<http://schema.org/query-input>
"required name=search_term_string"^^<http://www.w3.org/2001/XMLSchema#string>
<http://forum.videohelp.com/threads/322372-What-format-do-I-use-for-a-DVD?s=b8d6acb37f3ac65ecc841908a8fd6f0a&p=1996111>