<http://schema.org/query-input>
"required name=search_term"^^<http://www.w3.org/2001/XMLSchema#string>
<https://www.zen-cart.com/showthread.php?207364-Normally-which-files-should-be-edited-to-add-a-element&s=352e36bdab4f2942f40105f243bff025&p=1197200>