Lines and point format

While putting on of line trains and bases it is fixed whether it concerns two-dimensional or three-dimensional points. However, a structure with three co-ordinates is always stored away. One can question with line trains and points whether the co-ordinates are two-dimensional or three-dimensional. If it concerns two-dimensional co-ordinates, the z co-ordinate can contain an invalid value.

FORMAT_2D 0

The point, or the string contains co-ordinates which own no z co-ordinate, are two-dimensional so.

FORMAT_3D 1

The point, or the string contains three-dimensional co-ordinates.