The [GTIN-12](http://apps.gs1.org/GDD/glossary/Pages/GTIN-12.aspx) code of the product, or the product to which the offer refers. The GTIN-12 is the 12-digit GS1 Identification Key composed of a U.P.C. Company Prefix, Item Reference, and Check Digit used to identify trade items. See [GS1 GTIN Summary](http://www.gs1.org/barcodes/technical/idkeys/gtin) for more details.
Ожидаемые значения должны быть одного из этих типов
Text
Используется в таких типах
Offer
Product
Demand

Schema Version 1.1