With the growing of the Internet, lots of heterogeneous relational databases are built in distributed environment. Data exchange between these databases absorbs more attention of researchers and engineers nowadays than ever. As a well-formed makeup language, XML is suitable to store and transfer information. Therefore we investigate the data exchange method via XML in this paper. We analyze mapping techniques between XML schema and relational database. Then, an effective method for data exchange is described in detail. Finally we design and implement a data exchange system by Java and DOM interface technology. It works well in a real commercial web application.
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