AnalogBalance Image Tag not properly read

[Jamy-L]

The DNG specification says:

Description
Normally the stored raw values are not white balanced, since any digital white balancing will reduce the
dynamic range of the final image if the user decides to later adjust the white balance; however, if camera
hardware is capable of white balancing the color channels before the signal is digitized, it can improve the
dynamic range of the final image.
AnalogBalance defines the gain, either analog (recommended) or digital (not recommended) that has been
applied the stored raw values. 

I have never seen a dng file that contains this tag, so I never bothered to implement a check when normalising the input (the program just reads AsShotNeutral to do the whitebalance). If you are in such case and would like a fix, please let me know. It would also help if you could provide a sample of a such dng.