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procedure TForm1.Button1Click(Sender: TObject);
 var
 myFirstXML : IXMLDocument;
 i,j : Integer;
  f: TextFile;
  g: String;
begin
myFirstXML := newXMLDocument;
myFirstXML.LoadFromFile('D:/input_mainplan.xml');
AssignFile(f, 'C:/test.txt');
    Append(f);
    for i := 0 to myFirstXML.DocumentElement.ChildNodes.Count -1 do
     for j := 0 to myFirstXML.DocumentElement.ChildNodes[i].ChildNodes.Count -1 do
     Writeln(f, myFirstXML.DocumentElement.ChildNodes[i].ChildNodes[j].Attributes['KO_NAME']);
    Flush(f);
    CloseFile(f);
end;