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Essential, Mandatory, and Shared Parts in Conceptual Data Models

Essential, Mandatory, and Shared Parts in Conceptual Data Models
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Author(s): Alessandro Artale (Free University of Bozen-Bolzano, Italy) and C. Maria Keet (Free University of Bozen-Bolzano, Italy)
Copyright: 2009
Pages: 36
Source title: Innovations in Information Systems Modeling: Methods and Best Practices
Source Author(s)/Editor(s): Terry Halpin (Neumont University, USA ), John Krogstie (SINTEF, Norway ) and Erik Proper (Radboud University Nijmegen,The Netherlands)
DOI: 10.4018/978-1-60566-278-7.ch002

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Abstract

This chapter focuses on formally representing life cycle semantics of part-whole relations in conceptual data models by utilizing the temporal modality. The authors approach this by resorting to the temporal conceptual data modeling language ERVT and extend it with the novel notion of status relations. This enables a precise axiomatization of the constraints for essential parts and wholes compared to mandatory parts and wholes, as well as introduction of temporally suspended part-whole relations. To facilitate usage in the conceptual stage, a set of closed questions and decision diagram are proposed. The longterm objectives are to ascertain which type of shareability and which lifetime aspects are possible for part-whole relations, investigate the formal semantics for sharability, and how to model these kind of differences in conceptual data models.

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