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5.3. Model Extension Definition Registry (MED Registry)
A MED registry keeps track of all the MEDs that are registered in a workspace. Only registered MEDs can be used to extend a model. There are 2 different types of MEDs stored in the registry:
- Built-In MED - these are registered during Teiid Designer installation. These MEDs cannot be updated or unregistered by the user.
- User Defined MED - these are created by the user. These MEDs can be updated, registered, and unregistered by the user.
The MED Registry state is persisted and is restored each time a new session is started.
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