<http://schema.org/query-input>
"required name=search_term_string"^^<http://www.w3.org/2001/XMLSchema#string>
<http://seedworld.com/?view=article&catid=76%3Afebruary-2012&id=469%3Afebruary2012whoscounting&format=pdf&option=com_content&Itemid=278>