<https://platina-guild.org/2019/09/%e7%ac%ac85%e5%9b%9e%e5%ae%9a%e4%be%8b%e4%bc%9a%e3%82%92%e9%96%8b%e5%82%ac%e3%81%97%e3%81%be%e3%81%99/#primaryimage>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://platina-guild.org/2019/09/%E7%AC%AC85%E5%9B%9E%E5%AE%9A%E4%BE%8B%E4%BC%9A%E3%82%92%E9%96%8B%E5%82%AC%E3%81%97%E3%81%BE%E3%81%99/>