This type represents a B geometry CURVE.


A bcurve is a type of curve (PK_CLASS_bcurve is a subclass of PK_CLASS_curve).

The bcurve is defined by data contained in a PK_BCURVE_sf_t.
Piecewise and splinewise representations of bcurves are also available:
See PK_BCURVE_piecewise_sf_t and PK_BCURVE_splinewise_sf_t