Is iTunesTagging no longer support?

I'm currently trying to develope ipod control function on IVI for vehicle. From previous experience I remember we need to implement iTunetagging, but since I can't find it in Accessory Firmware Specification R46, I'm wondering whether iTunesTagging is no longer support.

Thanks in advance for you support!

Is iTunesTagging no longer support?
 
 
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