Library for dealing with GS1 identifiers

GS1 is a ubiquitious system for globally unique identifiers in business, and is a superset of better-known standard identifiers such as UPC, EAN, ISBN, and ISSN.

GS1 also provides standards for how identifiers should be represented as barcodes and as RFID tags (the Electronic Product Code standard).

This library currently only includes functionality for a limited subset of the GS1 standard, mostly focused around EPCs. Additional functionality is welcome.

I'm also not especially familiar with Rust yet, so suggestions on how to structure this code better are greatly appreciated.

The GS1 standards are freely available and code in this library is cross-referenced to these wherever possible.