<http://schema.org/query-input>
"required name=search_term"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.zen-cart.com/showthread.php?137896-Just-want-to-use-Zencart-to-display-my-products-How-do-I-turn-of-all-buy-options&p=786194>