active duration instance = interval ?

Hello,

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Semantics of endsync and restart: 

In the case of an element that restarts (e.g. because of multiple begin times), the element is considered to have ended its active duration when one active duration instance has completed. It is not a requirement that all instances associated with multiple begin and end times complete, to satisfy the semantics of endsync. This means that if the element is playing a second or later instance of an active duration, it may be cut short by a parent, once the other children satisfy the endsync semantics. 
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Does
"active duration instance"

mean Interval ? (as defined in the timegraph model)

thanks,

--
Sigurd Lerstad