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Opengraph W3C valid?

Asked 2010-05-14T12:33:44.257
9

I would like to know if the opengraph markup is W3C valid, I'm getting the following error when I try to validate it:

Line 14, Column 17: there is no attribute "PROPERTY"
 <meta property="og:site_name" content="sitename">

In case it's not valid, will it impact my pagerank and other search engines algo?

Is it possible to cloak those properties?

html w3c facebook-opengraph
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With this seems to work:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML+RDFa 1.0//EN" "http://www.w3.org/MarkUp/DTD/xhtml-rdfa-1.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xmlns:v="http://rdf.data-vocabulary.org/#">
answered 2011-09-29T07:06:25.240

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