<http://schema.org/query-input>
"required name=search_term_string"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.gelderlander.nl/regio/arnhem-e-o/arnhem/kwart-miljoen-om-te-warme-scholen-in-arnhem-te-koelen-1.6089070>