lse;
  if not FActive then exit;
  //关于xpath语法说明，参见 www.w3.org/TR/xpath
  xpath:=UsersTag+''[''+U_Id+''="''+userid+''"]'';
  xuser:=FXMLDoc.documentElement.selectSingleNode(xpath);
  if xuser<>nil then result:=true;
end;

initialization
  { Initialise COM }
  CoInitialize(nil);
finalization
  { Tidy up }
  CoUninitialize();

end.

调用上面单元的实例的代码，unit单元：

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls,XMLOptionUnit, OleCtrls, SHDocVw;

type
  TForm1 = class(TForm)
    Button1: TButton;
    Button2: TButton;
    Edit1: TEdit;
    Edit2: TEdit;
    Button3: TButton;
    Button4: TButton;
    Button5: TButton;
    WebBrowser1: TWebBrowser;
    Label1: TLabel;
    Button6: TButton;
    Button7: TButton;
    Button8: TButton;
    procedure FormCreate(Sender: TObject);
    procedure FormDestroy(Sender: TObject);
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
    procedure Button3Click(Sender: TObject);
    procedure Button4Click(Sender: TObject);
    procedure Button5Click(Sender: TObject);
    procedure Button6Click(Sender: TObject);
    procedure Button7Click(Sender: TObject);
    procedure Button8Click(Sender: TObject);
  private
    { Private declarations }
    FXMLOption:TXMLOption;
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.FormCreate(Sender: TObject);
begin
  FXMLOption:=TXMLOption.Create;
end;

procedure TForm1.FormDestroy(Sender: TObject);
begin
  FXMLOption.Free;
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
  FXMLOption.CreateBlank(edit1.Text);
end;

procedure TForm1.Button2Click(Sender: TObject);
var
  auser:RecUser;
begin
  auser.U_Id:=edit2.Text;
  auser.U_Name:=''tom'';
  auser.U_Sex:=''男'';
  auser.U_Birth:=''1979-8-7'';
  auser.U_Tel:=''1236547890'';
  auser.U_Addr:=''tom 大街 8 号'';
  auser.U_PostCode:=''100018'';
  auser.U_Email:=''tom@888.com'';
  FXMLOption.AppendUser(auser);
  WebBrowser1.Navigate(ExtractFilePath(application.ExeName)+edit1.Text);
end;

procedure TForm1.Button3Click(Sender: TObject);
begin
  FXMLOption.OpenXml(edit1.Text);
  WebBrowser1.Navigate(ExtractFilePath(application.ExeName)+edit1.Text