<http://schema.org/description>
"Google\u00A0announced today on Google+ that users of its social network can now utilize a new search filter. Now, search queries can be filtered so that they display photo only posts -- ..."^^<http://www.w3.org/2001/XMLSchema#string>
<http://thenextweb.com/google/2013/03/21/google-updated-with-new-search-filter-for-photo-only-posts/>