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() {
XNamespace ns = "http://www.rntsoft.com/Books";
XElement xBookParticipant = new XElement(ns + "Book");
Console.WriteLine(xBookParticipant);
}
}