<http://schema.org/availability>
"http://schema.org/InStock"^^<http://www.w3.org/2001/XMLSchema#string>
<https://www.mironet.cz/epson-ebs04-svga-3lcd-projektor-800-x-600-3000-ansi-15-0001-hdmi-usb-3in1+dp252139/>