Accessing a nested field...

Hello,
i'm using TClientDataSet to read the data from a XML file.
I have a nested field and i need to access to its "subfields"... how can i do that through code?
I tried to read the help, it says something about using the TDatasetField class but i can't figure out how.
Let's say that i have something like this:


procedure Test;
var
 CDS: TClientDataSet;
begin
 CDS := TClientDataSet.Create(Self);  
 CDS.LoadFromFile('myfile.xml');      
 CDS.Active := True;                            
 if CDS.RecordCount > 0 then              
 begin  
  CDS.First;                                          
  //here i should read the subfields
  //of a nested field (let's call it
  //'mynestedfield')... how can i do this?
 end;
 CDS.Active := False;
 CDS.Free;
end;



Any suggestion is welcome.

Bye,
   Luca T.