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The Deep Web continues to grow rapidly, which makes exploiting useful information a remarkable challenge. Metaquerier, which provides a uniform integrated interface to the users and can query multiple databases simultaneously, is becoming the main trend for Deep Web data integration. Query translation plays an important role in a metaquerier. However, due to the large-scale, heterogeneity and autonomy of the Web databases, automatic query translation is challenging. One of the important aspects is that Web database interfaces may express different predicate logics.
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