using System;
using System.Linq;
using System.Collections;
using System.Collections.Generic;
using System.Xml;
using System.Xml.Linq;
public class MainClass {
public static void Main() {
XDocument xDocument = new XDocument(
new XElement("Books",
new XElement("Book",
new XAttribute("type", "Author"),
new XComment("This is a new author."),
new XElement("FirstName", "A"),
new XElement("LastName", "B")),
new XElement("Book",
new XAttribute("type", "Author"),
new XElement("FirstName", "C"),
new XElement("LastName", "D"))));
IEnumerable<XNode> nodes = xDocument.Element("Books").Elements("Book").Nodes().Reverse();
foreach (XNode node in nodes) {
Console.WriteLine("Source node: {0}", node);
}
foreach (XNode node in nodes.InDocumentOrder()) {
Console.WriteLine("Ordered node: {0}", node);
}
}
}
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