a set of three canonical Euler rotations, packed into a single Vec3, for conciseness and efficiency of reading. The \em first axis named is the most local, so a single rotateXYZ is equivalent to the ordered ops "rotateZ rotateY rotateX". See also note on rotation packing order.
orient - arbitrary axis/angle rotation, expressed as a quaternion
transform - 4x4 matrix transformation
resetXformStack - when appearing as the first op, instructs client that the transform stack should be cleared of any inherited transformation prior to processing the rest of the prims ops. It is an error for resetXformStack to appear anywhere other than as the first element in xformOpOrder.