Walder

Walder configures routes in YAML and delegates querying and federation to Comunica, which sends each pattern to every listed source and joins on shared variables.

It cannot be tested here because of the OpenCitations SPARQL endpoints: on a bare GET they return the HTML query form instead of a SPARQL service description, so Comunica’s auto-detection does not recognise them as SPARQL endpoints.

• A simple request, the join, output: untested, for the reason above.

• Pagination, versioning, authentication: not supported.

• API description: the config is written in the OpenAPI structure, but no derived spec is exposed.