The configuration of the "default graph" as defined in SPARQL is currently fixed and includes all statements, disregarding any context information they have. Other use cases require an alternative configuration where the default graph only matches statements without context information. It should be possible to create repositories with either configuration.
Reverted back to original scope. Default graph scope will be made configurable per repository to suite various use cases. Test case failures will be communicated with the RDF data access working group.