Yes there is. It does require that you sign a NDA to obtain it though. If your interested in getting that documentation please open up a service request and we will help you out right away.
I have opened 3-839470541 for this.
I can see the Service Request, it's still with Tier 1. They have correctly requested you provide them with proof of the NDA. Once they get that, they can provide the Schema to you.
Thanks for opening the SR - we need that for tracking purposes.
Have a great day!