delphi 导出xml文件

procedure TfrmTallageDetail.ToolButton1Click(Sender: TObject);
var
  Xml:   TXMLDocument;
  Rootbusiness,Rootgroup,Rootdata : IXMLNode;
  business,group,data: IXMLNode;
begin
//加入版本信息 ‘<?xml version="1.0" encoding="GBK" ?> ’
    Xml.Active := True;
    Xml.Version := '1.0';
    Xml.Encoding :='GBK';
    Rootbusiness := Xml.CreateNode('business');
    Xml.DocumentElement := Rootbusiness;
    Rootbusiness.SetAttribute('id','FP56');
    Rootbusiness.SetAttribute('comment','外部发票报送');
    Rootgroup := Xml.CreateNode('group');
    Rootbusiness.ChildNodes.Add(Rootgroup);
    Rootdata := Xml.CreateNode('data');
    Rootdata.SetAttribute('nsrsbh','纳税人识别号');
    Rootdata.SetAttribute('wdbh','网点编号');
    Rootgroup.ChildNodes.Add(Rootdata);
   //单张发票信息
    business := Xml.CreateNode('business');
    business.SetAttribute('id','FPMX.DZFP');
    business.SetAttribute('comment','单张发票信息');
    Rootgroup.ChildNodes.Add(business);
 Xml.SaveToFile('aaa.xml');
    xml.Active := False;
    showmessage('创建成功！');
  finally
    Xml.Free;
  end;

上面是delphi自定义xml的简单例子。