<https://www.talk.edu/ja/#website>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.talk.edu/ja/%E3%82%B3%E3%83%BC%E3%82%B9/%E3%83%91%E3%83%83%E3%82%B1%E3%83%BC%E3%82%B8/%E5%A4%A7%E5%AD%A6%E3%83%84%E3%82%A2%E3%83%BC%E3%83%91%E3%83%83%E3%82%B1%E3%83%BC%E3%82%B8/>