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A little, tiny semantics in action — from Google

February 20th, 2009

I just read about Google’s Canonical Link Tag. It’s a little application of RDFa’s “rel” property. It is not a big thing, but I’m happy it is from Google, who seems quite remote from semantic web technologies.


“Last week Google, Yahoo, and Microsoft announced support for a new link element to clean up duplicate urls on sites. 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:

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 .”
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  1. February 21st, 2009 at 06:01 | #1

    While it is an interesting development, it has nothing to do with RDFa as such.

    HTML has had “rel” for many years, though it is often neglected. BTW one of the problems some in the HTML scene have articulated re RDFa, is that RDFa changes the rules for rel, using curies / qualified names instead of full URIs.

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  1. February 21st, 2009 at 10:49 | #1