[Openid-specs-digital-credentials-protocols] Minutes from APAC DCP Working Group Call

[Paul Bastian]

Notes from DCP Call 7th of May 2024

Participants:

- Paul Bastian
- Kristina Yasuda
- Joseph Heenan
- Daniel Fett
- Brian Campbell
- Michael Jones
- Oliver Terbu
- Christian Bormann
- Tobias Looker
- Sebastian Bahoul

- Agenda:
   - OpenID4VCI Terminology
   - OpenID4VCI Batch Credential Issuance
   - Client_metadata
   - PE Query Syntax evolution discussions
- upcoming events
   - Identiverse, EIC, DICE
   - Kristina offers to organize a hybrid DCP session at Identiverse
- PR#155 https://github.com/openid/OpenID4VCI/pull/155 
<https://github.com/openid/OpenID4VCI/pull/155>
   - Paul worked through all the comments
   - few approvals, no big contradictions
   - one open point left: Credential -> also call Credential instance?
   - most prefer only "Credential"
   - Paul: instances helps with explaining the batch issuance
   - agreement: use instance of Credential in description where it makes 
sense, leave the term as "Credential"
   - minor change to prepend SD-JWT VC with IETF and mDL with ISO
   - all things solved, anough approvals
   - Kristina will merge
- PR#293 https://github.com/openid/OpenID4VCI/pull/293 
<https://github.com/openid/OpenID4VCI/pull/293>
   - batch issuance based on the new terminology
   - present the current proposal
   - much appreciation for the direction of the PR
   - restarting discussion to delete batch endpoint after this PR
   - discussion on optimizing the proofs to avoid duplicaiton in array 
of proof objects
   - direction to use cnf-like mechanism
- OpenID4VP Issue#17 What goes into client_metadata?
   - its based on DCR, some values do not make sense
   - probably needs a deep dive
   - Tobias/Oliver: depends if these are signed or not, unsigned 
metadata may be dangerous
   - Oliver: clarifications are needed when parameters could be fetched 
over multiple mechanisms, mix and match?
- Query Language Developments
   - Daniel presents work from Daniel/Kristina/Paul: 
https://hackmd.io/1siVhjzOTWOE9ppdF_t57A 
<https://hackmd.io/1siVhjzOTWOE9ppdF_t57A>
   - evolution of PE
   - define "format" and format-specific values after this, e.g. docType/vct
   - followed by claims with format specific path objects (array of 
Strings instead of JSONPath)
   - merge vp_token and presentation_submission to vp_token contain 
identifiers from presentation_definition
   - simple examples for SD-JWT VC and mdoc
   - more complex examples with multiple credential requests
   - possiblity to request n of m credentials
   - possiblity to request n of m claims
   - complex examples are a little harder to read but easy to 
implement/process
Best regards,
Paul
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