<http://schema.org/description>
"If you use Google as your primary search tool, you know that any tip or tool to make the experience more useful is a bonus.\r\n\r\nInstead of bookmarking every page you visit via a Google ..."^^<http://www.w3.org/2001/XMLSchema#string>
<http://thenextweb.com/lifehacks/2012/06/22/nifty-google-search-lets-you-filter-out-search-results-youve-already-visited/>