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In this paper, the authors present a three-level mediator based framework for linked data integration. In the approach, the mediated schema is represented by a domain ontology, which provides a conceptual representation of the application. Each relevant data source is described by a source ontology, published on the Web according to the Linked Data principles. Each source ontology is rewritten as an application ontology, whose vocabulary is restricted to be a subset of the vocabulary of the domain ontology. The main contribution of the paper is an algorithm for reformulating a user query into sub-queries over the data sources. The reformulation algorithm exploits inter-ontology links to return more complete query results. The approach is illustrated by an example of a virtual store mediating access to online booksellers.<\/p>","DOI":"10.4018\/jbdcn.2011040103","type":"journal-article","created":{"date-parts":[[2011,10,19]],"date-time":"2011-10-19T16:05:42Z","timestamp":1319040342000},"page":"29-47","source":"Crossref","is-referenced-by-count":4,"title":["Query Processing in a Mediator Based Framework for Linked Data Integration"],"prefix":"10.4018","volume":"7","author":[{"given":"V\u00e2nia M. P.","family":"Vidal","sequence":"first","affiliation":[{"name":"Federal University of Cear\u00e1, Brazil"}]},{"given":"Jos\u00e9 A. 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