<http://schema.org/query-input>
"required name=search_term_string"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.audible.com/pd/Arts-Entertainment/The-New-Yorker-Festival-Master-Class-in-the-Graphic-Novel-Audiobook/B002V8MNP4?ref_=sr_1_20&qid=1359418812&sr=1-20>