<https://google.com/article>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://community.f-secure.com/ja/kb/articles/2505-%E3%83%A2%E3%83%90%E3%82%A4%E3%83%AB-%E3%82%BB%E3%82%AD%E3%83%A5%E3%83%AA%E3%83%86%E3%82%A3%E3%81%AE%E3%83%A9%E3%82%A4%E3%82%BB%E3%83%B3%E3%82%B9%E3%81%AF%E3%81%A9%E3%81%86%E3%81%99%E3%82%8C%E3%81%B0%E8%B3%BC%E5%85%A5%E3%81%A7%E3%81%8D%E3%81%BE%E3%81%99%E3%81%8B>