At the time of writing (June 2011), schema.org uses microdata (HTML5), which is basically a specification to convey semantics within an existing web page’s content. Search engines, like most machines, can only read and extract information on the page, but are not capable of understanding the real meaning of the content as intended by the content’s author. Using Schema.org and microdata makes it possible for search engines to understand your website content beyond simple HTML and text analysis. Schema.org markup has some highly specialized markups that will tell search engines that the content …