Note: There is a newer version of this specification see VEC 2.1.0

A precisely specified quantity in terms of which the magnitudes of other quantities of the same kind can be stated. The different systems to define units are represented by the subclasses of this class (e.g. SIUnit, ImperialUnit).

General Information

Attribute Value
Owner physical_information
Applied Stereotype constant
Base Classifier
Is Abstract true
Derived Classifiers CompositeUnit, CustomUnit, IECUnit, ImperialUnit, OtherUnit, SIUnit, USUnit


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.


Incoming Relations

Type Mult. Role Mult. Description
BuildingBlockSpecification2D 0..* baseUnit 1
BuildingBlockSpecification3D 0..* baseUnit 1
LocalGeometrySpecification baseUnit 1

The Unit in which all coordinates (e.g. cartesian points) are defined. Shall be a unit of length (e.g. millimetre).

CompositeUnit factors 1..*

References the Units that are used as factors to create the CompositeUnit.

VecContent 1 unit 0..* Specifies the Units used in the VEC-file.
ValueWithUnit 0..* unitComponent 1 References the unit of the value.
Dimension 0..* unitComponent 1