<http://schema.org/headline>
"73% of iPhone 4S buyers are upgraders, 19% chose 64GB model"^^<http://www.w3.org/2001/XMLSchema#string>
<http://appleinsider.com/articles/11/10/14/survey_of_iphone_4s_buyers_finds_73_are_upgraders_19_chose_64gb_model>