Using the DAWG Test Cases With Relational Databases

As the Semantic Web has matured, it has become it has become clear that there is a need to integrate older technologies. One such technology is relational databases. There have been a few attempts to make relational databases semantically searchable using SPARQL. These include Free University of Berlin's D2RQ1 and BBN's Semantic Bridge for Relational Databases (SBRD). Both allow SPARQL queries to be posed to a relational database, but how do they hold up against the W3C RDF Data Access Working Group (DAWG) test cases? As this question was evaluated, a new question arose: How well do the DAWG test cases apply to these tools?