<https://nihonnnoosiro.com/2020/06/09/bs%e3%83%87%e3%82%a3%e3%82%af%e3%82%bd%e3%83%b3npb8%e5%b9%b4%e7%9b%ae-%e8%84%85%e5%a8%81%e3%81%ae%e6%88%90%e7%b8%be/#item>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://nihonnnoosiro.com/2020/06/09/bs%E3%83%87%E3%82%A3%E3%82%AF%E3%82%BD%E3%83%B3npb8%E5%B9%B4%E7%9B%AE-%E8%84%85%E5%A8%81%E3%81%AE%E6%88%90%E7%B8%BE/>