The challend did state that the periods listed were arbitrary
(unkown). Any way to drive your solution without parameters or
pre-existing variables defining these periods?
I wondered what you meant by that - I still do. You mean you want the
stylesheet to detect a time at which no sessions are alive, and use that as
a boundary between periods? What if there is no such time? What if there are
several? You need to specify the problem more precisely.
Michael Kay
http://www.saxonica.com/
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