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Google does support RDFa.  However, on their own site (which is notoriously bad at giving us info) it says "Google suggests using microdata" - that's enough for me.  I have a few clients still on RDFa and from what I've seen, as long as you can get results through the Structured Data test link, you're usually good to go either way. http://www.google.com/webmasters/tools/richsnippets