Used by a Geometry Model Instance to specify a Variable (within the ordered Variable list of the Model's Interface Template) for which the Geometry Model Instance is supplying a value.
The value is specified by an Expression aggregated by the Geometry Model Instance that instances the Model; the Geometry Instance Template Index lies between the Geometry Model Instance and the Expression.
See Interface Template for examples.
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index into the <Variable> list of the <Interface Template> of the <Model> that the <Geometry Model Instance> is instancing