using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Xml;
using System.Xml.XPath;
public class MainClass
{
public static void Main()
{
XmlDocument doc;
XPathNavigator editor2;
XmlWriter writer;
doc = new XmlDocument();
doc.Load("pubs.xml");
foreach(XPathNavigator editor in doc.CreateNavigator().Select("/pubs/titles[authors/@au_lname='Green']"))
{
editor2 = editor.SelectSingleNode("authors[@au_lname!='Green']");
if (editor2!=null) editor2.DeleteSelf();
writer = editor.AppendChild();
writer.WriteStartElement("authors");
writer.WriteAttributeString("au_lname", "A");
writer.WriteAttributeString("au_fname", "B");
writer.Close();
}
doc.Save("output.xml");
}
}