<http://schema.org/description>
"Google is widely (and rightly) recognised as the mother of all search engines.\u00A0But, if you need to drill down your searches by more specific details, do you trust Google to give you ..."^^<http://www.w3.org/2001/XMLSchema#string>
<http://thenextweb.com/lifehacks/2012/04/29/30-specialist-and-super-smart-search-engines/ve/>