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Nowadays XML-based data integration systems are accepted as data service providers on the web. Currently the user is permitted to submit updates. Therefore it is necessary to establish the best possible data consistency in the whole data integration system. To that extend, the authors present an approach based on an XQuery trigger service. In the XQuery trigger service trigger termination should be ensured. The trigger analyzing problem is mainly discussed in this paper. They first define the three categories of trigger dependence including total independence, possible dependence and definite dependence.
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