<https://theopenphotoproject.org/blog/seisakuzisseki/%E3%83%AA%E3%83%BC%E3%83%95%E3%83%AC%E3%83%83%E3%83%88%E3%81%AE%E3%83%87%E3%82%B6%E3%82%A4%E3%83%B3%E5%AE%9F%E7%B8%BE%E8%BF%BD%E5%8A%A0%E3%81%97%E3%81%BE%E3%81%97%E3%81%9F%E3%80%82#primaryimage>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://theopenphotoproject.org/blog/seisakuzisseki/%E3%83%AA%E3%83%BC%E3%83%95%E3%83%AC%E3%83%83%E3%83%88%E3%81%AE%E3%83%87%E3%82%B6%E3%82%A4%E3%83%B3%E5%AE%9F%E7%B8%BE%E8%BF%BD%E5%8A%A0%E3%81%97%E3%81%BE%E3%81%97%E3%81%9F%E3%80%82>