<http://schema.org/query-input>
"required name=search_term_string"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.codingforums.com/php/265660-warning-mail-smtp-server-response-need-rcpt-command-2.html?s=613b181b0a916e7e1a2fc36a92f48a22>