<http://schema.org/query-input>
"required name=search_term_string"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.cambodiaun.org/?view=article&catid=22%3Ajuly-11&id=179%3Acambodian-premier-meets-academicians&format=pdf&option=com_content&Itemid=37>