using System;

using System.Xml;

using System.Xml.Serialization;

using System.IO;

using System.Linq;

using System.Collections;

using System.Collections.Generic;

using System.Xml.Linq;

using System.Data;

using System.Collections.Specialized;

using System.Text.RegularExpressions;

using System.Globalization;

using System.Diagnostics;

​

public class Program

{

    public static void Main()

    {

        string input = @"<?xml version=""1.0"" encoding=""UTF-8""?><!DOCTYPE KEA-publ PUBLIC ""-//KLI//DTD KEA-BASIC//EN"" ""keabasic.dtd"" [ 

<!ENTITY SLSD_158790_gif SYSTEM ""IEL-Environment-109-Taiwan_aw01.gif"" NDATA GIF>

<!ENTITY SLSD_158791_gif SYSTEM ""IEL-Environment-109-Taiwan_aw02.gif"" NDATA GIF>

<!ENTITY SLSD_158792_gif SYSTEM ""IEL-Environment-109-Taiwan_aw03.gif"" NDATA GIF>

<!ENTITY SLSD_158493_gif SYSTEM ""IEL-Environment-109-Taiwan_aw04.gif"" NDATA GIF>

<!ENTITY SLSD_158794_gif SYSTEM ""IEL-Environment-109-Taiwan_aw05.gif"" NDATA GIF>

<!ENTITY SLSD_158795_gif SYSTEM ""IEL-Environment-109-Taiwan_aw06.gif"" NDATA GIF>

<!ENTITY SLSD_158796_gif SYSTEM ""IEL-Environment-109-Taiwan_aw07.gif"" NDATA GIF>

<!ENTITY SLSD_158797_gif SYSTEM ""IEL-Environment-109-Taiwan_aw08.gif"" NDATA GIF>

<!ENTITY SLSD_158g98_gif SYSTEM ""IEL-Environment-109-Taiwan_aw09.gif"" NDATA GIF>

<!ENTITY SLSD_158499_gif SYSTEM ""IEL-Environment-109-Taiwan_aw10.gif"" NDATA GIF>

]> <root> </root>";

        XDocument doc = XDocument.Parse(input);     

        doc.Declaration.Dump();

        doc.DocumentType.InternalSubset.Dump();

    }

}

​

​

​

​