There really aren't any xml functions :P
There's no way to use a type of delay command. There's no IF/THEN statements that we know how to use (that I know of), and things like dynamic data only seem to be used as attributes for otehr things, not as open expressions/variables that you can plop in the middle of a sentence.
As for the gradually part... I know you can set the fade rate in the settings I believe? This doesn't make it shrink, but... it is gradual :P
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