This a simple question, but I can't understand an easy way to fix it.
SVG allows the animation to be built in back and forth. But using SVG UI, there seems to be only one direction animation possibility.
@thalesmaoa,
Yes you are correct that this is currently not possible with the ui node. But your stackoverflow discussion shows also another workaround for this problem, i.e. by chaining two animations. As soon as the first animation ends, another animation is started that reverts the first animation.
You can find a tutorial in the wiki about how to chain animations.
Bart