<http://schema.org/query-input>
"required name=search_term_string"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.audible.com/pd/Newspapers-Magazines/The-Morning-Read-from-The-Wall-Street-Journal-November-21-2012-Audiobook/B0090T7RPI?ref_=cat_9>