Google’s own webmasters help site recommends microformats and RDFa structured data to improve indexing and usefulness of the data. Review metadata appears to have full support, while people, product, and business data are in beta.
Google Recommends Microformats and RDFa
One Comment to “Google Recommends Microformats and RDFa”
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Unfortunately, I haven’t seen any indication that they are going beyond their made-up vocabulary rooted at
http://rdf.data-vocabulary.org/. See this blog post for more info.