<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/24367-sold-hasselblad-variogon-schneider-140-280mm-f-5-6-leather-case-650-a.html>