<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/Classics/Essays-by-Ralph-Waldo-Emerson-Audiobook/B006VFL994?ref_=pd_sim_narr_1>