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| ArcObjects Help for .NET developers > ArcObjects namespaces > ArcMapUI > ESRI.ArcGIS.ArcMapUI > Classes > M > MosaicDatasetExtension CoClass (ArcObjects .NET 10.5 SDK) | 
The extension of the mosaic layer.
| Interfaces | Description | 
|---|---|
| IExtension (esriSystem) | Provides access to members that define an extension. |