Gesellschaft fr Informatik e.V.

Lecture Notes in Informatics


Information Systems Technology and its Applications, 3rd International Conference ISTA'2004, June 15-17, 2004, Salt Lake City, Utah, USA P-48, 123-136 (2004).

GI, Gesellschaft für Informatik, Bonn
2004


Editors

Terry A. Halpin, Stephen W. Liddle, Heinrich C. Mayr Anatoly E. Doroshenko (eds.)


Copyright © GI, Gesellschaft für Informatik, Bonn

Contents

Combining the best of global-as-view and local-as-view for data integration

Li Xu and David W. Embley

Abstract


Currently, there are two main basic approaches to data integration: Globalas-View (GAV) and Local-as-View (LAV). However, both GAV and LAV have their limitations. In a GAV approach, changes in information sources or adding a new information source requires revisions of a global schema and mappings between the global schema and source schemas. In a LAV approach, automating query reformulation has exponential time complexity with respect to query and source schema definitions. To resolve these problems, we offer TIQS as an alternative point of view that is neither GAV nor LAV. The approach uses source-to-target mappings based on a predefined conceptual target schema, which is specified ontologically and independently of any of the sources. The proposed data integration system is easier to maintain than both GAV and LAV, and query reformulation reduces to rule unfolding. Compared with other data integration approaches, our approach combines the advantages of GAV and LAV, mitigates the disadvantages, and provides an alternative for flexible and scalable data integration.


Full Text: PDF

GI, Gesellschaft für Informatik, Bonn
ISBN 3-88579-377-6


Last changed 24.01.2012 21:46:07