Canonical Link Element – How to Avoid Duplicate Content
<link rel=”canonical” href=”http://example.com/page.html”/>
(Don’t firget the final / at the end of the link tag.)
Each of these URL’s are viewed as unique:
Source: Google Webmaster Central Blog
Canonical Link Element : Matt Cutts Presentation
The Canonical Link Element presentation was given on Thursday February 12, 2009
Notes: Google will give a sitemap preferential treatment when determining which URL to use when trying to determine Canonical isues.