<http://schema.org/query-input>
"required name=search_term_string"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.tradingunited.es/foro/trading-en-general/7524-que-te-diferencia-de-trader-profesional.html?s=1143d4b81c9aedeea5d01f1c2ca09304>