'nurl' <name(char9)|!> ['DEFINE' <pstart> <pend> -> <deg> <npnt> <nknt> <div>]| ['CONTROL' <index> <pnt> <weight>]| ['KNOT' <index> <value>]| ['END']This keyword is used to define a nurbs line. So far this command is only used to read a nurbs-line definition. This line will be converted automatically into a spline. Nurbs-lines can be displayed but will not be saved. CAD-interfaces might use this functionality.