<http://schema.org/query-input>
"required name=search_term_string"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.codingforums.com/post-a-php-snippet/205066-youtube-mp3-conversion-php-class-script-52.html?s=cdbe1b45998d4215038ef38af6c57e22>