4.3 Standardized description of relative locations in space
The user wants to use a concrete type with defined mathematics to be interoperable with systems which make use of the same type.
This leads to the requirement:
Provision of a concrete VariableType which provides information for position in cartesian coordinates and orientation in angles (see 7.3 CartesianFrameAngleOrientationType)
Definition of standardized mathematical usage of position and orientation (see Annex B)