Integrating Implicit Answers with Object-Oriented Queries.

Hava T. Siegelmann, B. R. Badrinath: Integrating Implicit Answers with Object-Oriented Queries. VLDB 1991: 15-24

@inproceedings{DBLP:conf/vldb/SiegelmannB91,
  author    = {Hava T. Siegelmann and
               B. R. Badrinath},
  editor    = {Guy M. Lohman and
               Am\'{\i}lcar Sernadas and
               Rafael Camps},
  title     = {Integrating Implicit Answers with Object-Oriented Queries},
  booktitle = {17th International Conference on Very Large Data Bases, September
               3-6, 1991, Barcelona, Catalonia, Spain, Proceedings},
  publisher = {Morgan Kaufmann},
  year      = {1991},
  isbn      = {1-55860-150-3},
  pages     = {15-24},
  ee        = {db/conf/vldb/SiegelmannB91.html},
  crossref  = {DBLP:conf/vldb/91},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}

Abstract

Queries in object-oriented databases are formulated against a class and retrieve instances of the class satisfying a certain predicate on the attributes of the class. The presence of a class hierarchy, an integral part of any object-oriented datamodel, allows answers to be expressed implicitly in terms of classes and instances. This enables answers to be provided at different levels of abstraction. Shum and Muntz [SM88] presented a way of providing implicit expressions based on a taxonomy defined over the database. The algorithm presented in [SM88] is optimal in the length of the answer but the clarity of the answer is often poor. In this paper, the focus is on coherent answers: implicit answers that are not necessarily optimal in the number of terms but are easy to comprehend. We show that a unique coherent answer can be obtained efficiently in a top downmanner. Since the objective is to provide coherent answers, and user queries are formulated by means of query operators to access the database, the standard query operators are redefined to obtain and manipulate coherent answers. Coherent answers are useful in coping with information complexity as they allowanswers to be represented abstractly and are also a useful representation tool for complex information systems.

Copyright © 1991 by the VLDB Endowment. Permission to copy without fee all or part of this material is granted provided that the copies are not made or distributed for direct commercial advantage, the VLDB copyright notice and the title of the publication and its date appear, and notice is given that copying is by the permission of the Very Large Data Base Endowment. To copy otherwise, or to republish, requires a fee and/or special permission from the Endowment.

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Printed Edition

Guy M. Lohman, Amílcar Sernadas, Rafael Camps (Eds.): 17th International Conference on Very Large Data Bases, September 3-6, 1991, Barcelona, Catalonia, Spain, Proceedings. Morgan Kaufmann 1991, ISBN 1-55860-150-3

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