<http://schema.org/query-input>
"required name=search_term_string"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.osc.org/index.php/components/com_jcalpro/themes/default/index.php?option=com_docman&task=doc_view&gid=98&tmpl=component&format=raw&Itemid=135>