<http://schema.org/query-input>
"required name=search_term_string"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.osc.org/index.php?option=com_content&view=article&id=1009:pi-day&catid=16:events&Itemid=139&layout=default&date=2013-04-01>