The identification of objects and roles - Object identifiers revisited

The identification of objects and roles - Object identifiers revisited (1991)

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by Roel Wieringa , Wiebren de Jonge

Venue:	Technical Report IR-267, Faculty of Mathematics and Computer Science, Vrije Universiteit
Citations:	17 - 0 self

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Datum	Value	Source
TITLE	The identification of objects and roles - object identifiers revisited	INFERENCE
AUTHOR NAME	Roel Wieringa	SVM HeaderParse 0.1
AUTHOR AFFIL	Faculty of Mathematics and Computer Science, Vrije Universiteit	SVM HeaderParse 0.2
AUTHOR ADDR	De Boelelaan 1081a, 1081 HV, Amsterdam	SVM HeaderParse 0.1
AUTHOR NAME	Wiebren Jonge	SVM HeaderParse 0.1
AUTHOR AFFIL	Faculty of Mathematics and Computer Science, Vrije Universiteit	SVM HeaderParse 0.2
AUTHOR ADDR	De Boelelaan 1081a, 1081 HV, Amsterdam	SVM HeaderParse 0.1
ABSTRACT	In this paper we investigate several concepts that are known in database research for some time but which are still surrounded by some confusion. We start with the concepts of object identifier, surrogate and key and list the differences between these concepts, which in practice are often ignored. Sharpening these differences allows us to analyze the distinction between objects and roles that recently surfaced in the literature. Distinguishing objects from roles helps to avoid migration of objects between classes and thus the problems associated with it. We show that this distinction requires the use of role identifiers that, just as object identifiers, should be globally unique and unchangeable. We next show that using role identifiers requires a distinction between two essentially different kinds of inheritance relationships, is-a inheritance and played-by inheritance. These are often both treated as if they were one and the same kind of is-a relationship. The result of the discussion is a set of clear modeling concepts, which are independent of a particular language or implementation.	SVM HeaderParse 0.1
YEAR	1991	INFERENCE
VENUE	Technical Report IR-267, Faculty of Mathematics and Computer Science, Vrije Universiteit	INFERENCE
VENUE TYPE	CONFERENCE	INFERENCE
CITATIONS	28 found	ParsCit 1.0