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Primary display field.
[Visual Basic .NET]
Public ReadOnly Property DisplayField As String
[C#]
public string DisplayField {get;}
[C++]
HRESULT get_DisplayField(
System.String* FieldName
);
[C++] Parameters FieldName [out, retval]
FieldName is a parameter of type BSTR*
When DisplayExpression is used in the source map document, MapServer returns the first field used in the expression.