Igrantio dcql claim sets

Skill L3-iGrant/skills/workflows/igrantio-dcql-claim-sets

DCQL pattern: claim_sets with fallback for selective disclosure - prefer a minimal boolean claim (is_over_21) and fall back to birth_date only when the preferred claim is unavailable, in an OpenID4VP verification of a PID SD-JWT on the iGrant.io Organisation Wallet Suite. Data-minimised age verification for EUDI Wallet (EUDIW) under eIDAS 2.0 and GDPR.From its SKILL.md

Install

npx -y skills add L3-iGrant/skills --skill igrantio-dcql-claim-sets

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SKILL.md

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DCQL: claim sets (preferred claim with fallback)

Scenario

A verifier needs an age check. It prefers the minimal boolean is_over_21; if the wallet's PID lacks it, the query falls back to birth_date. claim_sets are ordered - the wallet satisfies the first set it can.

Before you build: run the integrator intake in igrantio-ows-overview - environment, API key, tenancy, backend host, webhooks, frontend - one question at a time, a recommended default with each.

The DCQL query

{
  "credentials": [
    {
      "id": "pid",
      "format": "dc+sd-jwt",
      "meta": {
        "vct_values": [
          "eu.europa.ec.eudi:pid.1"
        ]
      },
      "claims": [
        {
          "id": "over_21",
          "path": [
            "is_over_21"
          ]
        },
        {
          "id": "birthdate",
          "path": [
            "birth_date"
          ]
        }
      ],
      "claim_sets": [
        [
          "over_21"
        ],
        [
          "birthdate"
        ]
      ]
    }
  ]
}

Run it on OWS

Store the query as a presentation definition, keep the presentationDefinitionId (igrantio-ows-overview api-reference §3).
Send the verification request (v3), render QR / DC API, await presentation_acked with verified === true (api-reference §2).
Read the disclosed claim from presentation[0] - handle BOTH shapes: the boolean, or a birthdate you must compare yourself.

Adjust for your deployment

Change the threshold claim (is_over_18, is_over_65) and path to match your PID profile; vct_values to your PID VCT.
Order claim_sets most-minimal first - that is the point of the pattern.
If regulators forbid receiving birthdate, drop the fallback set and handle "no match" in UX instead.

Cross-references

igrantio-eu-age-verification - the mdoc age attestation profile (boolean-only, no fallback).
igrantio-dcql-credential-sets - alternatives across credentials rather than claims.

Source of truth

This workflow mirrors https://docs.igrant.io/docs/dcql-2-4-2-claim-set-age-verification/ (query detailed in https://docs.igrant.io/concepts/eudi-wallet-dcql-openid4vp-business-wallet-payments/, §2.4.2). Before implementing, fetch the doc page; if it disagrees with this skill, the documentation wins - follow it and report the drift so the skill can be updated.

What ships with it

Read from the repository

Just SKILL.md. No reference files, no scripts.