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Evaluating Possibilistic Valid-Time Queries

  • Christophe Billiet
  • José Enrique Pons
  • Olga Pons Capote
  • Guy De Tré
Part of the Communications in Computer and Information Science book series (CCIS, volume 297)

Abstract

A temporal database schema models objects or concepts with time-related or time-variant properties and a derived database contains measurements or descriptions concerning these temporal properties. The modelling of temporal information in a temporal database has an impact on the consistency of the database. Of course, this temporal information can be queried. In some cases, information in the query’s temporal demand is (partially) unknown. This paper presents a technique for querying a valid-time relation using, among others, a temporal constraint in which the time indication in the temporal expression contains uncertainty and a method for evaluating such queries. This should allow querying using a (partially) unknown temporal demand.

Keywords

valid-time database uncertainty ill-known intervals uncertain temporal querying 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  • Christophe Billiet
    • 1
  • José Enrique Pons
    • 2
  • Olga Pons Capote
    • 2
  • Guy De Tré
    • 1
  1. 1.Department of Telecommunications and Information ProcessingGhent UniversityGhentBelgium
  2. 2.Department of Computer Science and Artificial IntelligenceEscuela Técnica Superior de Ingeniería Informática, Universidad de GranadaGranadaSpain

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