100

Subclass marker (AcDbPolyline)

90

Number of vertices.

70

Polyline flag (bit-coded); default is 0:
1 = closed
128 = plinegen

43

Constant width (optional; default = 0) Not used if variable width (codes 40 and/or 41) is set.

38

Elevation (optional; default = 0)

39

Thickness (optional; default = 0)

10

Vertex coordinates (in OCS), multiple entries; one entry for each vertex. DXF: X value; APP: 2D point

20

DXF: Y value of vertex coordinates (in OCS), multiple entries; one entry for each vertex

40

Starting width (multiple entries; one entry for each vertex) (optional; default = 0; multiple entries). Not used if constant width (code 43) is set.

41

End width (multiple entries; one entry for each vertex) (optional; default = 0; multiple entries). Not used if constant width (code 43) is set.

42

Bulge (multiple entries; one entry for each vertex)  (optional; default = 0).

210

Extrusion direction. (optional; default = 0, 0, 1).
DXF: X value; APP: 3D vector

220, 230

DXF: Y and Z values of extrusion direction