Role change in database domains

Roelf J. Wieringa

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    Abstract

    In data modelling the universe of discourse (UoD) is divided up into classes having a taxonomic structure which is intended to express some of the structure inherent in the UoD. Some of these classes. for example the class of persons or departments, may be called "natural kinds," in that they are a fixed set of possible objects, existing in some possible state of the UoD, and all of which have a similar structure and behavior. Others have a more dynamic nature, such as the class of stu­ dents. Whereas an object is created as as person and, when it ceases to be a person, ceases to exist, an object may come to be a student and cease to be one without com­ ing into existence or passing away. A class like persons is a natural kind, and a class like students will be called roles in this report. This report studies the formal defini­ tion of roles and the resulting taxonomy of natural kinds and roles.
    Original languageUndefined
    Place of PublicationAmsterdam
    PublisherFree University, Department of Mathematics and Computer Science
    Number of pages33
    Publication statusPublished - 1989

    Publication series

    NameInformatica rapport / Faculteit der Wiskunde en Informatica
    PublisherFree University, Department of Mathematics and Computer Science
    No.IR-180

    Keywords

    • EWI-10721
    • IR-80768
    • SCS-Services

    Cite this

    Wieringa, R. J. (1989). Role change in database domains. (Informatica rapport / Faculteit der Wiskunde en Informatica; No. IR-180). Amsterdam: Free University, Department of Mathematics and Computer Science.