Current approaches to the development of co-operative information systems are based on services to be offered by cooperating organizations and on the opportunity of building coordinators and brokers on top of such services. The quality of data exchanged and provided by different services hampers such approaches, as data of low quality can spread all over the co-operative system. In this paper, a service-based framework for managing data quality in cooperative information systems is presented. An XML-based model for data and quality data is proposed, and the design of a broker for data, which selects the best available data from different services, is presented. Such a broker also supports the improvement of data based on feed-backs to source services.
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