<http://schema.org/keywords>
"facebook, messenger, appstore, aplik\u00E1cie, iOS aplik\u00E1cie, apps, top10"^^<http://www.w3.org/2001/XMLSchema#string>
<https://www.thinkapple.sk/2015/12/21/top-10-najpouzivanejsich-aplikacii-pre-smatfony/>