<http://schema.org/availability>
"http://schema.org/InStock"^^<http://www.w3.org/2001/XMLSchema#string>
<https://www.mironet.cz/mikrotik-rb951ui2hnd-routerboard-128-mb-ram-600-mhz-5x-lan-1x-usb-vc-l4+dp199829/>