SoLineSet(3) on Linux
The text faf5779e2144, as Debian 6.0 (Squeeze) shipped it.
The SoLineSet class is used to render and organize non-indexed polylines. Polylines are specified using the numVertices field. Coordinates, normals, materials and texture coordinates are fetched in order from the current state or from the vertexProperty node if set. For example, if numVertices is set to [3, 4, 2], this node would specify a line through coordinates 0, 1 and 2, a line through coordinates 3, 4, 5 and 6, and finally a single line segment between coordinates 7 and 8.