public class XmlDocumentType : XmlLinkedNode {
// Protected Constructors
   protected internal XmlDocumentType( string name, string publicId, string systemId, string internalSubset, XmlDocument doc);  
// Public Instance Properties
   public XmlNamedNodeMap Entities{get; } 
   public string InternalSubset{get; } 
   public override bool IsReadOnly{get; }                             // overrides XmlNode
   public override string LocalName{get; }                            // overrides XmlNode
   public override string Name{get; }                                 // overrides XmlNode
   public override XmlNodeType NodeType{get; }                        // overrides XmlNode
   public XmlNamedNodeMap Notations{get; } 
   public string PublicId{get; } 
   public string SystemId{get; } 
// Public Instance Methods
   public override XmlNode CloneNode( bool deep);                     // overrides XmlNode
   public override void WriteContentTo( XmlWriter w);                 // overrides XmlNode
   public override void WriteTo( XmlWriter w);                        // overrides XmlNode
}