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.
