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Sams Teach Yourself UML in 24 Hours, Third Edition by Joseph Schmuller

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Appendix . Important Definitions

Actor—An entity (a system or a person) that initiates a use case and/or benefits from a use case.

Aggregation—A specific type of association in which one class is a component of another. In an aggregation, the aggregate class can consist of more than one component class.

Association—A relationship between two classes.

Attribute—A property of a class. An attribute describes a range of values the property may hold in objects.

Class—A category or group of things that have similar attributes and common behaviors. A class is a template for creating objects.

Constraint—A rule you add to a UML diagram. To represent the rule you enclose it in curly brackets, as in {capacity = 16, 18, or 20 pounds}.

Domain—The conceptual area ...

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