<https://pino-tabi.com/tag/%e3%83%87%e3%82%a3%e3%82%ba%e3%83%8b%e3%83%bc%e3%83%af%e3%83%bc%e3%83%ab%e3%83%89/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://pino-tabi.com/tag/%E3%83%87%E3%82%A3%E3%82%BA%E3%83%8B%E3%83%BC%E3%83%AF%E3%83%BC%E3%83%AB%E3%83%89/>