Rich Snippets are not something that is actively studied in the web development industry but I feel is essential for SEO reasons, which are very helpful if used correctly.
From what I have found “Rich Snippets” are a way in which search engines can identify/classify the type of content that can be found on your site and can help with search engine listings/optimisation.
http://schema.org/ is a site created in order to better classify web content from a combined effort by Google, Microsoft and Yahoo.
http://schema.org/docs/gs.html is a helpful place to start, below is my summery of the article.
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