Revit export ddXML?

Anyone:

Since Revit's duct pressure loss calculation tools are uneven at best, is there any chance that a well-connected duct system can be exported to ddXML, so that duct pressure loss calcs can be completed in Trane VariTrane Duct Designer?

This was possible with Autocad ABS 2006, so the coding to the schema has already been done within Autodesk - can this schema be translated to C# and made part of the Revti API?

Trane has a 16-page document for the schema that I have attached.

Any help is appreciated.

Thank you