<http://schema.org/query-input>
"required name=search_term_string"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.gelderlander.nl/extra/specials/vierdaagse-2016/wandelen/selfiestick-voor-vierdaagsewandelaars-neder-betuwe-1.6197558>