<http://schema.org/query-input>
"required name=search_term_string"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.codingforums.com/ajax-and-design/295302-xhr-send-data-string-without-form.html?s=ad837a60d1c83e8f21dc549ec076c9d2>