<https://www.amw.jp/2017/08/08/twitter-inc-%e3%80%90twtr%e3%80%91%e6%8a%95%e8%b3%87%e6%83%85%e5%a0%b1%ef%bc%9a-2017%e5%b9%b408%e6%9c%8808%e6%97%a5/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.amw.jp/2017/08/08/twitter-inc-%E3%80%90twtr%E3%80%91%E6%8A%95%E8%B3%87%E6%83%85%E5%A0%B1%EF%BC%9A-2017%E5%B9%B408%E6%9C%8808%E6%97%A5/>