Need more explicit definition of how wscal::Sequnce is used to describe the EiEvent time periods (WD16 - 642)

There does not appear to be enough definiton of how the wscal:Sequnce is used to describe the different time periods associated with EiEvent. I think this issue goes beyond just adding a descriptiobn of wscal, but requires us to further identify the time periods such as "StartTime" and "EndTime" and show how wscal is used to represent them. For the overall EiEvent we need as a minimum:

Notification time
Start time
End time - note that some dispatches that may use EiEvent may be open ended with no edn time to this could be optional

Optinally we could add the various ramp times.

We also need to further show how a sequence of EventInfo instances are represented as a sequence witin the the Starttime - Endtime interval.