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Abstract: Typically data integration systems have significant gaps of coverage over the global (or mediated) schema they purport to cover. Given this reality, users are interested in knowing exactly which part of their query is supported by the available data sources. This report introduces a set of assumptions which enable users to obtain intensional descriptions of the certain, uncertain and missing answers to their queries given the available data sources. The general assumption is that query and... (Update)
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BibTeX entry: (Update)
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title = "Unknown",
url = "citeseer.ist.psu.edu/701199.html" }
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