Following is an example, which illustrates the problem to be addressed:

• A drive can support an arbitrary subset of possible control modes (e.g., Frequency Control, Position Control, Velocity Control, etc.). Each control mode requires a different subset of Variables to be implemented.
• At the same time, a drive can support several types of motors (e.g., induction motor, permanent magnet motor, etc.). Again, different types of motors require different subsets of variables to be implemented. Some of the variables are not applicable to certain types of motors, optional for some motor types, but required for other motor types. This criteria is orthogonal to the control mode, and trying to enumerate every possible combination of control mode and motor type would result in an impractical number of profiles.