<http://schema.org/query-input>
"required name=search_term"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.bulbs.com/Ballasts/$30_--_$50/1_X_40W_--_49W/4--Pin-Ballast_Lamp_Type/results.aspx?Ns=P_List+Price%7C0&pid=358>