<https://www.bubble-b.com/cd%e3%81%ae%e7%9b%a4%e9%9d%a2%e3%83%87%e3%82%b6%e3%82%a4%e3%83%b3%e9%9b%91%e5%ad%a6/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.bubble-b.com/cd%E3%81%AE%E7%9B%A4%E9%9D%A2%E3%83%87%E3%82%B6%E3%82%A4%E3%83%B3%E9%9B%91%E5%AD%A6/>