<http://schema.org/query-input>
"required name=search_term_string"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.audible.com/pd/Classics/Don-Quijote-de-la-Mancha-Audiobook/B00CYKEHNA?ref_=cat_22266_c10_1_i>