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Reimplemented from StepGeom_Surface.
Reimplemented in StepGeom_BezierSurface, StepGeom_BezierSurfaceAndRationalBSplineSurface, StepGeom_BSplineSurface, StepGeom_BSplineSurfaceWithKnots, StepGeom_BSplineSurfaceWithKnotsAndRationalBSplineSurface, StepGeom_CurveBoundedSurface, StepGeom_QuasiUniformSurface, StepGeom_QuasiUniformSurfaceAndRationalBSplineSurface, StepGeom_RationalBSplineSurface, StepGeom_RectangularCompositeSurface, StepGeom_RectangularTrimmedSurface, StepGeom_UniformSurface, and StepGeom_UniformSurfaceAndRationalBSplineSurface. |