Among other things, it knows about its dimensionality and its relation to other coordinate systems. An axis descriptor must include a dimension type such as Length, Angle, Time, and Wavelength, and a unit type such as Radians or Feet. It may also contain an optional user-supplied name and an optional axis function.
Actual slot is inherited from graph node.
Allocates an axis-descriptor pointer array of length size . This can only be called from instantiable sub-classes. Returns the axis descriptor associated with the nth axis of this coordinate system. Causes this coordinate-transform to be disconnected from all other coordinate systems in the coordinate transform graph. All directly connected coordinate transforms are also removed.