Research On XML-Based Middleware For Data Integration

Data integration is the demand of coordination between not only different enterprises but different departments inside them, and the goal is to realize data sharing between heterogeneous data sources, so as to utilize resources effectively and attain high performance of the whole application system.Today with the development of the technology for the computer especially computer network, traditional technology of data integration, such as multidatabase technology, can not meet the demand of applications for mass datas and new kinds of datas. New technology is needed in today's data integration system, which can integrate datas not only from database systems but also from other systems, and can integrate not only the traditional structure datas but also semi-structure even un-structure datas.In this paper, against above backgrounds, we first introduce the state of research for data integration and problems, and then analyze the feasibility of heterogeneous data integration based on XML from the view of middleware and XML technology in both data model and data exchange specification. Finally, based on these analyses, we put forward a model of data integration middleware and stress the problem of how to realize the view definition for heterogeneous database systems based on XML and the problem of query processing.The character for XML showed in this model, which includes platform independence, easy for expansion, better interaction, abundance semantic, make the middleware model easy for the realization of description and transform for heterogeneous data sources in the field of data integration, and solve the problems of scarcity for union query optimization and poor ability for integration expansion with heterogeneous data sources based on Web perfectly.