Federated Databases
...
Wrapper
Local External
Schema
Export
Schema 1
Component
Schema 1
Conceptual
Schema 1
Internal
Schema 1
DB1
Component
System
DBS 1
Component
System n
Federation Service
Global (Federated)
Schema
Export
Schema n
Component
Schema n
Conceptual
Schema n
Structure
Description n
Global Application 1
...
Global External
Schema 1
Global External
Schema m
Global Application m
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