<http://schema.org/query-input>
"required name=search_term_string"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.ijsselmotoren.nl/?page=shop.product_details&category_id=4&flypage=flypage.tpl&product_id=1347&option=com_virtuemart&Itemid=15>