<http://schema.org/description>
"Google appears to be testing another new feature within its search results, rolling out a new 'Sources' information pane that provides information on a search query by sourcing information ..."^^<http://www.w3.org/2001/XMLSchema#string>
<http://thenextweb.com/google/2011/11/07/google-tests-sources-delivers-background-information-for-search-results/>