<http://schema.org/query-input>
"required name=search_term_string"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.ticketmonster.com/buy-American-Ballet-Theatre-Don-Quixote-tickets-at-Metropolitan-Opera-House---Lincoln-Center-New-York-NY-05-14-2014/449466>