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() {
XmlElement xmlBook;
XmlAttribute xmlParticipantType;
XmlElement xmlFirstName;
XmlElement xmlLastName;
XmlDocument xmlDoc = new XmlDocument();
XmlElement xmlBooks = xmlDoc.CreateElement("Books");
xmlDoc.AppendChild(xmlBooks);
xmlBook = xmlDoc.CreateElement("Book");
xmlParticipantType = xmlDoc.CreateAttribute("type");
xmlParticipantType.InnerText = "Author";
xmlBook.Attributes.Append(xmlParticipantType);
xmlFirstName = xmlDoc.CreateElement("FirstName");
xmlFirstName.InnerText = "J";
xmlBook.AppendChild(xmlFirstName);
xmlLastName = xmlDoc.CreateElement("LastName");
xmlLastName.InnerText = "R";
xmlBook.AppendChild(xmlLastName);
xmlBooks.AppendChild(xmlBook);
xmlBook = xmlDoc.CreateElement("Book");
xmlParticipantType = xmlDoc.CreateAttribute("type");
xmlParticipantType.InnerText = "Author";
xmlBook.Attributes.Append(xmlParticipantType);
xmlFirstName = xmlDoc.CreateElement("FirstName");
xmlFirstName.InnerText = "E";
xmlBook.AppendChild(xmlFirstName);
xmlLastName = xmlDoc.CreateElement("LastName");
xmlLastName.InnerText = "B";
xmlBook.AppendChild(xmlLastName);
xmlBooks.AppendChild(xmlBook);
XmlNodeList authorsList = xmlDoc.SelectNodes("Books/Book[@type=\"Author\"]");
foreach (XmlNode node in authorsList) {
XmlNode firstName = node.SelectSingleNode("FirstName");
XmlNode lastName = node.SelectSingleNode("LastName");
Console.WriteLine("{0} {1}", firstName, lastName);
}
}
}