Required. Points to the index of the AnimationSampler.
REQUIRED. The index of the node to target (alternative target should be provided by extension). Extensions are not supported in this translation so this is required. This is the joint if you're wondering.
REQUIRED with standard values of ["translation", "rotation", "scale", "weights"]
Holds animation channels. Animations channels are the root of the animation in the model. An animation channel combines an animation sampler with a target property being animated.