T-ODMG: an ODMG compliant temporal object model supporting multiple granularity management

  • Authors:

  • Elisa Bertino;Elena Ferrari;Giovanna Guerrini;Isabella Merlo

  • Affiliations:

  • Dipartimento di Scienze dell'Informazione, Università degli Studi di Milano, Via Comelico 39/41, 20135 Milano, Italy;Dipartimento di Scienze Chimiche, Fisiche e Matematiche, Università degli Studi dell'Insubria, Via Valleggio 11, 22100 Como, Italy;Dipartimento di Informatica, Università degli Studi di Pisa, via Buonarroti 2, 56127 Pisa, Italy;Dipartimento di Scienze dell'Informazione, Università degli Studi di Milano, Via Comelico 39/41, 20135 Milano, Italy

  • Venue:
  • Information Systems
  • Year:
  • 2003

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Abstract

In this paper we investigate some issues arising from the introduction of multiple temporal granularities in an object-oriented data model. Although issues concerning temporal granularities have been investigated in the context of temporal relational database systems, no comparable amount of work has been done in the context of object-oriented models. Moreover, the main drawback of the existing proposals is the lack of a formal basis--which we believe is essential to manage the inherent complexity of the object-oriented data model. In this paper, we define a comprehensive temporal object-oriented data model supporting multiple temporal granularities. We formally define the main notions of the data model such as types, legal values, classes, and objects. We address issues related to inheritance, type refinement, and substitutability. Finally, we describe the implementation of the presented model on top of an ODMG compliant DBMS.