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Web query processing is hot issue in heterogeneous database access. Performance of web query processing is become slowly due to increasing number of data. A good methodology is needed to improve web query processing in heterogeneous database. In this research, intelligent algorithm and XML was created and implemented for accessing heterogeneous database. The heterogeneous database means data sources allocated at different places. Then, these data source will integrate in order to allow web users access all data. The main function of the intelligent algorithm is to search and retrieve only related data based on queries from web users. Meanwhile, the main function of XML is to map directly to data sources that contain related data. Prototype architecture based on the intelligent algorithm and XML was designed.
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