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One of the major database research areas is Data Integration, which refers to providing users with a uniform view over a set of heterogeneous, distributed and autonomous data sources. Data Integration settings concern, for instance, mediator-based integration systems and P2P ones (named Peer Data Management Systems). In these settings, users pose their queries without having to spend time in searching the set of distributed data sources individually. To help matters, research on Data Integration environments has considered the use of semantic knowledge in the form of ontologies and contextual information.
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