<https://www.conveniice.com/archives/tag/%e3%81%94%e3%82%8d%e3%81%94%e3%82%8d%e3%83%a9%e3%83%a0%e3%83%ac%e3%83%bc%e3%82%ba%e3%83%b3>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.conveniice.com/archives/tag/%E3%81%94%E3%82%8D%E3%81%94%E3%82%8D%E3%83%A9%E3%83%A0%E3%83%AC%E3%83%BC%E3%82%BA%E3%83%B3>