<http://schema.org/url>
<http://chanyi.tistory.com/entry/2012%EB%85%84-6%EC%9B%94-%EA%B3%A01-%EA%B3%A01-%EB%AA%A8%EC%9D%98%EA%B3%A0%EC%82%AC-%EB%B3%80%ED%98%95%EB%AC%B8%EC%A0%9C>
<http://chanyi.tistory.com/2218>