The GTIN-13 code of the product, or the product to which the offer refers. This is equivalent to 13-digit ISBN codes and EAN UCC-13. Former 12-digit UPC codes can be converted into a GTIN-13 code by simply adding a preceeding zero. See <a href="http://www.gs1.org/barcodes/technical/idkeys/gtin">GS1 GTIN Summary</a> for more details.