• 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 [email protected]

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