Extent of the dataframe that contains the layer.
[Visual Basic 6.0] Property DataFrameExtent As IEnvelope
[Visual Basic .NET] Public ReadOnly Property DataFrameExtent As IEnvelope
[C#] public IEnvelope DataFrameExtent {get;}
[Java] public IEnvelope getDataFrameExtent() throws IOException, AutomationException
[C++] HRESULT get_DataFrameExtent( IEnvelope** ppExtent );