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Ontology-Based Query Processing for Global Information Systems : The Springer International Series in Engineering and Computer Science - Eduardo Mena

Ontology-Based Query Processing for Global Information Systems

The Springer International Series in Engineering and Computer Science

Hardcover Published: 31st July 2001
ISBN: 9780792373759
Number Of Pages: 215

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Today we are witnessing an exponential growth of information accumulated within universities, corporations, and government organizations. Autonomous repositories that store different types of digital data in multiple formats are becoming available for use on the fast-evolving global information systems infrastructure. More concretely, with the World Wide Web and related internetworking technologies, there has been an explosion in the types, availability, and volume of data accessible to a global information system. However, this information overload makes it nearly impossible for users to be aware of the locations, organization or structures, query languages, and semantics of the information in various repositories.
Available browsing and navigation tools assist users in locating information resources on the Internet. However, there is a real need to complement current browsing and keyword-based techniques with concept-based approaches. An important next step should be to support queries that do not contain information describing location or manipulation of relevant resources.
Ontology-Based Query Processing for Global Information Systems describes an initiative for enhancing query processing in a global information system. The following are some of the relevant features:

  • Providing semantic descriptions of data repositories using ontologies;
  • Dealing with different vocabularies so that users are not forced to use a common one;
  • Defining a strategy that permits the incremental enrichment of answers by visiting new ontologies;
  • Managing imprecise answers and estimations of the incurred loss of information.
In summary, technologies such as information brokerage, domain ontologies, and estimation of imprecision in answers based on vocabulary heterogeneity have been synthesized with Internet computing, representing an advance in developing semantics-based information access on the Web. Theoretical results are complemented by the presentation of a prototype that implements the main ideas presented in this book.
Ontology-Based Query Processing for Global Information Systems is suitable as a secondary text for a graduate-level course, and as a reference for researchers and practitioners in industry.

List of Figuresp. ix
List of Tablesp. xi
Prefacep. xiii
Acknowledgmentsp. xv
Introductionp. 1
Rationalep. 1
From Federated DBMSs to the Webp. 3
Overview of the Problemp. 4
Summaryp. 7
Technological Contextp. 9
Distributed Environmentsp. 9
Ontologiesp. 15
Related Workp. 32
Summaryp. 44
Architecture for Query Processingp. 47
A motivating examplep. 47
Global Description of the Architecturep. 49
The Ontology Serverp. 51
The Interontology Relationships Managerp. 55
The Query Processorp. 66
Summaryp. 75
Accessing Underlying Data Repositoriesp. 77
Logical Schemas, Data Repositories, and Data Sourcesp. 77
Mappings: Key to Repository Heterogeneity Encapsulationp. 86
Main Steps in Accessing Underlying Data Repositoriesp. 93
Correlationp. 111
Presentationp. 115
Summaryp. 116
Incremental Query Expansion to Multiple Ontologiesp. 117
Integration of User and Target Ontologiesp. 118
Plans with No Loss of Informationp. 125
Plans with Loss of Informationp. 135
Summaryp. 146
Estimating the Loss of Informationp. 147
Measure of Loss Based on Intensional Informationp. 148
Measure of Loss Based on Extensional Informationp. 151
Example: Measurement of the Extensional Lossp. 164
Loss for the Correlated Answer Across Ontologiesp. 167
Translation with Loss for Roles to Be Projectedp. 170
Summaryp. 172
The OBSERVER Prototypep. 173
Architecture of the Prototypep. 173
Ontologies: Describing Domains About Bibliographic Referencesp. 175
The Interontology Relationships Managerp. 177
The Query Processorp. 178
The Ontology Serverp. 181
Testing OBSERVER: Data Retrieved for the Examplesp. 192
Summaryp. 195
Summaryp. 197
Main Contributionsp. 198
Features Missing in Our Approachp. 200
Bibliographyp. 203
Indexp. 213
Table of Contents provided by Syndetics. All Rights Reserved.

ISBN: 9780792373759
ISBN-10: 0792373758
Series: The Springer International Series in Engineering and Computer Science
Audience: Professional
Format: Hardcover
Language: English
Number Of Pages: 215
Published: 31st July 2001
Publisher: Springer
Country of Publication: NL
Dimensions (cm): 23.5 x 15.5  x 1.91
Weight (kg): 1.12