Ok, I did it (well, sort of). Here is a beta (or better: proof of concept) for the new tag which tells the search engines Google, Yahoo! and Live which URL it should have for the current page. Matt Cutts (software engineer at Google) explains the new canonical tag:
The syntax is pretty simple: An ugly url such as http://www.example.com/page.html?sid=asdf314159265 can specify in the HEAD part of the document the following:
<link rel="canonical" href="http://example.com/page.html"/>
That tells search engines that the preferred location of this url (the “canonical” location, in search engine speak) is http://example.com/page.html instead of http://www.example.com/page.html?sid=asdf314159265 .
What can it do for my webshop?
If search engines find the same content on irregular/different URL, the page/content will be marked as “duplicate content”. This is a common mistake which you want to avoid since you want to have all your pages indexed properly. However, there are some factors that can lead to several URL’s for one page.
Canonical tag for your osCommerce webshop…