Query reformulation for an XML-based data integration system

Authors:
Bernadette Farias Lóscio;Thiago Costa;Ana Carolina Salgado
Affiliations:
Ceará State University, Itaperi, Fortaleza - CE, Brazil;Federal University of Pernambuco, Cidade Universitária, Recife - PE, Brazil;Federal University of Pernambuco, Cidade Universitária, Recife - PE, Brazil
Venue:
Proceedings of the 2006 ACM symposium on Applied computing
Year:
2006

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Abstract

The main objective of a mediator-based data integration system is to provide a unified view of several distributed and heterogeneous data sources. This view, called mediation schema, corresponds to a set of elements computed from data available on the local data sources. One of the biggest challenges facing a data integration system consists in answering a user query submitted in terms of the mediation schema given that the data is at the sources. This problem consists mainly in reformulating the query in terms of the source schemas and in integrating the corresponding answers. In this paper we address the problem of query reformulation in the context of an XML-based data integration system. Our solution is based on algorithms that generate a set of source queries considering a given user query and a set of mappings between the mediation schema and the data source schemas.