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(); XDocumentType documentType = new XDocumentType("Books", null, "Books.dtd", null); xDocument.Add(documentType, new XElement("Books")); Console.WriteLine(xDocument); } }