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To efficiently retrieve information from heterogeneous and distributed data sources has become one of the top priorities for institutions across the business world. Information from these sources needs to be integrated into one single system such that the user can retrieve the desired information through the integrated system by a single query. In this paper, we present a design and a prototype implementation of a system for schema integration of distributed databases. The method we developed is based on the hyper-graph data model (HDM). The integration process is accomplished using the HDM operations. User's queries are submitted to the integrated schema but executed on local databases via the mapping structure that is established in the schema integration phase.