Baseline Quantity may need to be optional.
Some baseline calculations use a "day of" adjustment using the demand rate leading up to the event compared to "like days" . Those quantities may not be know to the VTN at the time of the event notification.
Also, the model contributed by the IRC does not contain any quantities, just time intervals to be included and time intervals to be excluded.
See also ENERGYINTEROP-496 and ENERGYINTEROP-498