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Contribution Details

Type Technical Report
Scope Discipline-based scholarship
Title OntoAccess - An Extensible Platform for RDF-based Read and Write Access to Relational Databases
Organization Unit
  • Matthias Hert
  • Gerald Reif
  • Harald Gall
  • English
Number IFI-2012.05
Date 2012-01-01
Abstract Text Relational Databases (RDBs) are used in most current enterprise environments to store and manage data. The semantics of the data is not explicitly encoded in the relational model, but implicitly at the application level. Ontologies and Semantic Web technologies provide explicit semantics that allows data to be shared and reused across application, enterprise, and community boundaries. Converting all relational data to RDF is often not feasible, therefore we adopt a mediation approach for RDF-based access to RDBs. Existing RDB-to-RDF mapping approaches focus on read-only access via SPARQL or Linked Data but other data access interfaces exist, including approaches for updating RDF data (e.g., Semantic Web frameworks such as Jena, Sesame, and RDF2Go; ChangeSet). In this paper we present OntoAccess, an extensible platform for RDF-based read and write access to existing relational data. It encapsulates the translation logic in the core layer that provides the foundation of an extensible set of data access interfaces in the interface layer. We further present the formal definition of our RDB-to-RDF mapping, the architecture and implementation of our mediator platform, a semantic feedback protocol to bridge the conceptual gap between the relational model and RDF as well as a performance evaluation of the prototype implementation.
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