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        xmlDoc.Load(Server.MapPath("data.xml"));
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XmlNode root;//¸ù½Úµã
root = xmldoc.DocumentElement;//»ñÈ¡¸ù½Úµã
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 XmlNodeList nodeList = xmlDoc.SelectSingleNode("Employees").ChildNodes;//»ñÈ¡Employees½ÚµãµÄËùÓÐ×Ó½Úµã
        foreach (XmlNode xn in nodeList)//±éÀúËùÓÐ×Ó½Úµã
        {
            XmlElement xe = (XmlElement)xn;//½«×Ó½ÚµãÀàÐÍת»»ÎªXmlElementÀàÐÍ
            if (xe.GetAttribute("genre") == "ÕÅÈý")//Èç¹ûgenreÊôÐÔֵΪ“ÕÅÈý”
            {
                xe.SetAttribute("genre", "updateÕÅÈý");//ÔòÐ޸ĸÃÊôÐÔΪ“updateÕÅÈý”
                XmlNodeList nls = xe.ChildNodes;//¼ÌÐø»ñÈ¡xe×Ó½ÚµãµÄËùÓÐ×Ó½Úµã
                foreach (XmlNode xn1 in nls)//±éÀú
                {
                    XmlElement xe2 = (XmlElement)xn1;//ת»»ÀàÐÍ
                    if (xe2.Name == "author")//Èç¹ûÕÒµ½
                    {
              &nb


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<Product PID="XS000-3">
<Package Needuan="10"/>
<Package Needuan="8"/>
</Product>
</Bil>
 
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<title>Meerkat: An Open2 Wire Service</title>
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<LinkLibrary xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<Link Cat="aa" Url="aa" Desc="aa" />
<Link Cat="bb" Url="aa" Desc="aa" />
<Link Cat="cc" Url="aa" Desc="aa" />
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        {  
            XmlDocument xmlDoc = new XmlDocument();
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