<http://schema.org/query-input>
"required name=search_term_string"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.4wd.com/Drivetrain-Differential/Automatic-Transmission-Shifter-Knob.aspx?t_c=12&t_s=513&t_pt=8131&t_pn=RUG11421.01>