<http://schema.org/target>
"http://www.audible.com/search?advsearchKeywords={search_term_string}"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.audible.com/pd/History/A-More-Unbending-Battle-Audiobook/B0031KUENE?ref_=listener__c1_7>