<http://www.constantglowth.com/blog/%e6%99%82%e4%bb%a3%e3%82%92%e5%85%88%e5%8f%96%e3%82%8a/attachment/%e3%83%96%e3%83%ad%e3%82%b0%e3%82%a2%e3%82%a4%e3%82%ad%e3%83%a3%e3%83%83%e3%83%81004/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<http://www.constantglowth.com/blog/%E6%99%82%E4%BB%A3%E3%82%92%E5%85%88%E5%8F%96%E3%82%8A/attachment/%E3%83%96%E3%83%AD%E3%82%B0%E3%82%A2%E3%82%A4%E3%82%AD%E3%83%A3%E3%83%83%E3%83%81004/>