Igrantio Schema Discovery

Find a credential schema or DCQL query

When to use

Use this skill when you must issue or verify a credential type and no igrantio-credential-schema-* or igrantio-dcql-query-* skill covers it. The steps below tell you where to look, in order.

Step 1: the iGrant.io verifiable data registry

The registry is the source for the template skills in this collection:

• Credential schemas (claim path pointer documents): https://github.com/decentralised-dataexchange/verifiable-data-registry/tree/main/credentialSchemas/claimPathPointer
• DCQL query templates: https://github.com/decentralised-dataexchange/verifiable-data-registry/tree/main/presentationDefinitions/dcqlQuery

Each template holds one directory per version. Take the latest version directory. It holds one schema file and one metadata file per credential format. The registry can hold templates that are newer than the skills in this collection, so check it even when a skill exists.

Step 2: the WE BUILD attestation rulebooks catalog

If the credential type is not in the iGrant.io registry, check the WE BUILD attestation rulebooks catalog:

https://github.com/webuild-consortium/webuild-attestation-rulebooks-catalog

The catalog collects attestation rulebooks for the European Business Wallet ecosystem. A rulebook defines the attestation: its attribute names, formats, and namespaces. When you find a rulebook for your credential type, build the claim path pointer document from its attribute definitions:

• One claims[] entry per attribute.
• For mso_mdoc, the first element of each path array is the namespace from the rulebook; the second is the attribute name.
• For dc+sd-jwt, the path array holds the claim name path and the rulebook gives the vct value.
• Set mandatory and limitDisclosure per attribute as the rulebook requires.

Then create the credential definition with the credentialDefinitions[] approach and version: version_01. Read igrantio-api-issuer for the operation, or igrantio-api-verifier to build the matching DCQL query.

Step 3: no rulebook exists

If neither source covers the credential type, define your own claim path pointer document with the fields above, and propose it to the registry with a pull request.

Sources are the truth

Both catalogs move faster than this skill. Always fetch the linked repositories to check for new or updated templates and rulebooks before you conclude that a schema does not exist.