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Unified Modeling Language Reference Manual, The, Second Edition by Grady Booch, Ivar Jacobson, James Rumbaugh

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list

An ordered variable-length collection of model elements owned by and nested within another model element; an ordered bag.

See also classifier, multiplicity, state.

Semantics

The word list is a shorthand for an ordered bag, that is, an ordering sequence of values in which the same value may appear more than once (formally, a mapping from a subset of the positive integers to the elements of a set). It corresponds to setting the multiplicity properties isUnique=false and isOrdered=true. A set without duplicates whose elements have a relative ordering is called an ordered set. The word list implies that duplicate values may occur.

A classifier contains several lists of subordinate elements, including attributes, operations, and methods. A state ...

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