derived element
A element that can be computed from other elements and is included for clarity or for design purposes even though it adds no semantic information.
See also constraint, dependency.
Semantics
A derived element is logically redundant within a model because it can be computed from one or more other elements. The formula for computing a derived element may be given as a constraint.
A derived element may be included in a model for several reasons. At the analysis level, a derived element is semantically unnecessary, but it may be used to provide a name or a definition for a meaningful concept, as a kind of macro. It is important to remember that a derived element adds nothing to the semantics of a model.
In a design-level model, a derived ...
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