In June 2011, three main search engines (Google, Bing and Yahoo) created a new standard for semantic search: schema.org .
Semantic search, what does it mean?
Let me show you a common situation.
The word "Avatar" can have more meanings: it could be a film title, an user image on a forum and a lot of other things. We can understund what we're talking about using the context, a machine can't, it needs more information.
For this reason schema.org dictionary was created: adding its elements we can define if a man is a director movie, the length of a video or how many comments...Read more http://feeds.joomla.org/~r/JoomlaExtensions/~3/KQ0wd04EzOQ/19961