<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%2F2011%2F08%2F18%2Fbill-clinton-s-vegan-evolution.aspx>