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The vision of the semantic Web is to give data on the Web a well-defined meaning by representing it in RDF and linking it to commonly accepted ontologies. Today, most data are stored in relational databases. To be able to use these data on the semantic Web we need a flexible but easy to use mechanism to convert relational data to RDF data. In this paper, we present an approach on transformation of relational model to RDF model. It goes through two steps including extracting the semantics of relational model and mapping to RDF model. Finally, we consider the quality of transformation and give the implementation results.