<http://schema.org/query-input>
"required name=search_term_string"^^<http://www.w3.org/2001/XMLSchema#string>
<http://soso.gr/tag/%CE%BA%CE%B1%CE%BB%CE%BF%CE%BA%CE%B1%CE%B9%CF%81%CE%B9%CE%BD%CE%B7-%CE%B4%CE%B9%CE%B1%CE%BA%CE%BF%CF%83%CE%BC%CE%B7%CF%83%CE%B7/>