Binding Nested C Structs

[Craig Dillabaugh via Digitalmars-d-learn]

I am trying to bind to a C union with a number of nested structs 
declared as follows:

typedef union {
    int         Integer;
    struct {
        int     nCount;
        int     *paList;
    } IntegerList;

    struct {
        int     nCount;
        GIntBig *paList;
    } Integer64List;

} OGRField;

According to http://wiki.dlang.org/D_binding_for_C#Nested_Structs
I should attempt to write something like (last example shown):

extern(C) union OGRField
{
   int Integer;
   struct {
      int  nCount;
      int* paList;
   }

   struct {
      int      nCount;
      GIntBig* paList;
   }
}

But that is obviously not going to work.  Does anyone know the 
right way
to handle nested C structs of that form.