<http://schema.org/query-input>
"required name=search_term_string"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.4wd.com/Jeep-Engine-Performance/Plastic-Valve-Cover.aspx?t_c=74&t_s=552&t_pt=8136&t_pn=OAI17401.01>