<http://schema.org/query-input>
"required name=search_term_string"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.audible.com/pd/Bios-Memoirs/The-Intimate-Lives-of-the-Founding-Fathers-Audiobook/B0040H3EAM?ref_=pr_rev_1_9>