RDF
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RDFa 1.1 with a rich snippet example - W3C Blog
With RDFa 1.1 making its way out of last call, I looked at the examples from Google’s Webmaster Central to see what RDFa 1.1 brings to those. A typical example is the one on reviews ; here s where it starts out in RDF 1.0: L’Amourita Pizza Reviewed by Ulysses Grant on Jan 6 . Delicious, tasty pizza on Eastlake!
itemref attribute allows including properties elsewhere on the page that are not descendants of itemscope . Takes space-separated ids (for example itemref="address phone" would include the elements with id="address" and id="phone" ). Conceptually similar to the include-pattern . content attribute on the meta element can be used to include invisible data that is not part of the content. As current browsers move meta inside , make sure to include via itemref .
microdata · Microformats Wiki
Display local listing information directly in Yahoo! Search. Add code to indicate to Yahoo! that a local listing exists on your page, and when we next crawl your site, we'll take care of the rest. From your markup, we’ll be able to extract structured data from your site and render it automatically in an enhanced result in search results.
SearchMonkey - Local
RDFa Primer
Status of This Document This section describes the status of this document at the time of its publication. Other documents may supersede this document.
The Open Graph protocol enables any web page to become a rich object in a social graph. For instance, this is used on Facebook to allow any web page to have the same functionality as any other object on Facebook. While many different technologies and schemas exist and could be combined together, there isn't a single technology which provides enough information to richly represent any web page within the social graph.