<http://schema.org/query-input>
"required name=search_term_string"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.cambodiaun.org/?view=article&catid=18%3Amarch-11&id=30%3Aus-thanks-cambodia-for-supporting-the-us-search-for-american-soldiers-remains&format=pdf&option=com_content&Itemid=1>