This attribute represents the barcode symbology, it can be one of the following: 3of9, 3of9ext, code39, code39ext,
usd3, usd3ext, usd-3, usd-3ext, codabar, code27, usd4, 2of7, monarch, nw7, usd-4, nw-7, ean13, ean-13, upca, upc-a,
isbn, bookland, code128, code128a, code128b, code128c, uccean128, 2of5, std2of5, int2of5, postnet or pdf417.