`biip`
- `parse()` can parse GTIN and GS1-128 data.
`biip.gs1`
- `GS1Message` can parse GS1-128 data.
- `GS1ApplicationIdentifier` recognizes all 480 existing GS1 AIs.
- `GS1Prefix` recognizes all existing GS1 prefixes.
- `checksums` has functions to calculate check digits for numeric data and price/weight fields.
`biip.gtin`
- Support for validating, parsing, and converting between GTIN-8, GTIN-12, GTIN-13, and GTIN-14.