<http://www.mos-wing.com/blog/delicious/%e3%81%bf%e3%82%93%e3%81%aa%e5%a4%a7%e5%a5%bd%e3%81%8d%e3%82%ab%e3%83%ac%e3%83%bc%e3%80%80%e3%81%aa%e3%81%a9%e3%81%aa%e3%81%a9/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<http://www.mos-wing.com/blog/delicious/%E3%81%BF%E3%82%93%E3%81%AA%E5%A4%A7%E5%A5%BD%E3%81%8D%E3%82%AB%E3%83%AC%E3%83%BC%E3%80%80%E3%81%AA%E3%81%A9%E3%81%AA%E3%81%A9/>