<http://schema.org/query-input>
"required name=search_term_string"^^<http://www.w3.org/2001/XMLSchema#string>
<https://www.tanga.com/users/new?return_path=%2Fdeals%2Ffront-page-for-2014-03-30%3Finternal_campaign%3Dheader_navigation_event_sales>