<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%BC%CF%80%CF%84%CF%89%CE%BC%CE%B1%CF%84%CE%B1-%CE%BF%CF%83%CF%84%CF%81%CE%B1%CE%BA%CE%B9%CE%B1%CF%82/>