<http://schema.org/query-input>
"required name=search_term_string"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.audible.com/pd/Teens/Vospers-Revenge-Audiobook/B00F3IZ4KA/ref%3Dsr_1_1?qid=1383754508&sr=1-1>