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Converting web data to semantic format is an important task for the next generation of the web. A huge amount of web data is stored in databases. Moreover, many approaches have been proposed to map between DB and web ontologies. This paper proposes an approach to convert DB to RDF with extra user-defined rules. These extra rules, which extend the original data, enable semantic query engines to answer more queries. The proposed approach generates not only RDF data based on the mapping of DB to RDF but also extra discovered relations based on user-defined rules. A prototype for the proposed approach is implemented to show the feasibility of the proposed idea.