A spline is an entity that represents a non-uniform rational B-spline (NURBS) curve.

For more details, see the following topics:

Overview of Splines

Specific Properties of Splines

Computed Properties of Splines

Working with NURBS Data

Working with Fit Data

Example of Working with Splines

Sample project of working with splines is located in the Drawing\Examples\DevGuide\OdSplinesEx subdirectory of the ODA installation folder (for example, C:\Program Files\Open Design Alliance).