<http://schema.org/sku>
"4751"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.pennelcomonline.com/en/Neutrik-XLR-3-Pin-Female-Chassis-A-Series-LHand-Mount-Latchless-NC3FAHL1-0-NC3FAHL1-0/m-4751.aspx>