<http://schema.org/query-input>
"required name=search_term_string"^^<http://www.w3.org/2001/XMLSchema#string>
<https://www.bfw-bund.de/index.php?id=18&tx_ttproducts_pi1[backPID]=18&tx_ttproducts_pi1[product]=39&cHash=d93b3fd49f>