Publication Type

Conference Proceeding Article

Version

publishedVersion

Publication Date

4-1997

Abstract

To support future digital library systems which draw information from different sources on the internet, we have to provide integrated queries to pre-existing database servers which contain structured, semi-structured and unstructured data. In this paper, we specifically examine the problem of querying both existing structured relational databases and bibliographic databases. By adopting the well-accepted Z39.50 standard protocol to access bibliographic databases in different legacy library systems, we have developed an extended SQL model, known as HarpSQL, to support integrated queries to both SQL databases and bibliographic databases. Using HarpSQL, one can not only query bibliographic databases in an SQL manner, but also perform join(s) between SQL and bibliographic databases. A distributed query processor supporting HarpSQL queries has been developed. We will present our query processing strategy that is based on client-server interaction model between the distributed query processor and the various remote database servers.

Keywords

Digital libraries, Internet databases, Interoperable databases

Discipline

Databases and Information Systems | Numerical Analysis and Scientific Computing

Publication

Database Systems for Advanced Applications '97: Proceedings of the Fifth International Conference on Database Systems for Advanced Applications: Melbourne, April 1-4, 1997

First Page

441

Last Page

450

ISBN

9789812819536

Identifier

10.1142/9789812819536_0046

Publisher

World Scientific

City or Country

Singapore

Additional URL

http://doi.org/10.1142/9789812819536_0046

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