<https://hiroestyle.com/2021/04/27/%e3%80%90%e8%81%b4%e3%81%8f%e3%81%93%e3%81%a8%e3%81%a7%e5%bf%83%e3%81%8c%e3%82%86%e3%82%8b%e3%82%80%e3%83%86%e3%82%a3%e3%83%bc%e3%82%bf%e3%82%a4%e3%83%a0-%e3%80%91/#webpage>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://hiroestyle.com/2021/04/27/%E3%80%90%E8%81%B4%E3%81%8F%E3%81%93%E3%81%A8%E3%81%A7%E5%BF%83%E3%81%8C%E3%82%86%E3%82%8B%E3%82%80%E3%83%86%E3%82%A3%E3%83%BC%E3%82%BF%E3%82%A4%E3%83%A0-%E3%80%91/>