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Excerpt: The three major search engines: Live, Yahoo and Google have agreed to adopt a new standard to highlight URLs that contain duplicate content. Duplicate content issues often occur when the same pages of content is accessed can be reached by multiple URLs or session IDs, particularly common in e-commerce sites, for example, where the same product might exist in different categories. There was always a concern that this could result in duplicate content penalties. The new attribute value is ‘canonical’ is used with the rel attribute in the links tag. It specifies the location of the page that this is a…