<http://schema.org/keywords>
"iPhone, iphone7, WWDC16, novinky, iphone 6SE"^^<http://www.w3.org/2001/XMLSchema#string>
<https://www.thinkapple.sk/2016/09/05/objavili-sa-fotky-krabice-tohtorocneho-iphonu-aky-teda-ponesie-nazov/>