<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/43592-fs-leica-28mm-f-2-8-elmarit-version-1-1964-9-elements-black-paint-tab-rare.html>