Web Schema is a set of extensible schemas that enables webmasters to embed structured data on their web pages for use by search engines and other applications.
Welcome to the 2011 edition of the Search Engine Ranking Factors. For the past 6 years, SEOmoz has compiled the aggregated opinions of dozens of the world's best and brightest search marketers into this biennial, ranking factors document. This year, for the first time, we're presenting a second form of data - correlation-based analysis - alongside the opinions of our 132-person panel.