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- Updating Relational Data via SPARQL/Update + (Future work is planned for various aspects … Future work is planned for various aspects of OntoAccess. Further research needs to be done on bridging the conceptual gap between RDBs and the Semantic Web. Ontology- based write access to the relational data creates completely new challenges on this topic with respect to read-only approaches. The presence of schema constraints in the database can lead to the rejection of update requests that would otherwise be accepted by a native triple store. A feedback protocol that provides semantically rich information about the cause of a rejection and possible directions for improvement plays a major role in bridging the gap. Other database constraints such as assertions have to be evaluated as well to see if they can reasonably be supported in the mapping. Also, a more formal definition of the mapping language will be provided. Furthermore, we will extend our prototype implementation to support the SPARQL/Update MODIFY operation, SPARQL queries, and the just mentioned feedback protocol.and the just mentioned feedback protocol.)