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rep 103 defines the co-ordinate frames and their orientatioins. If your IMU isn't mounted per this, you will have to correct for it in the urdf file to match the convention (recommended). This is so that your IMU readings can be compatible with everything ros. Defining the imu_link in your urdf should be enough. Ros/tf will take care of the transforms for you!

Of course you don't have to do it! If you don't care about compatibility (not recommended), you don't need to! You will have to ensure you are applying the correct gravitational forces and that you are reading the correct roll, pitch and yaw in your calculations.