2003-01-21 Atsushi Enomoto <ginga@kit.hi-ho.ne.jp>
[mono.git] / mcs / class / System.XML / System.Xml / XmlDocument.cs
index e73e079402033570365f67a8b0c17ae75622903b..e54a1ed4dcc9111d7104a74683a9c7453010063a 100644 (file)
@@ -1,30 +1,65 @@
-// -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*-
 //
 // System.Xml.XmlDocument
 //
-// Author:
+// Authors:
 //   Daniel Weber (daniel-weber@austin.rr.com)
+//   Kral Ferch <kral_ferch@hotmail.com>
+//   Jason Diamond <jason@injektilo.org>
+//   Miguel de Icaza (miguel@ximian.com)
+//   Duncan Mak (duncan@ximian.com)
+//   Atsushi Enomoto (ginga@kit.hi-ho.ne.jp)
 //
 // (C) 2001 Daniel Weber
+// (C) 2002 Kral Ferch, Jason Diamond, Miguel de Icaza, Duncan Mak,
+//   Atsushi Enomoto
+//
 
 using System;
 using System.IO;
+using System.Text;
+using System.Xml.XPath;
+using System.Diagnostics;
+using System.Collections;
 
 namespace System.Xml
 {
-
-       public delegate void XmlNodeChangedEventHandler (XmlNodeChangedEventArgs args);
-
-       /// <summary>
-       /// Abstract class XmlNodeList.
-       /// </summary>
        public class XmlDocument : XmlNode
        {
-               // Private data members
-               XmlResolver _resolver = null;
+               #region Fields
+
+               XmlLinkedNode lastLinkedChild;
+               XmlNameTable nameTable;
+               string baseURI = String.Empty;
+               XmlImplementation implementation;
+               bool preserveWhitespace = false;
+               WeakReference reusableXmlTextReader;
+
+               #endregion
+
+               #region Constructors
+
+               public XmlDocument () : this (null, null)
+               {
+               }
+
+               protected internal XmlDocument (XmlImplementation imp) : this (imp, null)
+               {
+               }
+
+               public XmlDocument (XmlNameTable nt) : this (null, nt)
+               {
+               }
+
+               XmlDocument (XmlImplementation impl, XmlNameTable nt) : base (null)
+               {
+                       implementation = (impl != null) ? impl : new XmlImplementation ();
+                       nameTable = (nt != null) ? nt : implementation.internalNameTable;
+                       AddDefaultNameTableKeys ();
+               }
+               #endregion
+
+               #region Events
 
-               // Public events
-               //===========================================================================
                public event XmlNodeChangedEventHandler NodeChanged;
 
                public event XmlNodeChangedEventHandler NodeChanging;
@@ -37,29 +72,31 @@ namespace System.Xml
 
                public event XmlNodeChangedEventHandler NodeRemoving;
 
-               // public properties
+               #endregion
 
-               /// <summary>
-               /// Get the base URI for this document (the location from where the document was loaded)
-               /// </summary>
-               /// <example>If a document was loaded with doc.Load("c:\tmp\mydoc.xml"),
-               /// then BaseURI would hold "c:\tmp\mydoc.xml"</example>
-               public override string BaseURI
-               {
-                       get
-                       {
-                               // TODO - implement XmlDocument.BaseURI {get;}
-                               throw new NotImplementedException("BaseURI.get not implemented");
+               #region Properties
+
+               public override string BaseURI {
+                       get {
+                               return baseURI;
                        }
                }
 
-               /// <summary>
-               /// Get the root element for the document.  If no root exists, null is returned.
-               /// </summary>
-               public XmlElement DocumentElement
-               {
-                       get
-                       {
+               // Used to read 'InnerXml's for its descendants at any place.
+               internal XmlTextReader ReusableReader {
+                       get {
+                               if(reusableXmlTextReader == null)
+                                       reusableXmlTextReader = new WeakReference (null);
+                               if(!reusableXmlTextReader.IsAlive) {
+                                       XmlTextReader reader = new XmlTextReader ((TextReader)null);
+                                       reusableXmlTextReader.Target = reader;
+                               }
+                               return (XmlTextReader)reusableXmlTextReader.Target;
+                       }
+               }
+
+               public XmlElement DocumentElement {
+                       get {
                                XmlNode node = FirstChild;
 
                                while (node != null) {
@@ -72,440 +109,783 @@ namespace System.Xml
                        }
                }
 
-               /// <summary>
-               /// Gets the node containing the DOCTYPE declaration.
-               /// </summary>
-               public virtual XmlDocumentType DocumentType
-               {
-                       get
-                       {
-                               // TODO - implement XmlDocument.DocumentType
-                               throw new NotImplementedException("XmlDocument.DocumentType not implemented");
+               [MonoTODO("It doesn't have internal subset object model.")]
+               public virtual XmlDocumentType DocumentType {
+                       get {
+                               foreach(XmlNode n in this.ChildNodes) {
+                                       if(n.NodeType == XmlNodeType.DocumentType)
+                                               return (XmlDocumentType)n;
+                               }
+                               return null;
                        }
                }
 
+               public XmlImplementation Implementation {
+                       get { return implementation; }
+               }
 
-               /// <summary>
-               /// Get the XmlImplemenation for the current document.
-               /// </summary>
-               public XmlImplementation Implementation
-               {
-                       get
-                       {
-                               // TODO - implement XmlDocument.Implementation
-                               throw new NotImplementedException("Implementation not implemented");
+               public override string InnerXml {
+                       get {
+                               return base.InnerXml;
+                       }
+                       set {   // reason for overriding
+                               this.LoadXml (value);
                        }
                }
 
+               public override bool IsReadOnly {
+                       get { return false; }
+               }
 
-               /// <summary>
-               /// Get/Set the markup representing the children of the document.
-               /// </summary>
-               public override string InnerXml
-               {
-                       get
-                       {
-                               // TODO - implement XmlDocument.InnerXml {get;}
-                               throw new NotImplementedException("InnerXml get not implemented");
+               internal override XmlLinkedNode LastLinkedChild {
+                       get     {
+                               return lastLinkedChild;
                        }
-                       set
-                       {
-                               // TODO - implement XmlDocument.InnerXml {set;}
-                               throw new NotImplementedException("InnerXml set not implemented");
+
+                       set {
+                               lastLinkedChild = value;
                        }
                }
+               
+               public override string LocalName {
+                       get { return "#document"; }
+               }
 
-               /// <summary>
-               /// Get a value indicating if the document is read-only.
-               /// </summary>
-               public override bool IsReadOnly
-               {
-                       get
-                       {
-                               return false;
-                       }
+               public override string Name {
+                       get { return "#document"; }
                }
 
-               /// <summary>
-               /// Get the local name of the node.  For documents, returns "#document"
-               /// </summary>
-               public override string LocalName {
-                       get
-                       {
-                               return "#document";
-                       }
+               public XmlNameTable NameTable {
+                       get { return nameTable; }
                }
 
-               /// <summary>
-               /// Get the qualified name of the node.  For documents, returns "#document"
-               /// </summary>
-               public override string Name
-               {
-                       get
-                       {
-                               return "#document";
-                       }
+               public override XmlNodeType NodeType {
+                       get { return XmlNodeType.Document; }
                }
 
-               public XmlNameTable NameTable
-               {
-                       get
-                       {
-                               // TODO - implement XmlDocument.NameTable {get;}
-                               throw new NotImplementedException("NameTable get not implemented");
+               internal override XPathNodeType XPathNodeType {
+                       get {
+                               return XPathNodeType.Root;
                        }
                }
 
+               public override XmlDocument OwnerDocument {
+                       get { return null; }
+               }
 
-               public override XmlNodeType NodeType
-               {
-                       get
-                       {
-                               return XmlNodeType.Document;
-                       }
+               public bool PreserveWhitespace {
+                       get { return preserveWhitespace; }
+                       set { preserveWhitespace = value; }
                }
 
-               /// <summary>
-               /// Returns OwnerDocument.  For an XmlDocument, this property is always null.
-               /// </summary>
-               public override XmlDocument OwnerDocument
-               {
-                       get
-                       {
-                               return null;
-                       }
+               internal override string XmlLang {
+                       get { return String.Empty; }
                }
 
-               public bool PreserveWhitespace
-               {
-                       get
-                       {
-                               // TODO - implement XmlDocument.PreserveWhitespace {get;}
-                               throw new NotImplementedException("PreserveWhitespace get not implemented");
-                       }
-                       set
-                       {
-                               // TODO - implement XmlDocument.PreserveWhitespace {set;}
-                               throw new NotImplementedException("PreserveWhitespace set not implemented");
+               [MonoTODO]
+               public virtual XmlResolver XmlResolver {
+                       set { throw new NotImplementedException (); }
+               }
+
+               internal override XmlSpace XmlSpace {
+                       get {
+                               return XmlSpace.None;
                        }
                }
 
-               public XmlResolver XmlResolver
+               #endregion
+
+               #region Methods
+
+               [MonoTODO("Should BaseURI be cloned?")]
+               public override XmlNode CloneNode (bool deep)
                {
-                       set
+                       XmlDocument doc = implementation.CreateDocument ();
+                       doc.PreserveWhitespace = PreserveWhitespace;    // required?
+                       if(deep)
                        {
-                               // TODO - Finish/test XmlDocument.XmlResolver {set;}
-                               _resolver = value;
+                               foreach(XmlNode n in ChildNodes)
+                                       doc.AppendChild (doc.ImportNode (n, deep));
                        }
+                       return doc;
                }
 
-               // Public Methods
-               //===========================================================================
-               public override XmlNode CloneNode(bool deep)
+               public XmlAttribute CreateAttribute (string name)
                {
-                       // TODO - implement XmlDocument.CloneNode(bool)
-                       throw new NotImplementedException("CloneNode(bool) not implemented");
+                       return CreateAttribute (name, String.Empty);
                }
 
-               public XmlAttribute CreateAttribute(string name)
+               public XmlAttribute CreateAttribute (string qualifiedName, string namespaceURI)
                {
-                       // TODO - implement XmlDocument.CreateAttribute(string name)
-                       throw new NotImplementedException("CreateAttribute(string name) not implemented");
+                       string prefix;
+                       string localName;
+
+                       ParseName (qualifiedName, out prefix, out localName);
+
+                       return CreateAttribute (prefix, localName, namespaceURI);
                }
 
-               public XmlAttribute CreateAttribute(string qualifiedName,string namespaceURI)
+               public virtual XmlAttribute CreateAttribute (string prefix, string localName, string namespaceURI)
                {
-                       // TODO - implement XmlDocument.CreateAttribute(string, string)
-                       throw new NotImplementedException("CreateAttribute(string, string) not implemented");
+                       if ((localName == null) || (localName == String.Empty))
+                               throw new ArgumentException ("The attribute local name cannot be empty.");
+
+                       return new XmlAttribute (prefix, localName, namespaceURI, this);
                }
 
-               public virtual XmlAttribute CreateAttribute(
-                       string prefix,
-                       string localName,
-                       string namespaceURI
-                       )
+               public virtual XmlCDataSection CreateCDataSection (string data)
                {
-                       // TODO - implement XmlDocument.CreateAttribute(prefix, localName, namespaceURI)
-                       throw new NotImplementedException("CreateAttribute(prefix, localName, namespaceURI) not implemented");
+                       return new XmlCDataSection (data, this);
                }
 
-               public virtual XmlCDataSection CreateCDataSection(string data)
+               public virtual XmlComment CreateComment (string data)
                {
-                       // TODO - implement XmlDocument.CreateCDataSection(string data)
-                       throw new NotImplementedException("CreateCDataSection(string data) not implemented");
+                       return new XmlComment (data, this);
                }
 
-
-               public virtual XmlComment CreateComment(string data)
+               [MonoTODO]
+               protected internal virtual XmlAttribute CreateDefaultAttribute (string prefix, string localName, string namespaceURI)
                {
-                       // TODO - implement XmlDocument.CreateComment(string data)
-                       throw new NotImplementedException("CreateComment(string data) not implemented");
+                       throw new NotImplementedException ();
                }
 
-               public virtual XmlDocumentFragment CreateDocumentFragment()
+               public virtual XmlDocumentFragment CreateDocumentFragment ()
                {
-                       // TODO - implement XmlDocument.CreateDocumentFragment
-                       throw new NotImplementedException("CreateDocumentFragment not implemented");
+                       return new XmlDocumentFragment (this);
                }
 
-               public virtual XmlDocumentType CreateDocumentType(
-                       string name,
-                       string publicId,
-                       string systemId,
-                       string internalSubset
-                       )
+               public virtual XmlDocumentType CreateDocumentType (string name, string publicId,
+                                                                  string systemId, string internalSubset)
                {
-                       // TODO - implement XmlDocument.CreateDocumentType
-                       throw new NotImplementedException("CreateDocumentType not implemented");
+                       return new XmlDocumentType (name, publicId, systemId, internalSubset, this);
                }
 
-               public XmlElement CreateElement(string name)
+               public XmlElement CreateElement (string name)
                {
-                       // TODO - implement XmlDocument.CreateElement(string name)
-                       throw new NotImplementedException("CreateElement(string name) not implemented");
+                       return CreateElement (name, String.Empty);
                }
 
-               public XmlElement CreateElement(
-                       string qualifiedName,
-                       string namespaceURI
-                       )
+               public XmlElement CreateElement (
+                       string qualifiedName, 
+                       string namespaceURI)
                {
-                       // TODO - implement XmlDocument.CreateElement(string qualifiedName,     string namespaceURI)
-                       throw new NotImplementedException("CreateElement(string qualifiedName,  string namespaceURI) not implemented");
+                       string prefix;
+                       string localName;
+
+                       ParseName (qualifiedName, out prefix, out localName);
+                       
+                       return CreateElement (prefix, localName, namespaceURI);
                }
 
-               public virtual XmlElement CreateElement(
+               public virtual XmlElement CreateElement (
                        string prefix,
                        string localName,
-                       string namespaceURI
-                       )
+                       string namespaceURI)
                {
-                       return new XmlElement(prefix, localName, namespaceURI, this);
+                       if ((localName == null) || (localName == String.Empty))
+                               throw new ArgumentException ("The local name for elements or attributes cannot be null or an empty string.");
+                       CheckName (localName);
+                       return new XmlElement (prefix != null ? prefix : String.Empty, localName, namespaceURI != null ? namespaceURI : String.Empty, this);
                }
 
+               public virtual XmlEntityReference CreateEntityReference (string name)
+               {
+                       return new XmlEntityReference (name, this);
+               }
 
-               public virtual XmlEntityReference CreateEntityReference(string name)
+               [MonoTODO]
+               internal protected virtual XPathNavigator CreateNavigator (XmlNode node)
                {
-                       // TODO - implement XmlDocument.CreateEntityReference
-                       throw new NotImplementedException("XmlDocument.CreateEntityReference not implemented.");
+                       throw new NotImplementedException ();
                }
 
-               public virtual XmlNode CreateNode(
+               public virtual XmlNode CreateNode (
                        string nodeTypeString,
                        string name,
-                       string namespaceURI
-                       )
+                       string namespaceURI)
                {
-                       // TODO - implement XmlDocument.CreateNode(string, string, string)
-                       throw new NotImplementedException("XmlDocument.CreateNode not implemented.");
+                       return CreateNode (GetNodeTypeFromString (nodeTypeString), name, namespaceURI);
                }
 
-               public virtual XmlNode CreateNode(
+               public virtual XmlNode CreateNode (
                        XmlNodeType type,
                        string name,
-                       string namespaceURI
-                       )
+                       string namespaceURI)
                {
-                       // TODO - implement XmlDocument.CreateNode(XmlNodeType, string, string)
-                       throw new NotImplementedException("XmlDocument.CreateNode not implemented.");
+                       string prefix = null;
+                       string localName = name;
+
+                       if ((type == XmlNodeType.Attribute) || (type == XmlNodeType.Element) || (type == XmlNodeType.EntityReference))
+                               ParseName (name, out prefix, out localName);
+                       
+                       return CreateNode (type, prefix, localName, namespaceURI);
                }
 
-               public virtual XmlNode CreateNode(
+               public virtual XmlNode CreateNode (
                        XmlNodeType type,
                        string prefix,
                        string name,
-                       string namespaceURI
-                       )
-               {
-                       // TODO - implement XmlDocument.CreateNode(XmlNodeType, string, string, string)
-                       throw new NotImplementedException("XmlDocument.CreateNode not implemented.");
+                       string namespaceURI)
+               {
+                       switch (type) {
+                               case XmlNodeType.Attribute: return CreateAttribute (prefix, name, namespaceURI);
+                               case XmlNodeType.CDATA: return CreateCDataSection (null);
+                               case XmlNodeType.Comment: return CreateComment (null);
+                               case XmlNodeType.Document: return new XmlDocument (); // TODO - test to see which constructor to use, i.e. use existing NameTable or not.
+                               case XmlNodeType.DocumentFragment: return CreateDocumentFragment ();
+                               case XmlNodeType.DocumentType: return CreateDocumentType (null, null, null, null);
+                               case XmlNodeType.Element: return CreateElement (prefix, name, namespaceURI);
+                               case XmlNodeType.EntityReference: return CreateEntityReference (null);
+                               case XmlNodeType.ProcessingInstruction: return CreateProcessingInstruction (null, null);
+                               case XmlNodeType.SignificantWhitespace: return CreateSignificantWhitespace (String.Empty);
+                               case XmlNodeType.Text: return CreateTextNode (null);
+                               case XmlNodeType.Whitespace: return CreateWhitespace (String.Empty);
+                               case XmlNodeType.XmlDeclaration: return CreateXmlDeclaration ("1.0", null, null);
+                               default: throw new ArgumentOutOfRangeException(String.Format("{0}\nParameter name: {1}",
+                                                        "Specified argument was out of the range of valid values", type.ToString ()));
+                       }
                }
 
-               public virtual XmlProcessingInstruction CreateProcessingInstruction(
+               public virtual XmlProcessingInstruction CreateProcessingInstruction (
                        string target,
-                       string data
-                       )
+                       string data)
                {
-                       // TODO - implement XmlDocument.CreateProcessingInstruction
-                       throw new NotImplementedException("XmlDocument.CreateProcessingInstruction not implemented.");
+                       return new XmlProcessingInstruction (target, data, this);
                }
 
-               public virtual XmlSignificantWhitespace CreateSignificantWhitespace(string text )
+               public virtual XmlSignificantWhitespace CreateSignificantWhitespace (string text)
                {
-                       // TODO - implement XmlDocument.CreateSignificantWhitespace
-                       throw new NotImplementedException("XmlDocument.CreateSignificantWhitespace not implemented.");
+                       foreach (char c in text)
+                               if ((c != ' ') && (c != '\r') && (c != '\n') && (c != '\t'))
+                                   throw new ArgumentException ("Invalid whitespace characters.");
+                        
+                       return new XmlSignificantWhitespace (text, this);
                }
 
-               public virtual XmlText CreateTextNode(string text)
+               public virtual XmlText CreateTextNode (string text)
                {
-                       // TODO - implement XmlDocument.CreateTextNode
-                       throw new NotImplementedException("XmlDocument.CreateTextNode not implemented.");
+                       return new XmlText (text, this);
                }
 
-               public virtual XmlWhitespace CreateWhitespace(string text)
+               public virtual XmlWhitespace CreateWhitespace (string text)
                {
-                       // TODO - implement XmlDocument.CreateWhitespace
-                       throw new NotImplementedException("XmlDocument.CreateWhitespace not implemented.");
+                       foreach (char c in text)
+                               if ((c != ' ') && (c != '\r') && (c != '\n') && (c != '\t'))
+                                   throw new ArgumentException ("Invalid whitespace characters.");
+                        
+                       return new XmlWhitespace (text, this);
                }
 
-               public virtual XmlDeclaration CreateXmlDeclaration(
-                       string version,
-                       string encoding,
-                       string standalone
-                       )
+               public virtual XmlDeclaration CreateXmlDeclaration (string version, string encoding,
+                                                                   string standalone)
                {
-                       // TODO - implement XmlDocument.CreateXmlDeclaration
-                       throw new NotImplementedException("XmlDocument.CreateXmlDeclaration not implemented.");
-               }
+                       if (version != "1.0")
+                               throw new ArgumentException ("version string is not correct.");
 
-               public virtual XmlElement GetElementById(string elementId)
-               {
-                       // TODO - implement XmlDocument.GetElementById
-                       throw new NotImplementedException("XmlDocument.GetElementById not implemented.");
-               }
+                       if  ((standalone != null && standalone != String.Empty) && !((standalone == "yes") || (standalone == "no")))
+                               throw new ArgumentException ("standalone string is not correct.");
 
-               public virtual XmlNodeList GetElementsByTagName(string name)
-               {
-                       // TODO - implement XmlDocument.GetElementsByTagName(name)
-                       throw new NotImplementedException("XmlDocument.GetElementsByTagName not implemented.");
+                       return new XmlDeclaration (version, encoding, standalone, this);
                }
 
-               public virtual XmlNodeList GetElementsByTagName(
-                       string localName,
-                       string namespaceURI
-                       )
+               [MonoTODO]
+               public virtual XmlElement GetElementById (string elementId)
                {
-                       // TODO - implement XmlDocument.GetElementsByTagName(localName, namespaceURI)
-                       throw new NotImplementedException("XmlDocument.GetElementsByTagName not implemented.");
+                       throw new NotImplementedException ();
                }
 
-               public virtual XmlNode ImportNode(
-                       XmlNode node,
-                       bool deep
-                       )
+               public virtual XmlNodeList GetElementsByTagName (string name)
                {
-                       // TODO - implement XmlDocument.ImportNode
-                       throw new NotImplementedException("XmlDocument.ImportNode not implemented.");
+                       ArrayList nodeArrayList = new ArrayList ();
+                       this.searchNodesRecursively (this, name, nodeArrayList);
+                       return new XmlNodeArrayList (nodeArrayList);
                }
 
-               public virtual void Load(Stream inStream)
+               private void searchNodesRecursively (XmlNode argNode, string argName, 
+                       ArrayList argArrayList)
                {
-                       // TODO - implement XmlDocument.Load(Stream)
-                       throw new NotImplementedException("XmlDocument.Load(Stream) not implemented.");
+                       XmlNodeList xmlNodeList = argNode.ChildNodes;
+                       foreach (XmlNode node in xmlNodeList){
+                               if (node.Name.Equals (argName))
+                                       argArrayList.Add (node);
+                               else    
+                                       this.searchNodesRecursively (node, argName, argArrayList);
+                       }
                }
 
-               public virtual void Load(string filename)
+               private void searchNodesRecursively (XmlNode argNode, string argName, string argNamespaceURI, 
+                       ArrayList argArrayList)
                {
-                       // TODO - implement XmlDocument.Load(string)
-                       throw new NotImplementedException("XmlDocument.Load(string) not implemented.");
+                       XmlNodeList xmlNodeList = argNode.ChildNodes;
+                       foreach (XmlNode node in xmlNodeList){
+                               if (node.LocalName.Equals (argName) && node.NamespaceURI.Equals (argNamespaceURI))
+                                       argArrayList.Add (node);
+                               else    
+                                       this.searchNodesRecursively (node, argName, argNamespaceURI, argArrayList);
+                       }
                }
 
-               public virtual void Load(TextReader txtReader)
+               public virtual XmlNodeList GetElementsByTagName (string localName, string namespaceURI)
                {
-                       // TODO - implement XmlDocument.Load(TextReader)
-                       throw new NotImplementedException("XmlDocument.Load(TextReader) not implemented.");
+                       ArrayList nodeArrayList = new ArrayList ();
+                       this.searchNodesRecursively (this, localName, namespaceURI, nodeArrayList);
+                       return new XmlNodeArrayList (nodeArrayList);
                }
 
-               public virtual void Load(XmlReader reader)
+               private XmlNodeType GetNodeTypeFromString (string nodeTypeString)
                {
-                       // TODO - implement XmlDocument.Load(XmlReader)
-                       throw new NotImplementedException("XmlDocument.Load(XmlReader) not implemented.");
+                       switch (nodeTypeString) {
+                               case "attribute": return XmlNodeType.Attribute;
+                               case "cdatasection": return XmlNodeType.CDATA;
+                               case "comment": return XmlNodeType.Comment;
+                               case "document": return XmlNodeType.Document;
+                               case "documentfragment": return XmlNodeType.DocumentFragment;
+                               case "documenttype": return XmlNodeType.DocumentType;
+                               case "element": return XmlNodeType.Element;
+                               case "entityreference": return XmlNodeType.EntityReference;
+                               case "processinginstruction": return XmlNodeType.ProcessingInstruction;
+                               case "significantwhitespace": return XmlNodeType.SignificantWhitespace;
+                               case "text": return XmlNodeType.Text;
+                               case "whitespace": return XmlNodeType.Whitespace;
+                               default:
+                                       throw new ArgumentException(String.Format("The string doesn't represent any node type : {0}.", nodeTypeString));
+                       }
                }
 
-               public virtual void LoadXml(string xml)
+               [MonoTODO("default attributes (of imported doc); Entity; Notation")]
+               public virtual XmlNode ImportNode (XmlNode node, bool deep)
                {
-                       // TODO - implement XmlDocument.LoadXml
-                       throw new NotImplementedException("XmlDocument.LoadXml not implemented.");
+                       switch(node.NodeType)
+                       {
+                               case XmlNodeType.Attribute:
+                                       {
+                                               XmlAttribute src_att = node as XmlAttribute;
+                                               XmlAttribute dst_att = this.CreateAttribute (src_att.Prefix, src_att.LocalName, src_att.NamespaceURI);
+                                               dst_att.Value = src_att.Value;  // always explicitly specified (whether source is specified or not)
+                                               return dst_att;
+                                       }
+
+                               case XmlNodeType.CDATA:
+                                       return this.CreateCDataSection (node.Value);
+
+                               case XmlNodeType.Comment:
+                                       return this.CreateComment (node.Value);
+
+                               case XmlNodeType.Document:
+                                       throw new XmlException ("Document cannot be imported.");
+
+                               case XmlNodeType.DocumentFragment:
+                                       {
+                                               XmlDocumentFragment df = this.CreateDocumentFragment ();
+                                               if(deep)
+                                               {
+                                                       foreach(XmlNode n in node.ChildNodes)
+                                                       {
+                                                               df.AppendChild (this.ImportNode (n, deep));
+                                                       }
+                                               }
+                                               return df;
+                                       }
+
+                               case XmlNodeType.DocumentType:
+                                       throw new XmlException ("DocumentType cannot be imported.");
+
+                               case XmlNodeType.Element:
+                                       {
+                                               XmlElement src = (XmlElement)node;
+                                               XmlElement dst = this.CreateElement (src.Prefix, src.LocalName, src.NamespaceURI);
+                                               foreach(XmlAttribute attr in src.Attributes)
+                                               {
+                                                       if(attr.Specified)      // copies only specified attributes
+                                                               dst.SetAttributeNode ((XmlAttribute)this.ImportNode (attr, deep));
+                                                       if(DocumentType != null)
+                                                       {
+                                                               // TODO: create default attribute values
+                                                       }
+                                               }
+                                               if(deep)
+                                               {
+                                                       foreach(XmlNode n in src.ChildNodes)
+                                                               dst.AppendChild (this.ImportNode (n, deep));
+                                               }
+                                               return dst;
+                                       }
+
+                               case XmlNodeType.EndElement:
+                                       throw new XmlException ("Illegal ImportNode call for NodeType.EndElement");
+                               case XmlNodeType.EndEntity:
+                                       throw new XmlException ("Illegal ImportNode call for NodeType.EndEntity");
+
+                               case XmlNodeType.Entity:
+                                       throw new NotImplementedException ();   // TODO
+
+                               case XmlNodeType.EntityReference:
+                                       return this.CreateEntityReference (node.Name);
+
+                               case XmlNodeType.None:
+                                       throw new XmlException ("Illegal ImportNode call for NodeType.None");
+
+                               case XmlNodeType.Notation:
+                                       throw new NotImplementedException ();   // TODO
+
+                               case XmlNodeType.ProcessingInstruction:
+                                       XmlProcessingInstruction pi = node as XmlProcessingInstruction;
+                                       return this.CreateProcessingInstruction (pi.Target, pi.Data);
+
+                               case XmlNodeType.SignificantWhitespace:
+                                       return this.CreateSignificantWhitespace (node.Value);
+
+                               case XmlNodeType.Text:
+                                       return this.CreateTextNode (node.Value);
+
+                               case XmlNodeType.Whitespace:
+                                       return this.CreateWhitespace (node.Value);
+
+                               case XmlNodeType.XmlDeclaration:
+                                       XmlDeclaration srcDecl = node as XmlDeclaration;
+                                       return this.CreateXmlDeclaration (srcDecl.Version, srcDecl.Encoding, srcDecl.Standalone);
+
+                               default:
+                                       throw new NotImplementedException ();
+                       }
                }
 
-               public virtual void Save(Stream outStream)
+               public virtual void Load (Stream inStream)
                {
-                       // TODO - implement XmlDocument.Save(Stream)
-                       throw new NotImplementedException("XmlDocument.Save(Stream) not implemented.");
+                       XmlReader xmlReader = new XmlTextReader (inStream);
+                       Load (xmlReader);
                }
 
-               public virtual void Save(string filename)
+               public virtual void Load (string filename)
                {
-                       // TODO - implement XmlDocument.Save(string)
-                       throw new NotImplementedException("XmlDocument.Save(string) not implemented.");
+                       baseURI = filename;
+                       XmlReader xmlReader = new XmlTextReader (new StreamReader (filename));
+                       Load (xmlReader);
                }
 
-               public virtual void Save(TextWriter writer)
+               public virtual void Load (TextReader txtReader)
                {
-                       // TODO - implement XmlDocument.Save(TextWriter)
-                       throw new NotImplementedException("XmlDocument.Save(TextWriter) not implemented.");
+                       Load (new XmlTextReader (txtReader));
                }
 
-               public virtual void Save(XmlWriter writer)
+               public virtual void Load (XmlReader xmlReader)
                {
-                       // TODO - implement XmlDocument.Save(XmlWriter)
-                       throw new NotImplementedException("XmlDocument.Save(XmlWriter) not implemented.");
+                       // Reset our document
+                       // For now this just means removing all our children but later this
+                       // may turn out o need to call a private method that resets other things
+                       // like properties we have, etc.
+                       RemoveAll ();
+
+                       // create all contents with use of ReadNode()
+                       do {
+                               XmlNode n = ReadNode (xmlReader);
+                               if(n == null) break;
+                               AppendChild (n);
+                       } while (true);
                }
 
-               public override void WriteContentTo(XmlWriter w)
+               public virtual void LoadXml (string xml)
                {
-                       // TODO - implement XmlDocument.WriteContentTo
-                       throw new NotImplementedException("XmlDocument.WriteContentTo not implemented.");
+                       XmlReader xmlReader = new XmlTextReader (new StringReader (xml));
+                       Load (xmlReader);
                }
 
-               public override void WriteTo(XmlWriter w)
+               internal void onNodeChanged (XmlNode node, XmlNode Parent)
                {
-                       // TODO - implement XmlDocument.WriteTo
-                       throw new NotImplementedException("XmlDocument.WriteTo not implemented.");
+                       if (NodeChanged != null)
+                               NodeChanged (node, new XmlNodeChangedEventArgs
+                                       (XmlNodeChangedAction.Change,
+                                       node, Parent, Parent));
                }
 
-
-               // Internal functions
-               //===========================================================================
                internal void onNodeChanging(XmlNode node, XmlNode Parent)
                {
-                       if (NodeInserting != null)
-                               NodeChanging( new XmlNodeChangedEventArgs(XmlNodeChangedAction.Change,
+                       if (NodeChanging != null)
+                               NodeChanging (node, new XmlNodeChangedEventArgs
+                                       (XmlNodeChangedAction.Change,
                                        node, Parent, Parent));
                }
 
-               internal void onNodeChanged(XmlNode node, XmlNode Parent)
+               internal void onNodeInserted (XmlNode node, XmlNode newParent)
                {
-                       if (NodeChanged != null)
-                               NodeInserted( new XmlNodeChangedEventArgs(XmlNodeChangedAction.Change,
-                                       node, Parent, Parent));
+                       if (NodeInserted != null)
+                               NodeInserted (node, new XmlNodeChangedEventArgs
+                                       (XmlNodeChangedAction.Insert,
+                                       node, null, newParent));
                }
 
-               internal void onNodeInserting(XmlNode node, XmlNode newParent)
+               internal void onNodeInserting (XmlNode node, XmlNode newParent)
                {
                        if (NodeInserting != null)
-                               NodeInserting( new XmlNodeChangedEventArgs(XmlNodeChangedAction.Insert,
+                               NodeInserting (node, new XmlNodeChangedEventArgs
+                                       (XmlNodeChangedAction.Insert,
                                        node, null, newParent));
                }
 
-               internal void onNodeInserted(XmlNode node, XmlNode newParent)
+               internal void onNodeRemoved (XmlNode node, XmlNode oldParent)
                {
-                       if (NodeInserted != null)
-                               NodeInserted( new XmlNodeChangedEventArgs(XmlNodeChangedAction.Insert,
-                                       node, null, newParent));
+                       if (NodeRemoved != null)
+                               NodeRemoved (node, new XmlNodeChangedEventArgs
+                                       (XmlNodeChangedAction.Remove,
+                                       node, oldParent, null));
                }
 
-               internal void onNodeRemoving(XmlNode node, XmlNode oldParent)
+               internal void onNodeRemoving (XmlNode node, XmlNode oldParent)
                {
                        if (NodeRemoving != null)
-                               NodeRemoving(new XmlNodeChangedEventArgs(XmlNodeChangedAction.Remove,
+                               NodeRemoving (node, new XmlNodeChangedEventArgs
+                                       (XmlNodeChangedAction.Remove,
                                        node, oldParent, null));
                }
 
-               internal void onNodeRemoved(XmlNode node, XmlNode oldParent)
+               private void ParseName (string name, out string prefix, out string localName)
                {
-                       if (NodeRemoved != null)
-                               NodeRemoved(new XmlNodeChangedEventArgs(XmlNodeChangedAction.Remove,
-                                       node, oldParent, null));
+                       int indexOfColon = name.IndexOf (':');
+                       
+                       if (indexOfColon != -1) {
+                               prefix = name.Substring (0, indexOfColon);
+                               localName = name.Substring (indexOfColon + 1);
+                       } else {
+                               prefix = "";
+                               localName = name;
+                       }
+               }
+
+               // Checks that Element's name is valid
+               private void CheckName (String name)
+               {
+                       // TODO: others validations?
+                       if (name.IndexOf (" ") >= 0)
+                               throw new XmlException ("The ' ' characted cannot be included in a name");
+               }
 
+               // Reads XmlReader and creates Attribute Node.
+               private XmlAttribute ReadAttributeNode(XmlReader reader)
+               {
+                       if(reader.NodeType == XmlNodeType.Element)
+                               reader.MoveToFirstAttribute ();
+                       else if(reader.NodeType != XmlNodeType.Attribute)
+                               throw new InvalidOperationException ("bad position to read attribute.");
+                       XmlAttribute attribute = CreateAttribute (reader.Prefix, reader.LocalName, reader.NamespaceURI);
+                       ReadAttributeNodeValue (reader, attribute);
+                       return attribute;
                }
 
-               // Constructors
-               //===========================================================================
-               public XmlDocument() : base(null)
+               // Reads attribute from XmlReader and then creates attribute value children. XmlAttribute also uses this.
+               internal void ReadAttributeNodeValue(XmlReader reader, XmlAttribute attribute)
                {
+                       while(reader.ReadAttributeValue ()) {
+                               if(reader.NodeType == XmlNodeType.EntityReference)
+                                       // FIXME: if DocumentType is available, then try to resolve it.
+                                       attribute.AppendChild (CreateEntityReference (reader.Name));
+                               // FIXME: else if(NodeType == EndEntity) -- reset BaseURI and so on -- ;
+                               else
+                                       // (IMHO) Children of Attribute is likely restricted to Text and EntityReference.
+                                       attribute.AppendChild (CreateTextNode (reader.Value));
+                       }
                }
 
+               [MonoTODO("DTD parser is not completed.")]
+               public virtual XmlNode ReadNode(XmlReader reader)
+               {
+                       // This logic was formerly defined in 'XmlNode.ConstructDOM()'
+
+                       XmlNode resultNode = null;
+                       XmlNode newNode = null;
+                       XmlNode currentNode = null;
+                       // It was originally XmlDocument.Load(reader reader) when mcs was v0.16.
+                       int startDepth = reader.Depth;
+                       bool atStart = true;
+                       bool ignoredWhitespace;
+
+                       do {
+                               ignoredWhitespace = false;
+                               reader.Read ();
+                               // This complicated check is because we shouldn't make
+                               // improper additional XmlReader.Read() by this method itself.
+                               if(atStart && (reader.NodeType == XmlNodeType.EndElement || 
+                                       reader.NodeType == XmlNodeType.EndEntity))
+                                       throw new InvalidOperationException ("the XmlReader now holds invalid position.");
+                               atStart = false;
+                               switch (reader.NodeType) {
+
+                               case XmlNodeType.Attribute:
+                                       newNode = ReadAttributeNode (reader);
+                                       break;
+
+                               case XmlNodeType.CDATA:
+                                       newNode = CreateCDataSection (reader.Value);
+                                       if(currentNode != null)
+                                               currentNode.AppendChild (newNode);
+                                       break;
+
+                               case XmlNodeType.Comment:
+                                       newNode = CreateComment (reader.Value);
+                                       if(currentNode != null)
+                                               currentNode.AppendChild (newNode);
+                                       break;
+
+                               case XmlNodeType.Element:
+                                       XmlElement element = CreateElement (reader.Prefix, reader.LocalName, reader.NamespaceURI);
+                                       element.IsEmpty = reader.IsEmptyElement;
+                                       if(currentNode != null)
+                                               currentNode.AppendChild (element);
+                                       else
+                                               resultNode = element;
+
+                                       // set the element's attributes.
+                                       while (reader.MoveToNextAttribute ()) {
+                                               element.SetAttributeNode (ReadAttributeNode (reader));
+                                       }
+
+                                       reader.MoveToElement ();
+
+                                       if (!reader.IsEmptyElement)
+                                               currentNode = element;
+
+                                       break;
+
+                               case XmlNodeType.EndElement:
+                                       if(currentNode.Name != reader.Name)
+                                               throw new XmlException ("mismatch end tag.");
+                                       currentNode = currentNode.ParentNode;
+                                       break;
+
+                               case XmlNodeType.EndEntity:
+                                       break;  // no operation
+
+                               case XmlNodeType.ProcessingInstruction:
+                                       newNode = CreateProcessingInstruction (reader.Name, reader.Value);
+                                       if(currentNode != null)
+                                               currentNode.AppendChild (newNode);
+                                       break;
+
+                               case XmlNodeType.Text:
+                                       newNode = CreateTextNode (reader.Value);
+                                       if(currentNode != null)
+                                               currentNode.AppendChild (newNode);
+                                       break;
+
+                               case XmlNodeType.XmlDeclaration:
+                                       // empty strings are dummy, then gives over setting value contents to setter.
+                                       newNode = CreateXmlDeclaration ("1.0" , String.Empty, String.Empty);
+                                       ((XmlDeclaration)newNode).Value = reader.Value;
+                                       if(currentNode != null)
+                                               throw new XmlException ("XmlDeclaration at invalid position.");
+                                       break;
+
+                               case XmlNodeType.DocumentType:
+                                       // This logic is kinda hack;-)
+                                       XmlTextReader xtReader = reader as XmlTextReader;
+                                       if(xtReader == null) {
+                                               xtReader = new XmlTextReader (reader.ReadOuterXml (),
+                                                       XmlNodeType.DocumentType,
+                                                       new XmlParserContext (NameTable, ConstructNamespaceManager(), XmlLang, XmlSpace));
+                                               xtReader.Read ();
+                                       }
+                                       newNode = CreateDocumentType (xtReader.Name,
+                                               xtReader.GetAttribute ("PUBLIC"),
+                                               xtReader.GetAttribute ("SYSTEM"),
+                                               xtReader.Value);
+                                       if(currentNode != null)
+                                               throw new XmlException ("XmlDocumentType at invalid position.");
+                                       break;
+
+                               case XmlNodeType.EntityReference:
+                                       newNode = CreateEntityReference (reader.Name);
+                                       if(currentNode != null)
+                                               currentNode.AppendChild (newNode);
+                                       break;
+
+                               case XmlNodeType.SignificantWhitespace:
+                                       newNode = CreateSignificantWhitespace (reader.Value);
+                                       if(currentNode != null)
+                                               currentNode.AppendChild (newNode);
+                                       break;
+
+                               case XmlNodeType.Whitespace:
+                                       if(PreserveWhitespace) {
+                                               newNode = CreateWhitespace (reader.Value);
+                                               if(currentNode != null)
+                                                       currentNode.AppendChild (newNode);
+                                       }
+                                       else
+                                               ignoredWhitespace = true;
+                                       break;
+                               }
+                       } while(ignoredWhitespace ||
+                               reader.Depth > startDepth || 
+                               // This complicated condition is because reader.Depth was set
+                               // before XmlTextReader.depth increments ;-)
+                               (reader.Depth == startDepth && reader.NodeType == XmlNodeType.Element && reader.IsEmptyElement == false)
+                               );
+                       return resultNode != null ? resultNode : newNode;
+               }
 
+               public virtual void Save(Stream outStream)
+               {
+                       XmlTextWriter xmlWriter = new XmlTextWriter (outStream, Encoding.UTF8);
+                       xmlWriter.Formatting = Formatting.Indented;
+                       WriteContentTo (xmlWriter);
+                       xmlWriter.Close ();
+               }
+
+               public virtual void Save (string filename)
+               {
+                       XmlTextWriter xmlWriter = new XmlTextWriter (filename, Encoding.UTF8);
+                       xmlWriter.Formatting = Formatting.Indented;
+                       WriteContentTo (xmlWriter);
+                       xmlWriter.Close ();
+               }
+
+               [MonoTODO]
+               public virtual void Save (TextWriter writer)
+               {
+                       XmlTextWriter xmlWriter = new XmlTextWriter (writer);
+                       xmlWriter.Formatting = Formatting.Indented;
+                       WriteContentTo (xmlWriter);
+                       xmlWriter.Flush ();
+               }
+
+               public virtual void Save (XmlWriter xmlWriter)
+               {
+                       //
+                       // This should preserve white space if PreserveWhiteSpace is true
+                       //
+                       WriteContentTo (xmlWriter);
+                       xmlWriter.Flush ();
+               }
+
+               public override void WriteContentTo (XmlWriter w)
+               {
+                       foreach(XmlNode childNode in ChildNodes) {
+                               childNode.WriteTo (w);
+                       }
+               }
+
+               public override void WriteTo (XmlWriter w)
+               {
+                       WriteContentTo (w);
+               }
+
+               private void AddDefaultNameTableKeys ()
+               {
+                       // The following keys are default of MS .NET Framework
+                       nameTable.Add ("#text");
+                       nameTable.Add ("xml");
+                       nameTable.Add ("xmlns");
+                       nameTable.Add ("#entity");
+                       nameTable.Add ("#document-fragment");
+                       nameTable.Add ("#comment");
+                       nameTable.Add ("space");
+                       nameTable.Add ("id");
+                       nameTable.Add ("#whitespace");
+                       nameTable.Add ("http://www.w3.org/2000/xmlns/");
+                       nameTable.Add ("#cdata-section");
+                       nameTable.Add ("lang");
+                       nameTable.Add ("#document");
+                       nameTable.Add ("#significant-whitespace");
+               }
+               #endregion
        }
 }