Composition does not allow an object to be part of more than one aggregate object.

More Questions from Object-Oriented Data Modeling

• A method defines the form or protocol of the operation, but not its implementation.
• An object's state is determined by its attribute values and links to other objects.
• The UML notation is useful for graphically depicting an object-oriented analysis or design model.
• A derived element is typically shown by placing either a slash (/) or a stereotype of < > before the name of the element.
• A class is a concept, abstraction, or thing that makes sense in an application context.
• An operation that alters the state of an object is known as a constructor operation.
• In UML, a class is represented by a rectangle with three compartments separated by vertical lines.
• When a business rule involves three or more graphical symbols, you can show the constraint as a note and attach the note to each of the symbols by a dashed line.
• A solid diamond represents a stronger form of aggregation, known as composition.
• In an object diagram, an object is represented as a rectangle with two compartments.

Discussion & Comments