<http://schema.org/query-input>
"required name=search_term_string"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.ticketmonster.com/buy-Ringling-Brothers-and-Barnum-and-Bailey-Circus-tickets-at-Amway-Center-Orlando-FL-01-12-2014/18180>