<http://schema.org/topics>
"accessories,Apple,cases,features,Gadgets,gear,hipstamatic,iPhone,iPhone Resource Lists,iPhotography,joy,Lists,Mobile,mobile devices,Mobile Lists,Photo Lists,Photography,Tech,trending,Xshot"^^<http://www.w3.org/2001/XMLSchema#string>
<http://mashable.com/2011/08/07/iphone-photography-cases/>