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Research presented in this paper is a part of our ongoing work on GeoNis framework. GeoNis is framework for interoperability of GIS applications in local community environment. In this paper we introduce an approach for automatic generation of objectoriented model for handling ontology instances stored in relational databases. Central part of this approach is an algorithm that transforms application ontologies into appropriate object-oriented model. Using this approach we have developed a Data Access Layer Generat...