<http://schema.org/query-input>
"required name=search_term_string"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.justlead.co.uk/?option=com_virtuemart&page=shop.browse&only_page=1&category_id=32&pop=1&tmpl=component&vmcchk=1&Itemid=111>