<http://schema.org/query-input>
"required name=search_term_string"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.peta.org/?ReturnUrl=%2Fb%2Fthepetafiles%2Farchive%2F2009%2F10%2F07%2FThis-Little-Piggy-Didnt-Go-to-Market-2.aspx%3FPageIndex%3D2>