<https://www.i-do-yoga-tomo.com/post/2016/03/03/rakuraku\u30DE\u30DE\u30E8\u30AC-\u30B9\u30B1\u30B8\u30E5\u30FC\u30EB\u3067\u301C\u3059>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.i-do-yoga-tomo.com/post/2016/03/03/rakuraku%E3%83%9E%E3%83%9E%E3%83%A8%E3%82%AC-%E3%82%B9%E3%82%B1%E3%82%B8%E3%83%A5%E3%83%BC%E3%83%AB%E3%81%A7%E3%80%9C%E3%81%99>