%9F%29>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://dic.pixiv.net/a/%E3%83%8A%E3%83%AB%E3%82%AD%E3%82%B9%28%E3%82%B2%E3%83%83%E3%82%BF%E3%83%BC%E3%83%AD%E3%83%9C%E8%99%9F%29>