<http://schema.org/query-input>
"required name=search_term_string"^^<http://www.w3.org/2001/XMLSchema#string>
<http://soso.gr/tag/%CF%83%CF%85%CE%BD%CF%84%CE%B1%CE%B3%CE%B7-%CE%B3%CE%B9%CE%B1-%CF%84%CE%B1%CF%81%CF%84%CE%B5%CF%82/>