Swf's, if you know how to use it, can be very effective for your xml codes. by using it you can create characters that you have seen or heard of, while it may seem complicated at first it soon grows easier and easier
But sometimes your swf's can cause the animation to move faster than necsarcary while you are not moving. the reason this is is because when you go further down your xml you will see the actions like "movingLeft" or "idleRight" and it will most likely be the wrong action in the wrong place.
For iso characters if it says "idle" for when you are not moving you can change it to "idleRight" or "idleLeft" this has helped me on many occasions and is very effective for your gameplay experience.