Search engines fight duplication with canonical
Google, Microsoft and Yahoo are now providing a way for web site developers to specify a preferred URL for any piece of content on a web site. The problem has been that sites may, legitimately, have the same content on different URLs. This causes problems for search engines which can't easily differentiate between these duplications. Now, a new type of "canonical" link reference can allow a page to express the preferred URL for a search engine to use.
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