This part of ISO 10303 specifies the interpretation of the itegrated resources to satisfy the requirement
for the definition of a face with explicit topological bounds and fully defined geometry.
The following are within the scope of this part of ISO 10303:
3D geometry;
B-spline curves and surfaces;
conics;
elementary curves;
elementary surfaces;
polylines;
pcurves;
sculptured surfaces;
surface curves referencing pcurves;
swept surfaces;
twisted curves;
unbounded geometry;
geometric transformations;
use of topology to bound geometric entities.
The following are outside the scope of this part of ISO 10303:
2D geometry other than for the definition of a pcurve in the parameter space of a surface;
bounded curves other than polylines and B-spline curves;
bounded surfaces other than B-spline surfaces;
offset curves and surfaces.