Sponging :  disallowed (Read-only view)

The serial number or any alphanumeric identifier of a particular product. Note that serial number are unique only for the same brand or the same model, so you cannot infer from two occurrences of the same serial number that the objects to which they are attached are identical. This property can also be attached to a gr:Offering in cases where the included products are not modeled in more detail.