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1. Uniform Resource Identifier (URI) http://en.wikipedia.org/wiki/Uniform_Resource_Identifier
2. Uniform Resource Locator (URL) http://en.wikipedia.org/wiki/Uniform_Resource_Locator
3. Uniform Resource Name (URN) http://en.wikipedia.org/wiki/Uniform_Resource_Name
4. Guidelines for URI Design origin : http://css-tricks.com/guidelines-for-uri-design/ chinese : http://www.oschina.net/news/11105/url-knowledge
5. URL redirection http://en.wikipedia.org/wiki/URL_redirection
6. Canonical URL Tag - The Most Important Advancement in SEO Practices Since Sitemaps http://www.seomoz.org/blog/canonical-url-tag-the-most-important-advancement-in-seo-practices-since-sitemaps