Conceptual Modeling of Aggregation: an Exploration

TL;DR

This paper explores the conceptual modeling of aggregation in software engineering, proposing a semantic assembly model using the thinging machine to clarify and extend the understanding of aggregation, including behavioral aspects.

Contribution

It introduces a novel ontological model called the thinging machine that enhances the semantic clarity of aggregation, including behavioral aggregation, in domain modeling.

Findings

Proposes the thinging machine model for better aggregation representation

Extends aggregation to include behavioral aspects

Provides ontological clarity on aggregation concepts

Abstract

This paper is about conceptual modeling of aggregates in software engineering. An aggregate is a cluster of domain objects that can be treated as a single unit. In UML, an aggregation is a type of association in which objects are configured together to form a more complex object. It has been described as one of the biggest betes noires in modeling. In spite of its widespread use, aggregation seems a troublesome concept. It is sometimes treated as part-of; however, the part-of relation is only one of many possible aggregation mechanisms and is itself problematical, partly because of its diverse semantics. The purpose of this paper is to develop a semantic assembly model that is useful to represent relationships in the domain and achieve various levels of interoperability among software. The paper contributes to ontological conceptual clarity about aggregation, based on a model called a thinging machine (TM). The TM model uses so-called thimacs (things/machines) as building blocks for describing the domain. Thus, the notion of aggregation is extended to behavioral aggregation, in which individual entities collectively behave as a unit. The results point to a promising contribution to the understanding of the notion of aggregation compared to the ontological positions that are based on substance or relation.