A CircularArc is a geometric object defined by LIF (MLP 3.0) which is defined by two arcs (r[1] > r[2]), and two lines that radiate from the center point, at a given start angle and end angle. As with the definitions for circle and ellipse, this object is defined by its parameters: a center point, two radii, and two angles. This represenation can be used only in 2D. This is Modeled after GML ArcByCenterPointType. The radius of the inner arc. The radius of the outer arc. The bearing of the arc and radial line at the start. The bearing of the arc and radial line at the end. The attribute "interpolation" specifies the curve interpolation mechanism used for this segment. This mechanism uses the control points and control parameters to determine the position of this curve segment. For an ArcByCenterPoint the interpolation is fixed as "circularArcCenterPointWithRadius". Since this type describes always a single arc, the attribute is fixed to "1".