<http://schema.org/description>
"Google on Wednesday tweaked its SafeSearch setting and images search algorithm, significantly altering its search results: previously explicit searches have stopped returning explicit ..."^^<http://www.w3.org/2001/XMLSchema#string>
<http://thenextweb.com/insider/2012/12/14/after-google-tweaks-image-search-algorithm-the-porn-only-search-xxx-sees-50-increase-in-traffic/>