multiple begin/end times on <par>/<seq>/<excl>

Hello,

Just want to clarify some things...

Can <seq>/<par>/<excl>

have multiple begin/end times ?

If I understand correctly, time containers don't use the notion of active duration, they just use simple duration ? So they can't repeat either? (Having said that, maybe they can't have 'end' attribute either, since simple duration calculation doesn't use 'end' ?)

thanks,

--
Sigurd Lerstad