Fig. 2: Formal workflow description and translated screenshots of local data access authorization of a query in an AKTIN data warehouse manager within a local node of the AKTIN infrastructure.

Errors in the federated data access authorization process (left) result in failed queries (right). Note: this diagram employs a modified version of BPMN, adapted to clarify specific workflow elements unique to the AKTIN infrastructure. This adaptation may not strictly adhere to formal BPMN guidelines.