Multiplicity in UML: DRM Examples

Polygon

Base Vertex

* means 0 or more,

sometimes called many.

If the word {ordered} is used, then the set of objects is ordered; otherwise it is unordered.

For example - a <Polygon> contains 3 or more <Base Vertices>, which are ordered. A <Base Vertex> may belong to many <Polygons>, or none.A <Union of Primitive Geometry> contains 1 or more <Primitive Geometry> objects, which are ordered. A <Primitive Geometry> object must belong to at least one <Union of Primitive Geometry>, but may belong to many.

3..*

1..*

1..*

N..* means N or more.

*

Primitive Geometry

Union of Primitive Geometry

{ordered}

{ordered}

DRM Diagram - Sheets 4, 5

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