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The goal of information integration is to provide uniform access interface to a set of heterogeneous and autonomous information sources. In this paper, an information integration framework is implemented to meet this goal using the technologies of grid and XML in two steps: schema integration and instance integration. This paper describes this framework in details, presents an Information Description Markup Language (IDML) to realize the unified description of heterogeneous information, and proposes an algorithm for XML schema matching to validate the feasibility of schema matching. Finally the computational experiments show that the proposed approach has a high degree of accuracy.