Showing schema.org aggregate rating in Google rich snippets

Posted by nickh on Pro Webmasters See other posts from Pro Webmasters or by nickh
Published on 2014-05-26T00:06:23Z Indexed on 2014/05/27 3:43 UTC
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After adding schema.org microdata markup for reviews and aggregate ratings, I expected review and rating information to show up in rich snippets. Unfortunately, neither are being shown.

Google's Structured Data Testing Tool finds the microdata, and there're no errors or warnings on the page. Any idea what's wrong with the microdata markup?

Example 1:

Example 2:

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