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A mediation layer for heterogeneous XML schemas

Abdelsalam Almarimi (Department of Computers, FEL, Czech Technical University, Karlovo nam 13, Praha 2, Czech Republic)
Jaroslav Pokorny (MFF, Department of Software Engineering, Charles University, Malostranske nam. 25, Praha 1, Czech Republic)

International Journal of Web Information Systems

ISSN: 1744-0084

Article publication date: 1 February 2005

271

Abstract

This paper introduces an approach to minimize the total designer effort for building XML data integration systems. Since fully automatic schema mapping generation is infeasible, in our view such an approach can be used as a semi‐automatic tool for XML schemas mediation. A method is proposed to query XML documents through a mediation layer. Such a layer is introduced to describe the mappings between global XML schema and local heterogeneous XML schemas. It produces a uniform interface over the local XML data sources, and provides the required functionality to query these sources in a uniform way. It involves two important units: the XML Metadata Document (XMD) and the Query Translator. The XMD is an XML document containing metadata, in which the mappings between global and local schemas are defined. The XML Query Translator which is an integral part of the system is introduced to translate a global user query into local queries by using the mappings that are defined in the XMD.

Keywords

Citation

Almarimi, A. and Pokorny, J. (2005), "A mediation layer for heterogeneous XML schemas", International Journal of Web Information Systems, Vol. 1 No. 1, pp. 25-33. https://doi.org/10.1108/17440080580000080

Publisher

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Emerald Group Publishing Limited

Copyright © 2005, Emerald Group Publishing Limited

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