<http://schema.org/query-input>
"required name=search_keyword"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.sdna.gr/politiko-deltio/diethni/article/56761/i-merkel-etoimazetai-gia-ypopsifia-kai-2017-gia-tin-kagkelaria>