| Interface | Description | 
|---|---|
| MessageProvider | API for message providers | 
| MessageService | Message Service API | 
| Class | Description | 
|---|---|
| Message | Holds the text and metadata for a message that will be given by the system, including validation
 messages, UI text (labels, instructions), and other text that has been externalized from the
 system | 
| MessageServiceImpl | Implementation of the  MessageServicethat allowsMessageProviderimplementations
 to be configured for exposing external message repositories | 
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