Códigos DXF       Descripción

100             Subclass marker (AcDbSpline)
210             DXF: X value of normal vector
                   Application: Normal vector
                  (omitted if the spline is nonplanar)
220,230         DXF only: Y and Z values of normal vector 
70              Spline flag (bit coded): 
                   1 = Closed spline,
                   2 = Periodic spline, 
                   4 = Rational spline, 
                   8 = Planar, 
                   16 = Linear; planar bit is also set 
71              Degree of the spline curve
72              Number of knots
73              Number of control points
74              Number of fit points (if any)
42              Fit tolerance (default = 0.0000001) 
43              Control-point tolerance (default = 0.0000001) 
44              Fit tolerance (if a fit spline) 
12              DXF: X value of start tangent
                     (may be omitted)(in WCS)
                  Application: Start tangent
22,32        DXF only: Y and Z values of start tangent 
                     (may be omitted)(in WCS)
13              DXF: X value of end tangent
                     (may be omitted)(in WCS)
                  Application: End tangent
23,33        DXF only: Y and Z values of end tangent
                      (may be omitted)(in WCS)
40              Knot value (one entry per knot) 
10              DXF: X value of control points (in WCS)
                     (one entry per control point)
                  Application: Control points
20,30        DXF only: Y and Z values of control points
                     (in WCS) (one entry per control point) 
41              Weight (if not 1); with multiple group pairs,
                     will be present if all are not 1
11              DXF: X value of fit points 
                     (in WCS) (one entry per fit point) 
                  Application: Fit points
21, 31       DXF only: Y and Z values of fit points
                     (in WCS) (one entry per fit point)