1 کامپیوتر و شبکه:: شناسانه رده-سطح
■ Class-level: An identifier is said to be a class-level identifier if multiple objects may carry the same identifier. In contrast, if both events contained class-level identifiers, then it is not certain that the same object participated in both events, because the second event could have been a different instance of the same class (i.e. , a different object carrying the same class-level identifier as the first object). Class-level identifiers are typically used only when it is impractical to assign unique instance-level identifiers to each object. Examples of class-level identifiers include GTIN, GTIN+lot, GRAI without serial, and GDTI without serial.
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