Maya SDK Getting total rotation from Rotation Anim Curves

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I am trying to convert a X,Y,Z rotation from the rotate anim curves to a local quaternion of a bone.

I've read that "Total Rotation = Pre Rotation * Rotation * Post Rotation

where Pre Rotation = Joint Orient,  and Post Rotation is Rotate Orient

How exactly out of Maya SDK do I get these  Pre and Post rotations?  -- What exactly are they?
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I have figured it out.

MFnIKJoint  has two functions   getOrientation()  -- Joint Orient, and getScaleOrientation()  -- Rotate Orient

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