<http://schema.org/availability>
"http://schema.org/InStock"^^<http://www.w3.org/2001/XMLSchema#string>
<https://www.mironet.cz/qnap-ts212p-marwell-16ghz-512-ddr3-ram-2x-sata-ii-usb-20-usb-30-glan+dp201684/>