animations and intervals

Hello,

Reading up on intervals and current interval etc. in the SMIL timing model.

Is it a good idea to keep a history of all the intervals created for an
animation element? I'm looking into seeking backwards, and
though the rules are not completely clear to me yet, is keeping a list of
already happened intervals a good idea (or even necessery) to
seek backwards? It is my understanding that this is not necessary when
playing normally and when seeking forwards.

As Thomas E Deweese said, it's a good thing to refer to the specs and saying
why I think the spec isn't clear when asking a question, however, all this
is very fuzzy at the moment, and I don't have a complete understanding of
the spec yet, I'm simply asking for implementation advise on wether keeping
a list of history intervals for the sake of seeking backwards is a good idea
or not, a simple yes or no from someone with implementation experience will
do, so I know I'm on the right track.

thanks,

--
Sigurd Lerstad