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A line ending in a filled diamond.
Also known as: Filled diamond UML, Strong containment notation
The UML notation for composition, a whole-part relationship in which the part does not outlive the whole.
Represents a whole-part relationship in which the part is destroyed with the whole.
Contexts: Technical drawing, Software
Differs from aggregation only by the fill of the diamond, though the difference is a statement about object lifetime and has direct consequences in code.
Contexts: Technical drawing, Software
A line ending in a solid filled diamond at the whole end of the relationship.