<http://schema.org/query-input>
"required name=search_term_string"^^<http://www.w3.org/2001/XMLSchema#string>
<https://www.waitrose.com/shop/LogonForm?wtrint=1-Content-_-2-Inspiration-_-3-Christmas2013-_-4-puddings-_-5-banner-_-6-bookslot>