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Expression

Alternatively, the joinSpec may consist of an Expression with the name of a single Boolean operator and no operands specified. In this case, the value of the joinSpec shall be given by applying the given operator to Boolean values indicating ...

Source
Unified Modeling Language 2.5.1

UML2 ValueSpecification - metaclasses - ADVANCED REFERENCE ONLY

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The String value of a StringExpression is obtained by concatenating, in order, the String values of either the operands or the subExpressions, depending on which is given.

Source
Unified Modeling Language 2.5.1

The substrings are given as either a list of LiteralString operands or as a list of StringExpression subExpressions (but it is not allowed to mix the two).

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Unified Modeling Language 2.5.1

A StringExpression is an Expression that specifies a String value that is derived by concatenating a list of substrings.

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Unified Modeling Language 2.5.1

Expressions are ValueSpecifications that specify values resulting from a computation.

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Unified Modeling Language 2.5.1

fUML-1.4 EXCLUDES Expression

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