Topic: Defining Format
Considering the DVD-Video spec is part of the Xbox spec, these should be Xbox no? The Xbox playable attribute exists outside of the DVD-Spec as an additional format change. Kind of like how PlayStation 1 games could have Audio Tracks making them Audio CDs, but the unique additional playable aspect is what designates the format. The data track is "additional" to CD Audio aspect of PSX discs, the Xbox playable attribute is "additional" to the DVD-Video aspect of Xbox discs.