<http://schema.org/query-input>
"required name=search_term_string"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.protothema.gr/politics/article/262563/o-kostas-isyxos_-apo-to-karakas_-gia-thn-khdeia-toy-oygko-tsabes/>