Found 6 document(s)
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Data provenance is extra information computed during query evaluation over databases, which provides additional context about query results. Several formal frameworks for data provenance have been proposed , in particula...
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Focused crawling aims at collecting as many Web pages relevant to a target topic as possible while avoiding irrelevant pages, reflecting limited resources available to a Web crawler. We improve on the efficiency of focus...
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We reconsider the problem of containment of monadic data- log (MDL) queries in unions of conjunctive queries (UCQs). Prior work has dealt with special cases, but has left the precise complexity character- ization open. W...
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This book explains Web standards for data management, with a focus on data distribution, providing a foundation for today's data integration applications and tomorrow's semantic Web. Striking a balance between the concep...
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The World Wide Web is dynamic by nature: content is continuously added, deleted, or changed, which makes it challenging for Web crawlers to keep up-to-date with the current version of a Web page, all the more so since no...
