<https://soudan-aite.net/%e6%99%82%e9%96%93%e3%81%af%e8%b3%87%e6%ba%90/#article>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://soudan-aite.net/%E6%99%82%E9%96%93%E3%81%AF%E8%B3%87%E6%BA%90/>