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The authors present the WebContent platform for managing distributed repositories of XML and semantic Web data. The platform allows integrating various data processing building blocks (crawling, translation, semantic annotation, full-text search, structured XML querying, and semantic querying), presented as Web services, into a large-scale efficient platform. Calls to various services are combined inside ActiveXML documents, which are XML documents including service calls. An ActiveXML optimizer is used to: Efficiently distribute computations among sites; perform XQuery-specific optimizations by leveraging an algebraic XQuery optimizer; and given an XML query, chose among several distributed indices the most appropriate in order to answer the query.
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