<http://schema.org/target>
"http://www.todostuslibros.com/busquedas/?keyword={search_term_string}"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.todostuslibros.com/libros/mot-de-passe-francais-1-1-bachillerato-niveau-a1-a2-cahier-d-activites_978-84-673-5167-5>