An object-oriented framework for reconciliation and extraction in heterogeneous data federations

  • Authors:

  • Herman Balsters;Engbert O. de Brock

  • Affiliations:

  • Faculty of Management and Organization, University of Groningen, Groningen, The Netherlands;Faculty of Management and Organization, University of Groningen, Groningen, The Netherlands

  • Venue:
  • ADVIS'04 Proceedings of the Third international conference on Advances in Information Systems
  • Year:
  • 2004

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Abstract

Two major problems in constructing database federations concern achieving and maintaining consistency and a uniform representation of the data on the global level of the federation. The process of creation of uniform representations of data is known as data extraction, whereas data reconciliation is concerned with resolving data inconsistencies. Our approach to constructing a global, integrated system from a collection of (semantically) heterogeneous component databases is based on the concept of exact view. We will show that a global database constructed by exact views integrates component schemas without loss of constraint information. We shall describe a semantic framework for specification of database federations based on the UML/OCL data model. In particular, we will show that we can represent exact views by so-called derived classes in UML/OCL, providing the means to resolve in a combined setting data extraction and reconciliation problems on the global level of the federation.