Barcodes Nomenclatures define how barcodes are recognized and categorized. When a barcode is scanned it is associated to the first rule with a matching pattern. The pattern syntax is that of regular expression, and a barcode is matched if the regular expression matches a prefix of the barcode.

Patterns can also define how numerical values, such as weight or price, can be encoded into the barcode. They are indicated by {NNN} where the N's define where the number's digits are encoded. Floats are also supported with the decimals indicated with D's, such as {NNNDD}. In these cases, the barcode field on the associated records must show these digits as zeroes.