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The spatial reference.
[Visual Basic .NET] Public Property SpatialRef As ISpatialReference
[C#] public ISpatialReference SpatialRef {get; set;}
[C++]
HRESULT get_SpatialRef(
  ISpatialReference* ppSR
);
[C++]
HRESULT putref_SpatialRef(
  ISpatialReference** ppSR
);
[C++] Parameters ppSR [in]
ppSR is a parameter of type ISpatialReference* ppSR [out, retval]
ppSR is a parameter of type ISpatialReference**