Note: There is a newer version of this specification see VEC 2.0.1

A CustomUnit can be used to define "FreeText"-Units. Custom units must not be used for units that can be expressed by any of the other subclasses of Unit. Custom units are only allowed if a unit is needed that cannot be handled by any of the other classes.

General Information

Attribute Value
Owner physical_information
Applied Stereotype
Base Classifier Unit
Is Abstract false
Derived Classifiers


Name Type Mult. Description Owning Classifier
exponent Integer 0..1

Defines the exponent with which this unit instance should be used. In order to define square meters for example, the SIUnit "metre" with an exponent of 2 will be used. If no exponent is defined it is equivalent to the value 1.

identification String 1

A unique identification of the custom unit.