| Interface | Description | 
|---|---|
| EventType<T> | 
 Marks all event types that can be received via dxFeed API. 
 | 
| IndexedEvent<T> | 
 Represents an indexed collection of up-to-date information about some
 condition or state of an external entity that updates in real-time. 
 | 
| LastingEvent<T> | 
 Represents up-to-date information about some
 condition or state of an external entity that updates in real-time. 
 | 
| TimeSeriesEvent<T> | 
 Represents time-series snapshots of some
 process that is evolving in time or actual events in some external system
 that have an associated time stamp and can be uniquely identified. 
 | 
| Class | Description | 
|---|---|
| IndexedEventSource | 
 Source identifier for  
IndexedEvent. | 
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