<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/28207-wtb-chrome-voigtlander-35-1-2-zeiss-zm-50-1-5-a.html>