UPDATE ......From Tuesday 8 April 2025 we have changed the way that Single Sign-on works on this wiki. Please see here for more information:
Update
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- Common Data Models: Using standardised schemas for identity attributesstandardised attributes, such as those defined by the W3C Verifiable Credentials Data Model, OpenID4VC etc, to ensure a “date of birth” or a "person identifier" field is interpreted the same way across systems.
- Ontology Alignment: Agreeing on the meaning of terms, such as what constitutes a “verified identity” or a “trusted issuer,” to avoid miscommunication.
- Interoperable Formats: Supporting formats like JSON-LD for credentials to ensure data can be read and processed by different identity wallets.
- Schemas for understanding credentials: E.g. ELM, OpenBadge, EMREX, ELMO, but also different isolated schemas at the national level. Need to interoperate with existing schemata
- Profiles:
- Need for (transport) protocol interop profile, e.g. see HAIP (High Assurance Interop Profile) or something more lightweight like DIIP (Decentralised Identity Interop Profile).
- Need for trust profile (e.g. OpenID for Research and Education (OpenID4RE) Project or OpenID Federation for Wallets architecture)
- National profiles (e.g. based on ELM)
Technical Interoperability
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