<http://schema.org/query-input>
"required name=search_term_string"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.getdpi.com/forum/gear-fs-or-wtb/58198-fs-leica-tri-elmar-16-18-21-wate-w-viewfinder-paperwork-box-pouches.html>