<http://schema.org/query-input>
"required name=search_term_string"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.audible.com/pd/Mysteries-Thrillers/Paul-Temple-and-the-Alex-Affair-Dramatized-Audiobook/B0038FBBM0?ref_=cat_10>