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Ontologies play a central role in current efforts aimed at developing a semantic web by enriching the web with machine interpretable content and interoperable resources and services. In such a setting, instead of a single, centralized ontology, it is much more realistic to have multiple, independently developed, distributed ontology modules that cover different, perhaps partially overlapping, domains of expertise. However, many application scenarios require selective, and perhaps context-sensitive use of knowledge from multiple ontology modules with the help of ontology mappings.
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