<http://schema.org/availability>
"http://schema.org/InStock"^^<http://www.w3.org/2001/XMLSchema#string>
<https://www.mironet.cz/qnap-tvs882i516g-i56500-32ghz-16gb-ram-6x-35quot-sata-iii-2x-25quot-glan-usb-30+dp300713/>