<http://schema.org/query-input>
"required name=search_term"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.greentrail-indochina.com/index.php?option=com_content&view=article&id=3365:thuy-anh-hotel&catid=153:ninh-binh-hotel&Itemid=79&book=booknow>