gtin property
//en.wikipedia.org/wiki/Global_Trade_Item_Number) for more details Left-padding of the gtin values is not required or encouraged The [gtin] property generalizes the earlier [gtin8], [gtin12], [gtin13], and [gtin14] properties Note also that this is a definition for how to include GTINs in Schema.org data, and not a definition of GTINs in general - see the GS1 documentation for authoritative details. Supported types: String, String
Implementation
String? gtin;