If you type in "Boyce Avenue" on Google, it shows a rich snippet of their upcoming events which I'm assuming is using Event Information. However, if you type in "boyceavenue.com/tour.html" in Google's rich snippet tool, nothing shows up. Why does this happen?
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Google and other search engines are using various data sources for generating Rich Snippets and similar functions. Rich meta-data crawled from the pages, be it RDFa, microdata, or microformats, is only ONE (yet important) source.
Google seems to have bilateral agreements with -- typically large -- sites for consuming their structured data directly. This why you may see rich snippets on pages that have no data markup in the HTML.
Google Fusion Tables (http://www.google.com/fusiontables/Home/) may also become a technique for exposing structured data to Google.
However, in general, using schema.org or http://purl.org/goodrelations/ (for ecommerce) markup in RDFa or microdata syntax is IMO the best option for new sites,
- because the data will be accessible to search engines and browser extensions alike and
- because the data will also send relevance signals to search engines (see http://wiki.goodrelations-vocabulary.org/GoodRelations_for_Semantic_SEO for more details.
Best wishes
Martin Hepp

Martin Hepp
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