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Composition

A `*--` composition relationship — a filled-diamond "owns and controls the lifetime of" link.

3 examples across every diagram type

Read more in the Mermaid docs →
Class diagram, Zombie Mermaid Car + String model + start(): void Engine + int horsepower + rev(): void
Class diagramClass: Composition (*--)
Class diagram, Zombie Mermaid A B C D E F G H I J K L inheritance composition aggregation association dependency realization
Class diagramClass: All 6 Relationship Types
Class diagram, Zombie Mermaid Animal Dog Car Wheel Library Book Service Config Duck Swimmer Cart Item 1 0..* 1 4 holds 1 * reads 1 1..* * 1 1
Class diagramClass: Cardinalities on Every Relationship Kind