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Good point iain.
It appears to me that workshop participants were expecting a DT to rely on data extracted from an existing real physical system; otherwise, no communication between a real physical system with its digital counter part (a key feature of a DT) would seem to exist.
For the airport evacuation example, prima facie, one can assume that the physical system has not even existed yet, as it states the simulation takes place during design phase. Nonetheless, what if the simulation is based on data extracted from other similar airports, or other existing and operating terminals within an similar context?