<http://schema.org/query-input>
"required name=search_term_string"^^<http://www.w3.org/2001/XMLSchema#string>
<https://www.utwente.nl/ces/vop/archief_nieuwsbrief/VoP%20afleveringen%20april%202003%20-%20mei%202005/Zevende%20aflevering%20-%20nov%202004/>