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A line ending in a hollow diamond.
Also known as: Hollow diamond UML, Weak containment notation
The UML notation for aggregation, a whole-part relationship in which the part can outlive the whole.
Represents a whole-part relationship in which the part may exist independently of the whole.
Contexts: Technical drawing, Software
Is drawn with an unfilled diamond where composition uses a filled one, so the strength of ownership is carried by fill alone.
Contexts: Technical drawing, Software
A line ending in an unfilled diamond at the whole end of the relationship.