<http://izonsho-blog.com/%ef%bd%81%e3%81%95%e3%82%93%e3%81%8b%e3%82%89%e3%81%ae%e6%89%8b%e7%b4%99-2>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<http://izonsho-blog.com/%EF%BD%81%E3%81%95%E3%82%93%E3%81%8B%E3%82%89%E3%81%AE%E6%89%8B%E7%B4%99-2>