<https://teambtrb.com/download/%e6%a3%ae%e3%81%ae%e3%81%8f%e3%81%be%e3%81%95%e3%82%93/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://teambtrb.com/download/%E6%A3%AE%E3%81%AE%E3%81%8F%E3%81%BE%E3%81%95%E3%82%93/>