[lieandswell]

If you wanted to use the Blizzard animation API in XML, you could do something like:

<Frame>
    ... 
    <Animations>
        <AnimationGroup name="$parentPulse" parentKey="pulse" looping="BOUNCE">
	    <Alpha change="-1" duration="1.5"/>
        </AnimationGroup>
    </Animations>
    <Scripts>
        <OnLoad>
            self.pulse:Play();
        </OnLoad>
    </Scripts>
</Frame>