using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Windows.Forms; using System.Xml; using System.Xml.Linq; using System.IO; public class MainClass{ public static void Main(string[] args){ XDocument NewDoc = new XDocument(new XDeclaration("1.0", "utf-8", "yes"), new XElement("Root", "MyDoc")); NewDoc.AddFirst(new XDocumentType( "MyDocType", "MyPubID", "MySysID", "ThisInternalSubset")); } }