GDnTReference

GDnTReference stores the reference element specification associated with a feature control frame. It records how elements are associated for tolerance evaluation (for example Chebyshev or Gaussian criteria, with or without external or internal constraint) and which parameter of the reference element is evaluated, such as the peak value or deviation span. By parsing the reference separately, the API enables precise reconstruction of how the feature must be evaluated during inspection, delivering the context necessary for tolerance analysis. Use this model to evaluate measurement strategies or confirm that supplier documentation applies the intended evaluation rules.

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class GDnTReference(BaseModel):
    """
    Represents a reference for a GD&T characteristic.
    """

    association: Optional[GDnTReferenceAssociation] = Field(
        None, description="Reference for associating elements in tolerance evaluation."
    )
    parameter: Optional[GDnTReferenceParameter] = Field(
        None,
        description="Parameter of the reference element (e.g., peak value, deviation span).",
    )