See: Description
| Class | Description | 
|---|---|
| YAnnouncement | A container of objects that represent an engine generated event for notification to
 observer gateways and services. | 
| Enum | Description | 
|---|---|
| AnnouncementContext | |
| YEngineEvent | An enum of the various event types that can be raised by the engine and passed to
 observer gateways and services | 
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