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Traditional data interchange mechanisms are based on the client-server model, which has been confronted with a plethora of problems. For example, bilateral partners must exchange data sets through recognized protocols. Whenever the data set is updated, data interchange participants have to rebuild their protocols as well as applications. It is really a considerable problem for system maintenance or scalability. We propose an event-based data exchange model, called MEDEA, to solve the problems encountered by traditional data exchange systems. The designed MEDEA data exchange framework and the learned experiences are also detailed.