<http://schema.org/query-input>
"required name=search_term_string"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.peta.org/?ReturnUrl=%2Faction%2Fpages%2Faction_center%2FSample-letter-if-your-legislator-is-not-yet-a-co-sponsor.aspx>