8
V. Liberatore
Pervasive Computing
Organization
of air travel: a different view
Layers: each layer implements a
service
nvia its own internal-layer actions
nrelying on services provided by layer below
ticket (purchase)
baggage (check)
gates
(load)
runway
takeoff
airplane routing
ticket (complain)
baggage (claim)
gates (unload)
runway landing
airplane routing
airplane routing