<http://schema.org/query-input>
"required name=search_term_string"^^<http://www.w3.org/2001/XMLSchema#string>
<https://www.horseloverz.com/english-horse-tack/english-bits/eggbutt-snaffle-bit/centaur-stainless-steel-eggbutt-snaffle-w-75mm-flat-rings>