1,720,974 research outputs found
Object-Oriented Database. ECOOP Workshops
No full textThe goal of the First ECOOP Workshop on Object-Oriented Databases was to bring together researchers working in the field of object-oriented databases, to discuss the work which is going on. The aim of the workshop was twofold: to discuss the current status of research in the field and to critically evaluate object-oriented database systems in terms of their current usage, of their successes and limitations, and their potential for new applications. The workshop thus consisted of a number of presentations of reviewed papers and of discussions on the topics mentioned above
Extending the ODMG Object Model with Time
No full textAlthough many temporal extensions of the relational data model have been proposed, there is no comparable amount of work in the context of object-oriented data models. Moreover, extensions to the relational model have been proposed in the framework of SQL standards, whereas no attempts have been made to extend the standard for object-oriented databases, defined by ODMG. This paper presents T ODMG, a temporal extension of the ODMG-93 standard data model. The main contributions of this work are, thus, the formalization of the ODMG standard data model and its extension with time. Another contribution of this work is the investigation, on a formal basis, of the main issues arising from the introduction of time in an object-oriented model
A Temporal Object-Oriented Data Model with Multiple Granularities
No full textIn this paper we investigate some issues arising from the introduction of multiple temporal granularities in an objectoriented 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 provide a complete temporal object-oriented type system supporting multiple temporal granularities and we formally define the set of legal values for our type system. We then address issues related to inheritance, type refinement and substitutability. 1. Introduction Conventional database systems do not offer the possibility of dealing with time-varying data. The content of a database represents a snapshot of the reality in that only the ..
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