RDBMSs have shown also their ability to handle vast amounts of data veryefficiently using powerful indexing mechanisms [Sak 10].In the following table, we present some examples of work that exist in this contextWork Structure Ontology model Database scheme[2] RDF suite RDFs Object-Relational[16] Sesame RDFs Various[73] DLDB DAML+OIL Relational[105] rdfDB RDF Relational[82] RDFStore RDF Relational[