10. Motivation and Overview for an Ontological Framework
Chapter Outline
10.1 Motivation 107
10.2 Ontological Foundation 108
10.2.1 Individuals 109
10.2.2 Extensional Basis for Identity of Individuals 112
10.2.3 Possible Worlds 113
10.2.4 Extensional Identity for Classes/Sets 115
10.2.5 Relationships and Their Representation 117
10.3 A Data Model for the Ontological Foundations 119
10.4 Closing Remarks 121
In this chapter I will explain why an ontological framework is valuable in data modeling, and I will introduce the broad sweep of the four-dimensional framework I use, which is based on the work done by myself and others when we developed the data model for ISO 15926-2.
10.1. Motivation

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