- Originally set up to develop Regular Exressions for constrained GS1 Digital Link URIs as a basis for discussion in the EPCIS/CBV 2.0 Mission Specific Working Group.
- Beyond that, potential open source artefact to help in applying GS1 Digital Link URIs for populating EPCIS events, particularly for checking if given instance-level/class-level object, location and party IDs adhere to the 'constrained' syntax of GS1 Digital Link URIs.
- Checks whether a list of GS1 DL URIs conforms to the constrained syntax as defined in CBV 2.0
- Specifically:
- checks if GS1 DL URIs only comprise the primary identifier at the lowest, i.e. most precise level so that they correspond to the EPC URI/EPC Class URI schemes as defined in the EPC Tag Data Standard
- accepts any user domain/sub-domain (i.e. not just canonical GS1 DL URIs)
- checks that if a GS1 DL URI includes a GTIN, the latter is represented in its 14-digit format so that it is consistent with the definition of GS1 Application Identifier '01'
- Input: list of Digital Link URIs (e.g. as they are intended to populate the epcList/quantityList)
- Output: dictionary (JSON object) which contains, for all entries of the input list, key-value pairs with the contained GS1 DL URIs and corresponding Boolean values - either 'True' (if conformant) or 'False' (if not)
- Supported instance-level keys/compound keys:
- SSCC
- GTIN with serial (SGTIN)
- UPUI
- GDTI with serial
- SGCN with serial
- GINC
- GSIN
- GRAI with serial
- GIAI
- ITIP
- CPI with serial
- GSRN
- GSRNP
- Supported class-level keys/compound keys:
- GTIN
- GTIN + Lot (LGTIN)
- GDTI without serial
- SGCN without serial
- GRAI without serial
- CPI without serial
- Supported location/party keys/compound keys:
- GLN with extension
- GLN without extension
- Party GLN
- Cases covered through invalid examples (i.e. those returning 'False'):
- GTIN not formatted as GTIN-14 (i.e. corresponding to definition of GS1 Application Identifier (AI) '01')
- Applying short names instead of AI equivalents
- GTIN-based GS1 DL URI comprising consumer product variant (AI '22')
- GTIN-based GS1 DL URI comprising lot (AI 10) AND serial (AI 21) as key qualifiers (note: only one is allowed at a time)
- Containing characters that need to be percent-encoded
- Ending with a trailing slash
- AI equivalents in the query string
- Custom extensions in the query string
- Comprising non-existent AIs
- Data payload (e.g. serial number) exceeding character limit as defined per GS1 General Specifications
- Empty fields (e.g. batch number or serial number without content)
- Lacking a domain name
- Containing space characters
- Class-level (instead of instance-level) ID and vice versa
DRAFT (for discussion purposes)
- For the normative Regular Expressions, please refer to the CBV 2.0 standard, available at [https://www.gs1.org/standards/epcis].
- Regular Expressions are not identical in all programming languages. In this context, this Jupyter Notebook [https://jupyter.org] is based on Python [https://www.python.org/] and makes use of some simplifications enabled by Python's regular expressions ('re') module [https://docs.python.org/3/library/re.html], e.g. RegEx annotations and raw string notation for better readability and comprehensibility.
- GS1 Digital Link Standard: URI Syntax, Release 1.2, Ratified, Jan 2021 [https://www.gs1.org/standards/gs1-digital-link]
Copyright 2021/22 | Ralph Tröger ralph.troeger@gs1.de
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