<http://schema.org/availability>
"http://schema.org/InStock"^^<http://www.w3.org/2001/XMLSchema#string>
<https://www.mironet.cz/airlive-bu3028-venkovni-ip-kamera-h264-3mpix-25m-ir-smart-focus-motor-zoom-3105mm-8023afat-poe-bila+dp271645/>