<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/42097-zeiss-lens-blowout-18mm-f4-28mm-f2-8-50mm-f1-5-a.html>