mcs/class/System.XML/Mono.Xml.Schema/XsdValidatingReader.cs

   1 //
   2 // Mono.Xml.Schema.XsdValidatingReader.cs
   3 //
   4 // Author:
   5 //      Atsushi Enomoto (ginga@kit.hi-ho.ne.jp)
   6 //
   7 //      (C)2003 Atsushi Enomoto
   8 //
   9 // Note:
  10 //
  11 // This class doesn't support set_XmlResolver, since it isn't common to XmlReader interface.
  12 // Try to set that of xml reader which is used to construct this object.
  13 //
  14
  15 //
  16 // Permission is hereby granted, free of charge, to any person obtaining
  17 // a copy of this software and associated documentation files (the
  18 // "Software"), to deal in the Software without restriction, including
  19 // without limitation the rights to use, copy, modify, merge, publish,
  20 // distribute, sublicense, and/or sell copies of the Software, and to
  21 // permit persons to whom the Software is furnished to do so, subject to
  22 // the following conditions:
  23 //
  24 // The above copyright notice and this permission notice shall be
  25 // included in all copies or substantial portions of the Software.
  26 //
  27 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  28 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  29 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  30 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  31 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  32 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  33 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  34 //
  35 using System;
  36 using System.Collections;
  37 using System.Collections.Specialized;
  38 using System.Text;
  39 using System.Xml;
  40 using System.Xml.Schema;
  41 using Mono.Xml;
  42
  43 namespace Mono.Xml.Schema
  44 {
  45         internal class XsdValidatingReader : XmlReader, IXmlLineInfo, IHasXmlSchemaInfo, IHasXmlParserContext, IXmlNamespaceResolver
  46         {
  47                 static char [] wsChars = new char [] {' ', '\t', '\n', '\r'};
  48
  49                 XmlReader reader;
  50                 XmlValidatingReader xvReader;
  51                 XmlResolver resolver;
  52                 IHasXmlSchemaInfo sourceReaderSchemaInfo;
  53                 IXmlLineInfo readerLineInfo;
  54 //              bool laxElementValidation = true;
  55                 bool reportNoValidationError;
  56                 XmlSchemaSet schemas = new XmlSchemaSet ();
  57                 bool namespaces = true;
  58
  59                 Hashtable idList = new Hashtable ();
  60                 ArrayList missingIDReferences;
  61                 string thisElementId;
  62
  63                 ArrayList keyTables = new ArrayList ();
  64                 ArrayList currentKeyFieldConsumers;
  65
  66                 XsdValidationStateManager stateManager = new XsdValidationStateManager ();
  67                 XsdValidationContext context = new XsdValidationContext ();
  68                 XsdValidationState childParticleState;
  69
  70                 int xsiNilDepth = -1;
  71                 StringBuilder storedCharacters = new StringBuilder ();
  72                 bool shouldValidateCharacters;
  73                 int skipValidationDepth = -1;
  74
  75                 XmlSchemaAttribute [] defaultAttributes = new XmlSchemaAttribute [0];
  76                 int currentDefaultAttribute = -1;
  77                 XmlQualifiedName currentQName;
  78
  79                 ArrayList elementQNameStack = new ArrayList ();
  80                 bool popContext;
  81
  82                 // Property Cache.
  83                 int nonDefaultAttributeCount;
  84                 bool defaultAttributeConsumed;
  85
  86                 // Validation engine cached object
  87                 ArrayList defaultAttributesCache;
  88                 ArrayList tmpKeyrefPool;
  89
  90 #region .ctor
  91                 public XsdValidatingReader (XmlReader reader)
  92                         : this (reader, null)
  93                 {
  94                 }
  95
  96                 public XsdValidatingReader (XmlReader reader, XmlReader validatingReader)
  97                 {
  98                         this.reader = reader;
  99                         xvReader = validatingReader as XmlValidatingReader;
 100                         if (xvReader != null) {
 101                                 if (xvReader.ValidationType == ValidationType.None)
 102                                         reportNoValidationError = true;
 103                         }
 104                         readerLineInfo = reader as IXmlLineInfo;
 105                         sourceReaderSchemaInfo = reader as IHasXmlSchemaInfo;
 106                 }
 107 #endregion
 108                 // Provate Properties
 109                 private XmlQualifiedName CurrentQName {
 110                         get {
 111                                 if (currentQName == null)
 112                                         currentQName = new XmlQualifiedName (LocalName, NamespaceURI);
 113                                 return currentQName;
 114                         }
 115                 }
 116
 117                 internal ArrayList CurrentKeyFieldConsumers {
 118                         get {
 119                                 if (currentKeyFieldConsumers == null)
 120                                         currentKeyFieldConsumers = new ArrayList ();
 121                                 return currentKeyFieldConsumers;
 122                         }
 123                 }
 124
 125                 private ArrayList DefaultAttributesCache {
 126                         get {
 127                                 if (defaultAttributesCache == null)
 128                                         defaultAttributesCache = new ArrayList ();
 129                                 return defaultAttributesCache;
 130                         }
 131                 }
 132
 133                 private ArrayList MissingIDReferences {
 134                         get {
 135                                 if (missingIDReferences == null)
 136                                         missingIDReferences = new ArrayList ();
 137                                 return missingIDReferences;
 138                         }
 139                 }
 140
 141                 // Public Non-overrides
 142
 143                 public int XsiNilDepth {
 144                         get { return xsiNilDepth; }
 145                 }
 146
 147                 public bool Namespaces {
 148                         get { return namespaces; }
 149                         set { namespaces = value; }
 150                 }
 151
 152                 public XmlReader Reader {
 153                         get { return reader; }
 154                 }
 155
 156                 // This is required to resolve xsi:schemaLocation
 157                 public XmlResolver XmlResolver {
 158                         set {
 159                                 resolver = value;
 160                         }
 161                 }
 162
 163                 // This should be changed before the first Read() call.
 164                 public XmlSchemaSet Schemas {
 165                         get { return schemas; }
 166                         set {
 167                                 if (ReadState != ReadState.Initial)
 168                                         throw new InvalidOperationException ("Schemas must be set before the first call to Read().");
 169                                 schemas = value;
 170                         }
 171                 }
 172
 173                 public object SchemaType {
 174                         get {
 175                                 if (ReadState != ReadState.Interactive)
 176                                         return null;
 177
 178                                 switch (NodeType) {
 179                                 case XmlNodeType.Element:
 180                                         if (context.ActualType != null)
 181                                                 return context.ActualType;
 182                                         else if (context.Element != null)
 183                                                 return context.Element.ElementType;
 184                                         else
 185                                                 return SourceReaderSchemaType;
 186                                 case XmlNodeType.Attribute:
 187                                         XmlSchemaComplexType ct = context.ActualType as XmlSchemaComplexType;
 188                                         if (ct != null) {
 189                                                 XmlSchemaAttribute attdef = ct.AttributeUses [CurrentQName] as XmlSchemaAttribute;
 190                                                 if (attdef != null)
 191                                                         return attdef.AttributeType;
 192                                         }
 193                                         return SourceReaderSchemaType;
 194                                 default:
 195                                         return SourceReaderSchemaType;
 196                                 }
 197                         }
 198                 }
 199
 200                 private object SourceReaderSchemaType {
 201                         get { return this.sourceReaderSchemaInfo != null ? sourceReaderSchemaInfo.SchemaType : null; }
 202                 }
 203
 204                 // This property is never used in Mono.
 205                 public ValidationType ValidationType {
 206                         get {
 207                                 if (reportNoValidationError)
 208                                         return ValidationType.None;
 209                                 else
 210                                         return ValidationType.Schema;
 211                         }
 212                 }
 213
 214                 IDictionary IXmlNamespaceResolver.GetNamespacesInScope (XmlNamespaceScope scope)
 215                 {
 216                         IXmlNamespaceResolver resolver = reader as IXmlNamespaceResolver;
 217                         if (resolver == null)
 218                                 throw new NotSupportedException ("The input XmlReader does not implement IXmlNamespaceResolver and thus this validating reader cannot collect in-scope namespaces.");
 219                         return resolver.GetNamespacesInScope (scope);
 220                 }
 221
 222                 string IXmlNamespaceResolver.LookupPrefix (string ns)
 223                 {
 224                         return ((IXmlNamespaceResolver) this).LookupPrefix (ns, false);
 225                 }
 226
 227                 string IXmlNamespaceResolver.LookupPrefix (string ns, bool atomizedNames)
 228                 {
 229                         IXmlNamespaceResolver resolver = reader as IXmlNamespaceResolver;
 230                         if (resolver == null)
 231                                 throw new NotSupportedException ("The input XmlReader does not implement IXmlNamespaceResolver and thus this validating reader cannot execute namespace prefix lookup.");
 232                         return resolver.LookupPrefix (ns, atomizedNames);
 233                 }
 234
 235                 // It is used only for independent XmlReader use, not for XmlValidatingReader.
 236 #if NET_2_0
 237                 public override object ReadTypedValue ()
 238 #else
 239                 public object ReadTypedValue ()
 240 #endif
 241                 {
 242                         XmlSchemaDatatype dt = SchemaType as XmlSchemaDatatype;
 243                         XmlSchemaSimpleType st = SchemaType as XmlSchemaSimpleType;
 244                         if (st != null)
 245                                 dt = st.Datatype;
 246                         if (dt == null)
 247                                 return null;
 248
 249                         switch (NodeType) {
 250                         case XmlNodeType.Element:
 251                                 if (IsEmptyElement)
 252                                         return null;
 253
 254                                 storedCharacters.Length = 0;
 255                                 bool loop = true;
 256                                 do {
 257                                         Read ();
 258                                         switch (NodeType) {
 259                                         case XmlNodeType.SignificantWhitespace:
 260                                         case XmlNodeType.Text:
 261                                         case XmlNodeType.CDATA:
 262                                                 storedCharacters.Append (Value);
 263                                                 break;
 264                                         case XmlNodeType.Comment:
 265                                                 break;
 266                                         default:
 267                                                 loop = false;
 268                                                 break;
 269                                         }
 270                                 } while (loop && !EOF && ReadState == ReadState.Interactive);
 271                                 return dt.ParseValue (storedCharacters.ToString (), NameTable, ParserContext.NamespaceManager);
 272                         case XmlNodeType.Attribute:
 273                                 return dt.ParseValue (Value, NameTable, ParserContext.NamespaceManager);
 274                         }
 275                         return null;
 276                 }
 277
 278 //              public ValidationEventHandler ValidationEventHandler;
 279
 280                 // Public Overrided Properties
 281
 282                 public override int AttributeCount {
 283                         get {
 284                                 return nonDefaultAttributeCount + defaultAttributes.Length;
 285                         }
 286                 }
 287
 288                 public override string BaseURI {
 289                         get { return reader.BaseURI; }
 290                 }
 291
 292                 // If this class is used to implement XmlValidatingReader,
 293                 // it should be left to DTDValidatingReader. In other cases,
 294                 // it depends on the reader's ability.
 295                 public override bool CanResolveEntity {
 296                         get { return reader.CanResolveEntity; }
 297                 }
 298
 299                 public override int Depth {
 300                         get {
 301                                 if (currentDefaultAttribute < 0)
 302                                         return reader.Depth;
 303                                 if (this.defaultAttributeConsumed)
 304                                         return reader.Depth + 2;
 305                                 return reader.Depth + 1;
 306                         }
 307                 }
 308
 309                 public override bool EOF {
 310                         get { return reader.EOF; }
 311                 }
 312
 313                 public override bool HasValue {
 314                         get {
 315                                 if (currentDefaultAttribute < 0)
 316                                         return reader.HasValue;
 317                                 return true;
 318                         }
 319                 }
 320
 321                 public override bool IsDefault {
 322                         get {
 323                                 if (currentDefaultAttribute < 0)
 324                                         return reader.IsDefault;
 325                                 return true;
 326                         }
 327                 }
 328
 329                 public override bool IsEmptyElement {
 330                         get {
 331                                 if (currentDefaultAttribute < 0)
 332                                         return reader.IsEmptyElement;
 333                                 return false;
 334                         }
 335                 }
 336
 337                 public override string this [int i] {
 338                         get { return GetAttribute (i); }
 339                 }
 340
 341                 public override string this [string name] {
 342                         get { return GetAttribute (name); }
 343                 }
 344
 345                 public override string this [string localName, string ns] {
 346                         get { return GetAttribute (localName, ns); }
 347                 }
 348
 349                 int IXmlLineInfo.LineNumber {
 350                         get { return readerLineInfo != null ? readerLineInfo.LineNumber : 0; }
 351                 }
 352
 353                 int IXmlLineInfo.LinePosition {
 354                         get { return readerLineInfo != null ? readerLineInfo.LinePosition : 0; }
 355                 }
 356
 357                 public override string LocalName {
 358                         get {
 359                                 if (currentDefaultAttribute < 0)
 360                                         return reader.LocalName;
 361                                 if (defaultAttributeConsumed)
 362                                         return String.Empty;
 363                                 return defaultAttributes [currentDefaultAttribute].QualifiedName.Name;
 364                         }
 365                 }
 366
 367                 public override string Name {
 368                         get {
 369                                 if (currentDefaultAttribute < 0)
 370                                         return reader.Name;
 371                                 if (defaultAttributeConsumed)
 372                                         return String.Empty;
 373
 374                                 XmlQualifiedName qname = defaultAttributes [currentDefaultAttribute].QualifiedName;
 375                                 string prefix = Prefix;
 376                                 if (prefix == String.Empty)
 377                                         return qname.Name;
 378                                 else
 379                                         return String.Concat (prefix, ":", qname.Name);
 380                         }
 381                 }
 382
 383                 public override string NamespaceURI {
 384                         get {
 385                                 if (currentDefaultAttribute < 0)
 386                                         return reader.NamespaceURI;
 387                                 if (defaultAttributeConsumed)
 388                                         return String.Empty;
 389                                 return defaultAttributes [currentDefaultAttribute].QualifiedName.Namespace;
 390                         }
 391                 }
 392
 393                 public override XmlNameTable NameTable {
 394                         get { return reader.NameTable; }
 395                 }
 396
 397                 public override XmlNodeType NodeType {
 398                         get {
 399                                 if (currentDefaultAttribute < 0)
 400                                         return reader.NodeType;
 401                                 if (defaultAttributeConsumed)
 402                                         return XmlNodeType.Text;
 403                                 return XmlNodeType.Attribute;
 404                         }
 405                 }
 406
 407                 public XmlParserContext ParserContext {
 408                         get { return XmlSchemaUtil.GetParserContext (reader); }
 409                 }
 410
 411                 public override string Prefix {
 412                         get {
 413                                 if (currentDefaultAttribute < 0)
 414                                         return reader.Prefix;
 415                                 if (defaultAttributeConsumed)
 416                                         return String.Empty;
 417                                 XmlQualifiedName qname = defaultAttributes [currentDefaultAttribute].QualifiedName;
 418                                 string prefix = this.ParserContext.NamespaceManager.LookupPrefix (qname.Namespace, false);
 419                                 if (prefix == null)
 420                                         return String.Empty;
 421                                 else
 422                                         return prefix;
 423                         }
 424                 }
 425
 426                 public override char QuoteChar {
 427                         get { return reader.QuoteChar; }
 428                 }
 429
 430                 public override ReadState ReadState {
 431                         get { return reader.ReadState; }
 432                 }
 433
 434                 public override string Value {
 435                         get {
 436                                 if (currentDefaultAttribute < 0)
 437                                         return reader.Value;
 438                                 string value = defaultAttributes [currentDefaultAttribute].ValidatedDefaultValue;
 439                                 if (value == null)
 440                                         value = defaultAttributes [currentDefaultAttribute].ValidatedFixedValue;
 441                                 return value;
 442                         }
 443                 }
 444
 445                 public override string XmlLang {
 446                         get {
 447                                 string xmlLang = reader.XmlLang;
 448                                 if (xmlLang != null)
 449                                         return xmlLang;
 450                                 int idx = this.FindDefaultAttribute ("lang", XmlNamespaceManager.XmlnsXml);
 451                                 if (idx < 0)
 452                                         return null;
 453                                 xmlLang = defaultAttributes [idx].ValidatedDefaultValue;
 454                                 if (xmlLang == null)
 455                                         xmlLang = defaultAttributes [idx].ValidatedFixedValue;
 456                                 return xmlLang;
 457                         }
 458                 }
 459
 460                 public override XmlSpace XmlSpace {
 461                         get {
 462                                 XmlSpace space = reader.XmlSpace;
 463                                 if (space != XmlSpace.None)
 464                                         return space;
 465                                 int idx = this.FindDefaultAttribute ("space", XmlNamespaceManager.XmlnsXml);
 466                                 if (idx < 0)
 467                                         return XmlSpace.None;
 468                                 string spaceSpec = defaultAttributes [idx].ValidatedDefaultValue;
 469                                 if (spaceSpec == null)
 470                                         spaceSpec = defaultAttributes [idx].ValidatedFixedValue;
 471                                 return (XmlSpace) Enum.Parse (typeof (XmlSpace), spaceSpec, false);
 472                         }
 473                 }
 474
 475                 // Private Methods
 476
 477                 private XmlQualifiedName QualifyName (string name)
 478                 {
 479                         return XmlQualifiedName.Parse (name, this);
 480                 }
 481
 482                 private void HandleError (string error)
 483                 {
 484                         HandleError (error, null);
 485                 }
 486
 487                 private void HandleError (string error, Exception innerException)
 488                 {
 489                         HandleError (error, innerException, false);
 490                 }
 491
 492                 private void HandleError (string error, Exception innerException, bool isWarning)
 493                 {
 494                         if (reportNoValidationError)    // extra quick check
 495                                 return;
 496
 497                         XmlSchemaException schemaException = new XmlSchemaException (error,
 498                                         this, this.BaseURI, null, innerException);
 499                         HandleError (schemaException, isWarning);
 500                 }
 501
 502                 private void HandleError (XmlSchemaException schemaException)
 503                 {
 504                         HandleError (schemaException, false);
 505                 }
 506
 507                 private void HandleError (XmlSchemaException schemaException, bool isWarning)
 508                 {
 509                         if (reportNoValidationError)
 510                                 return;
 511
 512                         ValidationEventArgs e = new ValidationEventArgs (schemaException,
 513                                 schemaException.Message, isWarning ? XmlSeverityType.Warning : XmlSeverityType.Error);
 514
 515                         /*if (this.ValidationEventHandler != null)
 516                                 this.ValidationEventHandler (this, e);
 517                         else */if (xvReader != null)
 518                                 xvReader.OnValidationEvent (this, e);
 519                         else if (e.Severity == XmlSeverityType.Error)
 520 #if NON_MONO_ENV
 521                                 this.xvReader.OnValidationEvent (this, e);
 522 #else
 523                                 throw e.Exception;
 524 #endif
 525                 }
 526
 527                 private XmlSchemaElement FindElement (string name, string ns)
 528                 {
 529                         return (XmlSchemaElement) schemas.GlobalElements [new XmlQualifiedName (name, ns)];
 530                 }
 531
 532                 private XmlSchemaType FindType (XmlQualifiedName qname)
 533                 {
 534                         return (XmlSchemaType) schemas.GlobalTypes [qname];
 535                 }
 536
 537                 private void ValidateStartElementParticle ()
 538                 {
 539                         stateManager.CurrentElement = null;
 540                         context.ParticleState = context.ParticleState.EvaluateStartElement (reader.LocalName, reader.NamespaceURI);
 541                         if (context.ParticleState == XsdValidationState.Invalid)
 542                                 HandleError ("Invalid start element: " + reader.NamespaceURI + ":" + reader.LocalName);
 543
 544                         context.Element = stateManager.CurrentElement;
 545                         if (context.Element != null)
 546                                 context.SchemaType = context.Element.ElementType;
 547                 }
 548
 549                 private void ValidateEndElementParticle ()
 550                 {
 551                         if (childParticleState != null) {
 552                                 if (!childParticleState.EvaluateEndElement ()) {
 553                                         HandleError ("Invalid end element: " + reader.Name);
 554                                 }
 555                         }
 556                         context.PopScope (reader.Depth);
 557                 }
 558
 559                 // Utility for missing validation completion related to child items.
 560                 private void ValidateCharacters ()
 561                 {
 562                         if (xsiNilDepth >= 0 && xsiNilDepth < reader.Depth)
 563                                 HandleError ("Element item appeared, while current element context is nil.");
 564
 565                         storedCharacters.Append (reader.Value);
 566                 }
 567
 568                 // Utility for missing validation completion related to child items.
 569                 private void ValidateEndCharacters ()
 570                 {
 571                         if (context.ActualType == null)
 572                                 return;
 573
 574                         string value = storedCharacters.ToString ();
 575
 576                         if (storedCharacters.Length == 0) {
 577                                 // 3.3.4 Element Locally Valid (Element) 5.1.2
 578                                 if (context.Element != null) {
 579                                         if (context.Element.ValidatedDefaultValue != null)
 580                                                 value = context.Element.ValidatedDefaultValue;
 581                                 }
 582                         }
 583
 584                         XmlSchemaDatatype dt = context.ActualType as XmlSchemaDatatype;
 585                         XmlSchemaSimpleType st = context.ActualType as XmlSchemaSimpleType;
 586                         if (dt == null) {
 587                                 if (st != null) {
 588                                         dt = st.Datatype;
 589                                 } else {
 590                                         XmlSchemaComplexType ct = context.ActualType as XmlSchemaComplexType;
 591                                         dt = ct.Datatype;
 592                                         switch (ct.ContentType) {
 593                                         case XmlSchemaContentType.ElementOnly:
 594                                         case XmlSchemaContentType.Empty:
 595                                                 if (storedCharacters.Length > 0)
 596                                                         HandleError ("Character content not allowed.");
 597                                                 break;
 598                                         }
 599                                 }
 600                         }
 601                         if (dt != null) {
 602                                 // 3.3.4 Element Locally Valid (Element) :: 5.2.2.2. Fixed value constraints
 603                                 if (context.Element != null && context.Element.ValidatedFixedValue != null)
 604                                         if (value != context.Element.ValidatedFixedValue)
 605                                                 HandleError ("Fixed value constraint was not satisfied.");
 606                                 AssessStringValid (st, dt, value);
 607                         }
 608
 609                         // Identity field value
 610                         if (currentKeyFieldConsumers != null) {
 611                                 while (this.currentKeyFieldConsumers.Count > 0) {
 612                                         XsdKeyEntryField field = this.currentKeyFieldConsumers [0] as XsdKeyEntryField;
 613                                         if (field.Identity != null)
 614                                                 HandleError ("Two or more identical field was found. Former value is '" + field.Identity + "' .");
 615                                         object identity = null; // This means empty value
 616                                         if (dt != null) {
 617                                                 try {
 618                                                         identity = dt.ParseValue (value, NameTable, ParserContext.NamespaceManager);
 619                                                 } catch (Exception ex) { // FIXME: (wishlist) This is bad manner ;-(
 620                                                         HandleError ("Identity value is invalid against its data type " + dt.TokenizedType, ex);
 621                                                 }
 622                                         }
 623                                         if (identity == null)
 624                                                 identity = value;
 625
 626                                         if (!field.SetIdentityField (identity, reader.Depth == xsiNilDepth, dt as XsdAnySimpleType, this))
 627                                                 HandleError ("Two or more identical key value was found: '" + value + "' .");
 628                                         this.currentKeyFieldConsumers.RemoveAt (0);
 629                                 }
 630                         }
 631
 632                         shouldValidateCharacters = false;
 633                 }
 634
 635                 // 3.14.4 String Valid
 636                 private void AssessStringValid (XmlSchemaSimpleType st,
 637                         XmlSchemaDatatype dt, string value)
 638                 {
 639                         XmlSchemaDatatype validatedDatatype = dt;
 640                         if (st != null) {
 641                                 string normalized = validatedDatatype.Normalize (value);
 642                                 string [] values;
 643                                 XmlSchemaDatatype itemDatatype;
 644                                 XmlSchemaSimpleType itemSimpleType;
 645                                 switch (st.DerivedBy) {
 646                                 case XmlSchemaDerivationMethod.List:
 647                                         XmlSchemaSimpleTypeList listContent = st.Content as XmlSchemaSimpleTypeList;
 648                                         values = normalized.Split (wsChars);
 649                                         itemDatatype = listContent.ValidatedListItemType as XmlSchemaDatatype;
 650                                         itemSimpleType = listContent.ValidatedListItemType as XmlSchemaSimpleType;
 651                                         for (int vi = 0; vi < values.Length; vi++) {
 652                                                 string each = values [vi];
 653                                                 if (each == String.Empty)
 654                                                         continue;
 655                                                 // validate against ValidatedItemType
 656                                                 if (itemDatatype != null) {
 657                                                         try {
 658                                                                 itemDatatype.ParseValue (each, NameTable, ParserContext.NamespaceManager);
 659                                                         } catch (Exception ex) { // FIXME: (wishlist) better exception handling ;-(
 660                                                                 HandleError ("List type value contains one or more invalid values.", ex);
 661                                                                 break;
 662                                                         }
 663                                                 }
 664                                                 else
 665                                                         AssessStringValid (itemSimpleType, itemSimpleType.Datatype, each);
 666                                         }
 667                                         break;
 668                                 case XmlSchemaDerivationMethod.Union:
 669                                         XmlSchemaSimpleTypeUnion union = st.Content as XmlSchemaSimpleTypeUnion;
 670                                         {
 671                                                 string each = normalized;
 672                                                 // validate against ValidatedItemType
 673                                                 bool passed = false;
 674                                                 foreach (object eachType in union.ValidatedTypes) {
 675                                                         itemDatatype = eachType as XmlSchemaDatatype;
 676                                                         itemSimpleType = eachType as XmlSchemaSimpleType;
 677                                                         if (itemDatatype != null) {
 678                                                                 try {
 679                                                                         itemDatatype.ParseValue (each, NameTable, ParserContext.NamespaceManager);
 680                                                                 } catch (Exception) { // FIXME: (wishlist) better exception handling ;-(
 681                                                                         continue;
 682                                                                 }
 683                                                         }
 684                                                         else {
 685                                                                 try {
 686                                                                         AssessStringValid (itemSimpleType, itemSimpleType.Datatype, each);
 687                                                                 } catch (XmlSchemaException) {
 688                                                                         continue;
 689                                                                 }
 690                                                         }
 691                                                         passed = true;
 692                                                         break;
 693                                                 }
 694                                                 if (!passed) {
 695                                                         HandleError ("Union type value contains one or more invalid values.");
 696                                                         break;
 697                                                 }
 698                                         }
 699                                         break;
 700                                 case XmlSchemaDerivationMethod.Restriction:
 701                                         XmlSchemaSimpleTypeRestriction str = st.Content as XmlSchemaSimpleTypeRestriction;
 702                                         // facet validation
 703                                         if (str != null) {
 704                                                 /* Don't forget to validate against inherited type's facets
 705                                                  * Could we simplify this by assuming that the basetype will also
 706                                                  * be restriction?
 707                                                  * */
 708                                                  // mmm, will check later.
 709                                                 XmlSchemaSimpleType baseType = st.BaseXmlSchemaType as XmlSchemaSimpleType;
 710                                                 if (baseType != null) {
 711                                                          AssessStringValid(baseType, dt, normalized);
 712                                                 }
 713                                                 if (!str.ValidateValueWithFacets (normalized, NameTable)) {
 714                                                         HandleError ("Specified value was invalid against the facets.");
 715                                                         break;
 716                                                 }
 717                                         }
 718                                         validatedDatatype = st.Datatype;
 719                                         break;
 720                                 }
 721                         }
 722                         if (validatedDatatype != null) {
 723                                 try {
 724                                         validatedDatatype.ParseValue (value, NameTable, ParserContext.NamespaceManager);
 725                                 } catch (Exception ex) {        // FIXME: (wishlist) It is bad manner ;-(
 726                                         HandleError ("Invalidly typed data was specified.", ex);
 727                                 }
 728                         }
 729                 }
 730
 731                 private object GetLocalTypeDefinition (string name)
 732                 {
 733                         object xsiType = null;
 734                         XmlQualifiedName typeQName = QualifyName (name);
 735                         if (typeQName == XmlSchemaComplexType.AnyTypeName)
 736                                 xsiType = XmlSchemaComplexType.AnyType;
 737                         else if (XmlSchemaUtil.IsBuiltInDatatypeName (typeQName))
 738                                 xsiType = XmlSchemaDatatype.FromName (typeQName);
 739                         else
 740                                 xsiType = FindType (typeQName);
 741                         return xsiType;
 742                 }
 743
 744                 // It is common to ElementLocallyValid::4 and SchemaValidityAssessment::1.2.1.2.4
 745                 private void AssessLocalTypeDerivationOK (object xsiType, object baseType, XmlSchemaDerivationMethod flag)
 746                 {
 747                         XmlSchemaType xsiSchemaType = xsiType as XmlSchemaType;
 748                         XmlSchemaComplexType baseComplexType = baseType as XmlSchemaComplexType;
 749                         XmlSchemaComplexType xsiComplexType = xsiSchemaType as XmlSchemaComplexType;
 750                         if (xsiType != baseType) {
 751                                 // Extracted (not extraneous) check for 3.4.6 TypeDerivationOK.
 752                                 if (baseComplexType != null)
 753                                         flag |= baseComplexType.BlockResolved;
 754                                 if (flag == XmlSchemaDerivationMethod.All) {
 755                                         HandleError ("Prohibited element type substitution.");
 756                                         return;
 757                                 } else if (xsiSchemaType != null && (flag & xsiSchemaType.DerivedBy) != 0) {
 758                                         HandleError ("Prohibited element type substitution.");
 759                                         return;
 760                                 }
 761                         }
 762
 763                         if (xsiComplexType != null)
 764                                 try {
 765                                         xsiComplexType.ValidateTypeDerivationOK (baseType, null, null);
 766                                 } catch (XmlSchemaException ex) {
 767 //                                      HandleError ("Locally specified schema complex type derivation failed. " + ex.Message, ex);
 768                                         HandleError (ex);
 769                                 }
 770                         else {
 771                                 XmlSchemaSimpleType xsiSimpleType = xsiType as XmlSchemaSimpleType;
 772                                 if (xsiSimpleType != null) {
 773                                         try {
 774                                                 xsiSimpleType.ValidateTypeDerivationOK (baseType, null, null, true);
 775                                         } catch (XmlSchemaException ex) {
 776 //                                              HandleError ("Locally specified schema simple type derivation failed. " + ex.Message, ex);
 777                                                 HandleError (ex);
 778                                         }
 779                                 }
 780                                 else if (xsiType is XmlSchemaDatatype) {
 781                                         // do nothing
 782                                 }
 783                                 else
 784                                         HandleError ("Primitive data type cannot be derived type using xsi:type specification.");
 785                         }
 786                 }
 787
 788                 // Section 3.3.4 of the spec.
 789                 private void AssessStartElementSchemaValidity ()
 790                 {
 791                         // If the reader is inside xsi:nil (and failed on validation),
 792                         // then simply skip its content.
 793                         if (xsiNilDepth >= 0 && xsiNilDepth < reader.Depth)
 794                                 HandleError ("Element item appeared, while current element context is nil.");
 795
 796                         context.Load (reader.Depth);
 797                         if (childParticleState != null) {
 798                                 context.ParticleState = childParticleState;
 799                                 childParticleState = null;
 800                         }
 801
 802                         // If validation state exists, then first assess particle validity.
 803                         context.SchemaType = null;
 804                         if (context.ParticleState != null) {
 805                                 ValidateStartElementParticle ();
 806                         }
 807
 808                         string xsiNilValue = reader.GetAttribute ("nil", XmlSchema.InstanceNamespace);
 809                         if (xsiNilValue != null)
 810                                 xsiNilValue = xsiNilValue.Trim (XmlChar.WhitespaceChars);
 811                         bool isXsiNil = xsiNilValue == "true";
 812                         if (isXsiNil && this.xsiNilDepth < 0)
 813                                 xsiNilDepth = reader.Depth;
 814
 815                         // [Schema Validity Assessment (Element) 1.2]
 816                         // Evaluate "local type definition" from xsi:type.
 817                         // (See spec 3.3.4 Schema Validity Assessment (Element) 1.2.1.2.3.
 818                         // Note that Schema Validity Assessment(Element) 1.2 takes
 819                         // precedence than 1.1 of that.
 820
 821                         string xsiTypeName = reader.GetAttribute ("type", XmlSchema.InstanceNamespace);
 822                         if (xsiTypeName != null) {
 823                                 xsiTypeName = xsiTypeName.Trim (XmlChar.WhitespaceChars);
 824                                 object xsiType = GetLocalTypeDefinition (xsiTypeName);
 825                                 if (xsiType == null)
 826                                         HandleError ("The instance type was not found: " + xsiTypeName + " .");
 827                                 else {
 828                                         XmlSchemaType xsiSchemaType = xsiType as XmlSchemaType;
 829                                         if (xsiSchemaType != null && this.context.Element != null) {
 830                                                 XmlSchemaType elemBaseType = context.Element.ElementType as XmlSchemaType;
 831                                                 if (elemBaseType != null && (xsiSchemaType.DerivedBy & elemBaseType.FinalResolved) != 0)
 832                                                         HandleError ("The instance type is prohibited by the type of the context element.");
 833                                                 if (elemBaseType != xsiType && (xsiSchemaType.DerivedBy & this.context.Element.BlockResolved) != 0)
 834                                                         HandleError ("The instance type is prohibited by the context element.");
 835                                         }
 836                                         XmlSchemaComplexType xsiComplexType = xsiType as XmlSchemaComplexType;
 837                                         if (xsiComplexType != null && xsiComplexType.IsAbstract)
 838                                                 HandleError ("The instance type is abstract: " + xsiTypeName + " .");
 839                                         else {
 840                                                 // If current schema type exists, then this xsi:type must be
 841                                                 // valid extension of that type. See 1.2.1.2.4.
 842                                                 if (context.Element != null) {
 843                                                         AssessLocalTypeDerivationOK (xsiType, context.Element.ElementType, context.Element.BlockResolved);
 844                                                 }
 845                                                 AssessStartElementLocallyValidType (xsiType);   // 1.2.2:
 846                                                 context.LocalTypeDefinition = xsiType;
 847                                         }
 848                                 }
 849                         }
 850                         else
 851                                 context.LocalTypeDefinition = null;
 852
 853                         // Create Validation Root, if not exist.
 854                         // [Schema Validity Assessment (Element) 1.1]
 855                         if (context.Element == null)
 856                                 context.Element = FindElement (reader.LocalName, reader.NamespaceURI);
 857                         if (context.Element != null) {
 858                                 if (xsiTypeName == null) {
 859                                         context.SchemaType = context.Element.ElementType;
 860                                         AssessElementLocallyValidElement (context.Element, xsiNilValue);        // 1.1.2
 861                                 }
 862                         } else {
 863                                 switch (stateManager.ProcessContents) {
 864                                 case XmlSchemaContentProcessing.Skip:
 865                                         break;
 866                                 case XmlSchemaContentProcessing.Lax:
 867                                         /*
 868                                         schema = schemas [reader.NamespaceURI];
 869                                         if (schema != null && !schema.missedSubComponents)
 870                                                 HandleError ("Element declaration for " + reader.LocalName + " is missing.");
 871                                         */
 872                                         break;
 873                                 default:
 874                                         if (xsiTypeName == null &&
 875                                                 (schemas.Contains (reader.NamespaceURI) ||
 876                                                 !schemas.MissedSubComponents (reader.NamespaceURI)))
 877                                                 HandleError ("Element declaration for " + reader.LocalName + " is missing.");
 878                                         break;
 879                                 }
 880                         }
 881
 882                         if (stateManager.ProcessContents == XmlSchemaContentProcessing.Skip)
 883                                 skipValidationDepth = reader.Depth;
 884
 885                         // Finally, create child particle state.
 886                         XmlSchemaComplexType xsComplexType = SchemaType as XmlSchemaComplexType;
 887                         if (xsComplexType != null)
 888                                 childParticleState = stateManager.Create (xsComplexType.ValidatableParticle);
 889                         else if (stateManager.ProcessContents == XmlSchemaContentProcessing.Lax)
 890                                 childParticleState = stateManager.Create (XmlSchemaAny.AnyTypeContent);
 891                         else
 892                                 childParticleState = stateManager.Create (XmlSchemaParticle.Empty);
 893
 894                         AssessStartIdentityConstraints ();
 895
 896                         context.PushScope (reader.Depth);
 897                 }
 898
 899                 // 3.3.4 Element Locally Valid (Element)
 900                 private void AssessElementLocallyValidElement (XmlSchemaElement element, string xsiNilValue)
 901                 {
 902                         XmlQualifiedName qname = new XmlQualifiedName (reader.LocalName, reader.NamespaceURI);
 903                         // 1.
 904                         if (element == null)
 905                                 HandleError ("Element declaration is required for " + qname);
 906                         // 2.
 907                         if (element.ActualIsAbstract)
 908                                 HandleError ("Abstract element declaration was specified for " + qname);
 909                         // 3.1.
 910                         if (!element.ActualIsNillable && xsiNilValue != null)
 911                                 HandleError ("This element declaration is not nillable: " + qname);
 912                         // 3.2.
 913                         // Note that 3.2.1 xsi:nil constraints are to be validated in
 914                         else if (xsiNilValue == "true") {
 915                                 // AssessElementSchemaValidity() and ValidateCharacters()
 916
 917                                 if (element.ValidatedFixedValue != null)
 918                                         HandleError ("Schema instance nil was specified, where the element declaration for " + qname + "has fixed value constraints.");
 919                         }
 920                         // 4.
 921                         string xsiType = reader.GetAttribute ("type", XmlSchema.InstanceNamespace);
 922                         if (xsiType != null) {
 923                                 context.LocalTypeDefinition = GetLocalTypeDefinition (xsiType);
 924                                 AssessLocalTypeDerivationOK (context.LocalTypeDefinition, element.ElementType, element.BlockResolved);
 925                         }
 926                         else
 927                                 context.LocalTypeDefinition = null;
 928
 929                         // 5 Not all things cannot be assessed here.
 930                         // It is common to 5.1 and 5.2
 931                         if (element.ElementType != null)
 932                                 AssessStartElementLocallyValidType (SchemaType);
 933
 934                         // 6. should be out from here.
 935                         // See invokation of AssessStartIdentityConstraints().
 936
 937                         // 7 is going to be validated in Read() (in case of xmlreader's EOF).
 938                 }
 939
 940                 // 3.3.4 Element Locally Valid (Type)
 941                 private void AssessStartElementLocallyValidType (object schemaType)
 942                 {
 943                         if (schemaType == null) {       // 1.
 944                                 HandleError ("Schema type does not exist.");
 945                                 return;
 946                         }
 947                         XmlSchemaComplexType cType = schemaType as XmlSchemaComplexType;
 948                         XmlSchemaSimpleType sType = schemaType as XmlSchemaSimpleType;
 949                         if (sType != null) {
 950                                 // 3.1.1.
 951                                 while (reader.MoveToNextAttribute ()) {
 952                                         if (reader.NamespaceURI == XmlNamespaceManager.XmlnsXmlns)
 953                                                 continue;
 954                                         if (reader.NamespaceURI != XmlSchema.InstanceNamespace)
 955                                                 HandleError ("Current simple type cannot accept attributes other than schema instance namespace.");
 956                                         switch (reader.LocalName) {
 957                                         case "type":
 958                                         case "nil":
 959                                         case "schemaLocation":
 960                                         case "noNamespaceSchemaLocation":
 961                                                 break;
 962                                         default:
 963                                                 HandleError ("Unknown schema instance namespace attribute: " + reader.LocalName);
 964                                                 break;
 965                                         }
 966                                 }
 967                                 reader.MoveToElement ();
 968                                 // 3.1.2 and 3.1.3 cannot be assessed here.
 969                         } else if (cType != null) {
 970                                 if (cType.IsAbstract) { // 2.
 971                                         HandleError ("Target complex type is abstract.");
 972                                         return;
 973                                 }
 974                                 // 3.2
 975                                 AssessElementLocallyValidComplexType (cType);
 976                         }
 977                 }
 978
 979                 // 3.4.4 Element Locally Valid (Complex Type)
 980                 private void AssessElementLocallyValidComplexType (XmlSchemaComplexType cType)
 981                 {
 982                         // 1.
 983                         if (cType.IsAbstract)
 984                                 HandleError ("Target complex type is abstract.");
 985
 986                         // 2 (xsi:nil and content prohibition)
 987                         // See AssessStartElementSchemaValidity() and ValidateCharacters()
 988
 989                         string elementNs = reader.NamespaceURI;
 990                         // 3. attribute uses and
 991                         // 5. wild IDs
 992                         while (reader.MoveToNextAttribute ()) {
 993                                 if (reader.NamespaceURI == "http://www.w3.org/2000/xmlns/")
 994                                         continue;
 995                                 else if (reader.NamespaceURI == XmlSchema.InstanceNamespace)
 996                                         continue;
 997                                 XmlQualifiedName qname = new XmlQualifiedName (reader.LocalName, reader.NamespaceURI);
 998                                 XmlSchemaObject attMatch = FindAttributeDeclaration (cType, qname, elementNs);
 999                                 if (attMatch == null)
1000                                         HandleError ("Attribute declaration was not found for " + qname);
1001                                 else {
1002                                         XmlSchemaAttribute attdecl = attMatch as XmlSchemaAttribute;
1003                                         if (attdecl == null) { // i.e. anyAttribute
1004 //                                              XmlSchemaAnyAttribute anyAttrMatch = attMatch as XmlSchemaAnyAttribute;
1005                                         } else {
1006                                                 AssessAttributeLocallyValidUse (attdecl);
1007                                                 AssessAttributeLocallyValid (attdecl, true);
1008                                         }
1009                                 }
1010                         }
1011                         reader.MoveToElement ();
1012
1013                         // Collect default attributes.
1014                         // 4.
1015                         foreach (DictionaryEntry entry in cType.AttributeUses) {
1016                                 XmlSchemaAttribute attr = (XmlSchemaAttribute) entry.Value;
1017                                 if (reader [attr.QualifiedName.Name, attr.QualifiedName.Namespace] == null) {
1018                                         if (attr.ValidatedUse == XmlSchemaUse.Required &&
1019                                                 attr.ValidatedFixedValue == null)
1020                                                 HandleError ("Required attribute " + attr.QualifiedName + " was not found.");
1021                                         else if (attr.ValidatedDefaultValue != null)
1022                                                 DefaultAttributesCache.Add (attr);
1023                                         else if (attr.ValidatedFixedValue != null)
1024                                                 DefaultAttributesCache.Add (attr);
1025                                 }
1026                         }
1027                         defaultAttributes = (XmlSchemaAttribute [])
1028                                 DefaultAttributesCache.ToArray (typeof (XmlSchemaAttribute));
1029                         context.DefaultAttributes = defaultAttributes;
1030                         if (defaultAttributesCache != null)
1031                                 defaultAttributesCache.Clear ();
1032                         // 5. wild IDs was already checked above.
1033                 }
1034
1035                 // Spec 3.10.4 Item Valid (Wildcard)
1036                 private bool AttributeWildcardItemValid (XmlSchemaAnyAttribute anyAttr, XmlQualifiedName qname)
1037                 {
1038                         if (anyAttr.HasValueAny)
1039                                 return true;
1040                         if (anyAttr.HasValueOther && (anyAttr.TargetNamespace == "" || reader.NamespaceURI != anyAttr.TargetNamespace))
1041                                 return true;
1042                         if (anyAttr.HasValueTargetNamespace && reader.NamespaceURI == anyAttr.TargetNamespace)
1043                                 return true;
1044                         if (anyAttr.HasValueLocal && reader.NamespaceURI == "")
1045                                 return true;
1046                         for (int i = 0; i < anyAttr.ResolvedNamespaces.Count; i++)
1047                                 if (anyAttr.ResolvedNamespaces [i] == reader.NamespaceURI)
1048                                         return true;
1049                         return false;
1050                 }
1051
1052                 private XmlSchemaObject FindAttributeDeclaration (
1053                         XmlSchemaComplexType cType,
1054                         XmlQualifiedName qname,
1055                         string elementNs)
1056                 {
1057                         XmlSchemaObject result = cType.AttributeUses [qname];
1058                         if (result != null)
1059                                 return result;
1060                         if (cType.AttributeWildcard == null)
1061                                 return null;
1062
1063                         if (!AttributeWildcardItemValid (cType.AttributeWildcard, qname))
1064                                 return null;
1065
1066                         if (cType.AttributeWildcard.ResolvedProcessContents == XmlSchemaContentProcessing.Skip)
1067                                 return cType.AttributeWildcard;
1068                         XmlSchemaAttribute attr = schemas.GlobalAttributes [qname] as XmlSchemaAttribute;
1069                         if (attr != null)
1070                                 return attr;
1071                         if (cType.AttributeWildcard.ResolvedProcessContents == XmlSchemaContentProcessing.Lax)
1072                                 return cType.AttributeWildcard;
1073                         else
1074                                 return null;
1075                 }
1076
1077                 // 3.2.4 Attribute Locally Valid and 3.4.4 - 5.wildIDs
1078                 private void AssessAttributeLocallyValid (XmlSchemaAttribute attr, bool checkWildIDs)
1079                 {
1080                         // 1.
1081                         switch (reader.NamespaceURI) {
1082                         case XmlNamespaceManager.XmlnsXml:
1083                         case XmlNamespaceManager.XmlnsXmlns:
1084                         case XmlSchema.InstanceNamespace:
1085                                 break;
1086                         }
1087                         // 2. - 4.
1088                         if (attr.AttributeType == null)
1089                                 HandleError ("Attribute type is missing for " + attr.QualifiedName);
1090                         XmlSchemaDatatype dt = attr.AttributeType as XmlSchemaDatatype;
1091                         if (dt == null)
1092                                 dt = ((XmlSchemaSimpleType) attr.AttributeType).Datatype;
1093                         // It is a bit heavy process, so let's omit as long as possible ;-)
1094                         if (dt != XmlSchemaSimpleType.AnySimpleType || attr.ValidatedFixedValue != null) {
1095                                 string normalized = dt.Normalize (reader.Value);
1096                                 object parsedValue = null;
1097                                 try {
1098                                         parsedValue = dt.ParseValue (normalized, reader.NameTable, this.ParserContext.NamespaceManager);
1099                                 } catch (Exception ex) { // FIXME: (wishlist) It is bad manner ;-(
1100                                         HandleError ("Attribute value is invalid against its data type " + dt.TokenizedType, ex);
1101                                 }
1102                                 if (attr.ValidatedFixedValue != null && attr.ValidatedFixedValue != normalized)
1103                                         HandleError ("The value of the attribute " + attr.QualifiedName + " does not match with its fixed value.");
1104                                 if (checkWildIDs)
1105                                         AssessEachAttributeIdentityConstraint (dt, normalized, parsedValue);
1106                         }
1107                 }
1108
1109                 private void AssessEachAttributeIdentityConstraint (XmlSchemaDatatype dt,
1110                         string normalized, object parsedValue)
1111                 {
1112                         // Get normalized value and (if required) parsedValue if missing.
1113                         switch (dt.TokenizedType) {
1114                         case XmlTokenizedType.IDREFS:
1115                                 if (normalized == null)
1116                                         normalized = dt.Normalize (reader.Value);
1117                                 if (parsedValue == null)
1118                                         parsedValue = dt.ParseValue (normalized, reader.NameTable, ParserContext.NamespaceManager);
1119                                 break;
1120                         case XmlTokenizedType.ID:
1121                         case XmlTokenizedType.IDREF:
1122                                 if (normalized == null)
1123                                         normalized = dt.Normalize (reader.Value);
1124                                 break;
1125                         }
1126
1127                         // Validate identity constraints.
1128                         switch (dt.TokenizedType) {
1129                         case XmlTokenizedType.ID:
1130                                 if (thisElementId != null)
1131                                         HandleError ("ID type attribute was already assigned in the containing element.");
1132                                 thisElementId = normalized;
1133                                 if (idList.Contains (normalized))
1134                                         HandleError ("Duplicate ID value was found.");
1135                                 else
1136                                         idList.Add (normalized, normalized);
1137                                 if (MissingIDReferences.Contains (normalized))
1138                                         MissingIDReferences.Remove (normalized);
1139                                 break;
1140                         case XmlTokenizedType.IDREF:
1141                                 if (!idList.Contains (normalized))
1142                                         MissingIDReferences.Add (normalized);
1143                                 break;
1144                         case XmlTokenizedType.IDREFS:
1145                                 string [] idrefs = (string []) parsedValue;
1146                                 for (int i = 0; i < idrefs.Length; i++) {
1147                                         string id = idrefs [i];
1148                                         if (!idList.Contains (id))
1149                                                 MissingIDReferences.Add (id);
1150                                 }
1151                                 break;
1152                         }
1153                 }
1154
1155                 private void AssessAttributeLocallyValidUse (XmlSchemaAttribute attr)
1156                 {
1157                         // This is extra check than spec 3.5.4
1158                         if (attr.ValidatedUse == XmlSchemaUse.Prohibited)
1159                                 HandleError ("Attribute " + attr.QualifiedName + " is prohibited in this context.");
1160                 }
1161
1162                 private void AssessEndElementSchemaValidity ()
1163                 {
1164                         if (childParticleState == null)
1165                                 childParticleState = context.ParticleState;
1166                         ValidateEndElementParticle ();  // validate against childrens' state.
1167
1168                         if (shouldValidateCharacters) {
1169                                 ValidateEndCharacters ();
1170                                 shouldValidateCharacters = false;
1171                         }
1172
1173                         // 3.3.4 Assess ElementLocallyValidElement 5: value constraints.
1174                         // 3.3.4 Assess ElementLocallyValidType 3.1.3. = StringValid(3.14.4)
1175                         // => ValidateEndCharacters().
1176
1177                         // Reset Identity constraints.
1178                         for (int i = 0; i < keyTables.Count; i++) {
1179                                 XsdKeyTable keyTable = this.keyTables [i] as XsdKeyTable;
1180                                 if (keyTable.StartDepth == reader.Depth) {
1181                                         EndIdentityValidation (keyTable);
1182                                 } else {
1183                                         for (int k = 0; k < keyTable.Entries.Count; k++) {
1184                                                 XsdKeyEntry entry = keyTable.Entries [k] as XsdKeyEntry;
1185                                                 // Remove finished (maybe key not found) entries.
1186                                                 if (entry.StartDepth == reader.Depth) {
1187                                                         if (entry.KeyFound)
1188                                                                 keyTable.FinishedEntries.Add (entry);
1189                                                         else if (entry.KeySequence.SourceSchemaIdentity is XmlSchemaKey)
1190                                                                 HandleError ("Key sequence is missing.");
1191                                                         keyTable.Entries.RemoveAt (k);
1192                                                         k--;
1193                                                 }
1194                                                 // Pop validated key depth to find two or more fields.
1195                                                 else {
1196                                                         for (int j = 0; j < entry.KeyFields.Count; j++) {
1197                                                                 XsdKeyEntryField kf = entry.KeyFields [j];
1198                                                                 if (!kf.FieldFound && kf.FieldFoundDepth == reader.Depth) {
1199                                                                         kf.FieldFoundDepth = 0;
1200                                                                         kf.FieldFoundPath = null;
1201                                                                 }
1202                                                         }
1203                                                 }
1204                                         }
1205                                 }
1206                         }
1207                         for (int i = 0; i < keyTables.Count; i++) {
1208                                 XsdKeyTable keyseq = this.keyTables [i] as XsdKeyTable;
1209                                 if (keyseq.StartDepth == reader.Depth) {
1210                                         keyTables.RemoveAt (i);
1211                                         i--;
1212                                 }
1213                         }
1214
1215                         // Reset xsi:nil, if required.
1216                         if (xsiNilDepth == reader.Depth)
1217                                 xsiNilDepth = -1;
1218                 }
1219
1220                 // 3.11.4 Identity Constraint Satisfied
1221                 private void AssessStartIdentityConstraints ()
1222                 {
1223                         if (tmpKeyrefPool != null)
1224                                 tmpKeyrefPool.Clear ();
1225                         if (context.Element != null && context.Element.Constraints.Count > 0) {
1226                                 // (a) Create new key sequences, if required.
1227                                 for (int i = 0; i < context.Element.Constraints.Count; i++) {
1228                                         XmlSchemaIdentityConstraint ident = (XmlSchemaIdentityConstraint) context.Element.Constraints [i];
1229                                         XsdKeyTable seq = CreateNewKeyTable (ident);
1230                                         if (ident is XmlSchemaKeyref) {
1231                                                 if (tmpKeyrefPool == null)
1232                                                         tmpKeyrefPool = new ArrayList ();
1233                                                 tmpKeyrefPool.Add (seq);
1234                                         }
1235                                 }
1236                         }
1237
1238                         // (b) Evaluate current key sequences.
1239                         for (int i = 0; i < keyTables.Count; i++) {
1240                                 XsdKeyTable seq  = (XsdKeyTable) keyTables [i];
1241                                 if (seq.SelectorMatches (this.elementQNameStack, reader) != null) {
1242                                         // creates and registers new entry.
1243                                         XsdKeyEntry entry = new XsdKeyEntry (seq, reader);
1244                                         seq.Entries.Add (entry);
1245                                 }
1246                         }
1247
1248                         // (c) Evaluate field paths.
1249                         for (int i = 0; i < keyTables.Count; i++) {
1250                                 XsdKeyTable seq  = (XsdKeyTable) keyTables [i];
1251                                 // If possible, create new field entry candidates.
1252                                 for (int j = 0; j < seq.Entries.Count; j++) {
1253                                         XsdKeyEntry entry = seq.Entries [j] as XsdKeyEntry;
1254                                         try {
1255                                                 entry.FieldMatches (this.elementQNameStack, this);
1256                                         } catch (Exception ex) { // FIXME: (wishlist) It is bad manner ;-(
1257                                                 HandleError ("Identity field value is invalid against its data type.", ex);
1258                                         }
1259                                 }
1260                         }
1261                 }
1262
1263                 private XsdKeyTable CreateNewKeyTable (XmlSchemaIdentityConstraint ident)
1264                 {
1265                         XsdKeyTable seq = new XsdKeyTable (ident, this);
1266                         seq.StartDepth = reader.Depth;
1267                         this.keyTables.Add (seq);
1268                         return seq;
1269                 }
1270
1271                 private void EndIdentityValidation (XsdKeyTable seq)
1272                 {
1273                         ArrayList errors = new ArrayList ();
1274                         for (int i = 0; i < seq.Entries.Count; i++) {
1275                                 XsdKeyEntry entry = (XsdKeyEntry) seq.Entries [i];
1276                                 if (entry.KeyFound)
1277                                         continue;
1278                                 if (seq.SourceSchemaIdentity is XmlSchemaKey)
1279                                         errors.Add ("line " + entry.SelectorLineNumber + "position " + entry.SelectorLinePosition);
1280                         }
1281                         if (errors.Count > 0)
1282                                 HandleError ("Invalid identity constraints were found. Key was not found. "
1283                                         + String.Join (", ", errors.ToArray (typeof (string)) as string []));
1284
1285                         errors.Clear ();
1286                         // Find reference target
1287                         XmlSchemaKeyref xsdKeyref = seq.SourceSchemaIdentity as XmlSchemaKeyref;
1288                         if (xsdKeyref != null) {
1289                                 for (int i = this.keyTables.Count - 1; i >= 0; i--) {
1290                                         XsdKeyTable target = this.keyTables [i] as XsdKeyTable;
1291                                         if (target.SourceSchemaIdentity == xsdKeyref.Target) {
1292                                                 seq.ReferencedKey = target;
1293                                                 for (int j = 0; j < seq.FinishedEntries.Count; j++) {
1294                                                         XsdKeyEntry entry = (XsdKeyEntry) seq.FinishedEntries [j];
1295                                                         for (int k = 0; k < target.FinishedEntries.Count; k++) {
1296                                                                 XsdKeyEntry targetEntry = (XsdKeyEntry) target.FinishedEntries [k];
1297                                                                 if (entry.CompareIdentity (targetEntry)) {
1298                                                                         entry.KeyRefFound = true;
1299                                                                         break;
1300                                                                 }
1301                                                         }
1302                                                 }
1303                                         }
1304                                 }
1305                                 if (seq.ReferencedKey == null)
1306                                         HandleError ("Target key was not found.");
1307                                 for (int i = 0; i < seq.FinishedEntries.Count; i++) {
1308                                         XsdKeyEntry entry = (XsdKeyEntry) seq.FinishedEntries [i];
1309                                         if (!entry.KeyRefFound)
1310                                                 errors.Add (" line " + entry.SelectorLineNumber + ", position " + entry.SelectorLinePosition);
1311                                 }
1312                                 if (errors.Count > 0)
1313                                         HandleError ("Invalid identity constraints were found. Referenced key was not found: "
1314                                                 + String.Join (" / ", errors.ToArray (typeof (string)) as string []));
1315                         }
1316                 }
1317
1318                 // Overrided Methods
1319
1320                 public override void Close ()
1321                 {
1322                         reader.Close ();
1323                 }
1324
1325                 public override string GetAttribute (int i)
1326                 {
1327                         switch (reader.NodeType) {
1328                         case XmlNodeType.XmlDeclaration:
1329                         case XmlNodeType.DocumentType:
1330                                 return reader.GetAttribute (i);
1331                         }
1332
1333                         if (reader.AttributeCount > i)
1334                                 reader.GetAttribute (i);
1335                         int defIdx = i - nonDefaultAttributeCount;
1336                         if (i < AttributeCount)
1337                                 return defaultAttributes [defIdx].DefaultValue;
1338
1339                         throw new ArgumentOutOfRangeException ("i", i, "Specified attribute index is out of range.");
1340                 }
1341
1342                 public override string GetAttribute (string name)
1343                 {
1344                         switch (reader.NodeType) {
1345                         case XmlNodeType.XmlDeclaration:
1346                         case XmlNodeType.DocumentType:
1347                                 return reader.GetAttribute (name);
1348                         }
1349
1350                         string value = reader.GetAttribute (name);
1351                         if (value != null)
1352                                 return value;
1353
1354                         XmlQualifiedName qname = SplitQName (name);
1355                         return GetDefaultAttribute (qname.Name, qname.Namespace);
1356                 }
1357
1358                 private XmlQualifiedName SplitQName (string name)
1359                 {
1360                         if (!XmlChar.IsName (name))
1361                                 throw new ArgumentException ("Invalid name was specified.", "name");
1362
1363                         Exception ex = null;
1364                         XmlQualifiedName qname = XmlSchemaUtil.ToQName (reader, name, out ex);
1365                         if (ex != null)
1366                                 return XmlQualifiedName.Empty;
1367                         else
1368                                 return qname;
1369                 }
1370
1371                 public override string GetAttribute (string localName, string ns)
1372                 {
1373                         switch (reader.NodeType) {
1374                         case XmlNodeType.XmlDeclaration:
1375                         case XmlNodeType.DocumentType:
1376                                 return reader.GetAttribute (localName, ns);
1377                         }
1378
1379                         string value = reader.GetAttribute (localName, ns);
1380                         if (value != null)
1381                                 return value;
1382
1383                         return GetDefaultAttribute (localName, ns);
1384                 }
1385
1386                 private string GetDefaultAttribute (string localName, string ns)
1387                 {
1388                         int idx = this.FindDefaultAttribute (localName, ns);
1389                         if (idx < 0)
1390                                 return null;
1391                         string value = defaultAttributes [idx].ValidatedDefaultValue;
1392                         if (value == null)
1393                                 value = defaultAttributes [idx].ValidatedFixedValue;
1394                         return value;
1395                 }
1396
1397                 private int FindDefaultAttribute (string localName, string ns)
1398                 {
1399                         for (int i = 0; i < this.defaultAttributes.Length; i++) {
1400                                 XmlSchemaAttribute attr = defaultAttributes [i];
1401                                 if (attr.QualifiedName.Name == localName &&
1402                                         (ns == null || attr.QualifiedName.Namespace == ns))
1403                                         return i;
1404                         }
1405                         return -1;
1406                 }
1407
1408                 bool IXmlLineInfo.HasLineInfo ()
1409                 {
1410                         return readerLineInfo != null && readerLineInfo.HasLineInfo ();
1411                 }
1412
1413                 public override string LookupNamespace (string prefix)
1414                 {
1415                         return reader.LookupNamespace (prefix);
1416                 }
1417
1418                 string IXmlNamespaceResolver.LookupNamespace (string prefix, bool atomizedNames)
1419                 {
1420                         IXmlNamespaceResolver res = reader as IXmlNamespaceResolver;
1421                         if (res != null)
1422                                 return res.LookupNamespace (prefix, atomizedNames);
1423                         else
1424                                 return reader.LookupNamespace (prefix);
1425                 }
1426
1427                 public override void MoveToAttribute (int i)
1428                 {
1429                         switch (reader.NodeType) {
1430                         case XmlNodeType.XmlDeclaration:
1431                         case XmlNodeType.DocumentType:
1432                                 reader.MoveToAttribute (i);
1433                                 return;
1434                         }
1435
1436                         currentQName = null;
1437                         if (i < this.nonDefaultAttributeCount) {
1438                                 reader.MoveToAttribute (i);
1439                                 this.currentDefaultAttribute = -1;
1440                                 this.defaultAttributeConsumed = false;
1441                         }
1442
1443                         if (i < AttributeCount) {
1444                                 this.currentDefaultAttribute = i - nonDefaultAttributeCount;
1445                                 this.defaultAttributeConsumed = false;
1446                         }
1447                         else
1448                                 throw new ArgumentOutOfRangeException ("i", i, "Attribute index is out of range.");
1449                 }
1450
1451                 public override bool MoveToAttribute (string name)
1452                 {
1453                         switch (reader.NodeType) {
1454                         case XmlNodeType.XmlDeclaration:
1455                         case XmlNodeType.DocumentType:
1456                                 return reader.MoveToAttribute (name);
1457                         }
1458
1459                         currentQName = null;
1460                         bool b = reader.MoveToAttribute (name);
1461                         if (b) {
1462                                 this.currentDefaultAttribute = -1;
1463                                 this.defaultAttributeConsumed = false;
1464                                 return true;
1465                         }
1466
1467                         return MoveToDefaultAttribute (name, null);
1468                 }
1469
1470                 public override bool MoveToAttribute (string localName, string ns)
1471                 {
1472                         switch (reader.NodeType) {
1473                         case XmlNodeType.XmlDeclaration:
1474                         case XmlNodeType.DocumentType:
1475                                 return reader.MoveToAttribute (localName, ns);
1476                         }
1477
1478                         currentQName = null;
1479                         bool b = reader.MoveToAttribute (localName, ns);
1480                         if (b) {
1481                                 this.currentDefaultAttribute = -1;
1482                                 this.defaultAttributeConsumed = false;
1483                                 return true;
1484                         }
1485
1486                         return MoveToDefaultAttribute (localName, ns);
1487                 }
1488
1489                 private bool MoveToDefaultAttribute (string localName, string ns)
1490                 {
1491                         int idx = this.FindDefaultAttribute (localName, ns);
1492                         if (idx < 0)
1493                                 return false;
1494                         currentDefaultAttribute = idx;
1495                         defaultAttributeConsumed = false;
1496                         return true;
1497                 }
1498
1499                 public override bool MoveToElement ()
1500                 {
1501                         currentDefaultAttribute = -1;
1502                         defaultAttributeConsumed = false;
1503                         currentQName = null;
1504                         return reader.MoveToElement ();
1505                 }
1506
1507                 public override bool MoveToFirstAttribute ()
1508                 {
1509                         switch (reader.NodeType) {
1510                         case XmlNodeType.XmlDeclaration:
1511                         case XmlNodeType.DocumentType:
1512                                 return reader.MoveToFirstAttribute ();
1513                         }
1514
1515                         currentQName = null;
1516                         if (this.nonDefaultAttributeCount > 0) {
1517                                 bool b = reader.MoveToFirstAttribute ();
1518                                 if (b) {
1519                                         currentDefaultAttribute = -1;
1520                                         defaultAttributeConsumed = false;
1521                                 }
1522                                 return b;
1523                         }
1524
1525                         if (this.defaultAttributes.Length > 0) {
1526                                 currentDefaultAttribute = 0;
1527                                 defaultAttributeConsumed = false;
1528                                 return true;
1529                         }
1530                         else
1531                                 return false;
1532                 }
1533
1534                 public override bool MoveToNextAttribute ()
1535                 {
1536                         switch (reader.NodeType) {
1537                         case XmlNodeType.XmlDeclaration:
1538                         case XmlNodeType.DocumentType:
1539                                 return reader.MoveToNextAttribute ();
1540                         }
1541
1542                         currentQName = null;
1543                         if (currentDefaultAttribute >= 0) {
1544                                 if (defaultAttributes.Length == currentDefaultAttribute + 1)
1545                                         return false;
1546                                 currentDefaultAttribute++;
1547                                 defaultAttributeConsumed = false;
1548                                 return true;
1549                         }
1550
1551                         bool b = reader.MoveToNextAttribute ();
1552                         if (b) {
1553                                 currentDefaultAttribute = -1;
1554                                 defaultAttributeConsumed = false;
1555                                 return true;
1556                         }
1557
1558                         if (defaultAttributes.Length > 0) {
1559                                 currentDefaultAttribute = 0;
1560                                 defaultAttributeConsumed = false;
1561                                 return true;
1562                         }
1563                         else
1564                                 return false;
1565                 }
1566
1567                 private void ExamineAdditionalSchema ()
1568                 {
1569                         XmlSchema schema = null;
1570                         string schemaLocation = reader.GetAttribute ("schemaLocation", XmlSchema.InstanceNamespace);
1571                         bool schemaAdded = false;
1572                         if (schemaLocation != null) {
1573                                 string [] tmp = null;
1574                                 try {
1575                                         schemaLocation = XmlSchemaDatatype.FromName ("token", XmlSchema.Namespace).Normalize (schemaLocation);
1576                                         tmp = schemaLocation.Split (XmlChar.WhitespaceChars);
1577                                 } catch (Exception ex) {
1578                                         HandleError ("Invalid schemaLocation attribute format.", ex, true);
1579                                         tmp = new string [0];
1580                                 }
1581                                 if (tmp.Length % 2 != 0)
1582                                         HandleError ("Invalid schemaLocation attribute format.");
1583                                 for (int i = 0; i < tmp.Length; i += 2) {
1584                                         Uri absUri = null;
1585                                         XmlTextReader xtr = null;
1586                                         try {
1587                                                 absUri = new Uri ((this.BaseURI != "" ? new Uri (BaseURI) : null), tmp [i + 1]);
1588                                                 xtr = new XmlTextReader (absUri.ToString (), NameTable);
1589                                                 schema = XmlSchema.Read (xtr, null);
1590                                         } catch (Exception) { // FIXME: (wishlist) It is bad manner ;-(
1591                                                 HandleError ("Could not resolve schema location URI: " + absUri, null, true);
1592                                                 continue;
1593                                         } finally {
1594                                                 if (xtr != null)
1595                                                         xtr.Close ();
1596                                         }
1597                                         if (schema.TargetNamespace == null)
1598                                                 schema.TargetNamespace = tmp [i];
1599                                         else if (schema.TargetNamespace != tmp [i])
1600                                                 HandleError ("Specified schema has different target namespace.");
1601                                 }
1602                         }
1603                         if (schema != null) {
1604                                 if (!schemas.Contains (schema.TargetNamespace)) {
1605                                         schemaAdded = true;
1606                                         schemas.Add (schema);
1607                                 }
1608                         }
1609                         schema = null;
1610                         string noNsSchemaLocation = reader.GetAttribute ("noNamespaceSchemaLocation", XmlSchema.InstanceNamespace);
1611                         if (noNsSchemaLocation != null) {
1612                                 Uri absUri = null;
1613                                 XmlTextReader xtr = null;
1614                                 try {
1615                                         absUri = new Uri ((this.BaseURI != "" ? new Uri (BaseURI) : null), noNsSchemaLocation);
1616                                         xtr = new XmlTextReader (absUri.ToString (), NameTable);
1617                                         schema = XmlSchema.Read (xtr, null);
1618                                 } catch (Exception) { // FIXME: (wishlist) It is bad manner ;-(
1619                                         HandleError ("Could not resolve schema location URI: " + absUri, null, true);
1620                                 } finally {
1621                                         if (xtr != null)
1622                                                 xtr.Close ();
1623                                 }
1624                                 if (schema != null && schema.TargetNamespace != null)
1625                                         HandleError ("Specified schema has different target namespace.");
1626                         }
1627                         if (schema != null) {
1628                                 if (!schemas.Contains (schema.TargetNamespace)) {
1629                                         schemaAdded = true;
1630                                         schemas.Add (schema);
1631                                 }
1632                         }
1633                         // FIXME: should call Reprocess()?
1634                         if (schemaAdded)
1635                                 schemas.Compile ();
1636                 }
1637
1638                 private bool HasMissingIDReferences ()
1639                 {
1640                         return missingIDReferences != null
1641                                 && missingIDReferences.Count > 0;
1642                 }
1643
1644                 public override bool Read ()
1645                 {
1646                         nonDefaultAttributeCount = 0;
1647                         currentDefaultAttribute = -1;
1648                         defaultAttributeConsumed = false;
1649                         currentQName = null;
1650                         thisElementId = null;
1651                         defaultAttributes = new XmlSchemaAttribute [0];
1652                         if (!schemas.IsCompiled)
1653                                 schemas.Compile ();
1654                         if (popContext) {
1655                                 elementQNameStack.RemoveAt (elementQNameStack.Count - 1);
1656                                 popContext = false;
1657                         }
1658
1659                         bool result = reader.Read ();
1660                         // 3.3.4 ElementLocallyValidElement 7 = Root Valid.
1661                         if (!result && HasMissingIDReferences ())
1662                                 HandleError ("There are missing ID references: " +
1663                                         String.Join (" ",
1664                                         this.missingIDReferences.ToArray (typeof (string)) as string []));
1665
1666                         switch (reader.NodeType) {
1667                         case XmlNodeType.XmlDeclaration:
1668                                 this.nonDefaultAttributeCount = reader.AttributeCount;
1669                                 break;
1670                         case XmlNodeType.Element:
1671                                 nonDefaultAttributeCount = reader.AttributeCount;
1672
1673                                 // FIXME: schemaLocation could be specified
1674                                 // at any Depth.
1675                                 if (reader.Depth == 0)
1676                                         ExamineAdditionalSchema ();
1677
1678                                 this.elementQNameStack.Add (new XmlQualifiedName (reader.LocalName, reader.NamespaceURI));
1679
1680                                 // If there is no schema information, then no validation is performed.
1681                                 if (schemas.Count == 0)
1682                                         break;
1683
1684                                 if (skipValidationDepth < 0 || reader.Depth <= skipValidationDepth) {
1685                                         if (shouldValidateCharacters) {
1686                                                 ValidateEndCharacters ();
1687                                                 shouldValidateCharacters = false;
1688                                         }
1689                                         AssessStartElementSchemaValidity ();
1690                                         storedCharacters.Length = 0;
1691                                 } else {
1692                                         context.Clear ();
1693                                 }
1694
1695                                 if (reader.IsEmptyElement)
1696                                         goto case XmlNodeType.EndElement;
1697                                 else
1698                                         shouldValidateCharacters = true;
1699                                 break;
1700                         case XmlNodeType.EndElement:
1701                                 if (reader.Depth == skipValidationDepth) {
1702                                         skipValidationDepth = -1;
1703                                         context.Clear ();
1704                                 }
1705                                 else
1706                                         AssessEndElementSchemaValidity ();
1707
1708                                 storedCharacters.Length = 0;
1709                                 childParticleState = null;
1710                                 popContext = true;
1711                                 break;
1712
1713                         case XmlNodeType.CDATA:
1714                         case XmlNodeType.SignificantWhitespace:
1715                         case XmlNodeType.Text:
1716                                 XmlSchemaComplexType ct = context.ActualType as XmlSchemaComplexType;
1717                                 if (ct != null && storedCharacters.Length > 0) {
1718                                         switch (ct.ContentType) {
1719                                         case XmlSchemaContentType.ElementOnly:
1720                                         case XmlSchemaContentType.Empty:
1721                                                 HandleError ("Not allowed character content was found.");
1722                                                 break;
1723                                         }
1724                                 }
1725
1726                                 ValidateCharacters ();
1727                                 break;
1728                         }
1729
1730                         return result;
1731                 }
1732
1733                 public override bool ReadAttributeValue ()
1734                 {
1735                         if (currentDefaultAttribute < 0)
1736                                 return reader.ReadAttributeValue ();
1737
1738                         if (this.defaultAttributeConsumed)
1739                                 return false;
1740
1741                         defaultAttributeConsumed = true;
1742                         return true;
1743                 }
1744
1745 #if NET_1_0
1746                 public override string ReadInnerXml ()
1747                 {
1748                         // MS.NET 1.0 has a serious bug here. It skips validation.
1749                         return reader.ReadInnerXml ();
1750                 }
1751
1752                 public override string ReadOuterXml ()
1753                 {
1754                         // MS.NET 1.0 has a serious bug here. It skips validation.
1755                         return reader.ReadOuterXml ();
1756                 }
1757 #endif
1758
1759                 // XmlReader.ReadString() should call derived this.Read().
1760                 public override string ReadString ()
1761                 {
1762 #if NET_1_0
1763                         return reader.ReadString ();
1764 #else
1765                         return base.ReadString ();
1766 #endif
1767                 }
1768
1769                 // This class itself does not have this feature.
1770                 public override void ResolveEntity ()
1771                 {
1772                         reader.ResolveEntity ();
1773                 }
1774
1775                 internal class XsdValidationContext
1776                 {
1777                         Hashtable contextStack;
1778
1779                         public XsdValidationContext ()
1780                         {
1781                                 contextStack = new Hashtable ();
1782                         }
1783
1784                         // Some of them might be missing (See the spec section 5.3, and also 3.3.4).
1785                         public XmlSchemaElement Element;
1786                         public XsdValidationState ParticleState;
1787                         public XmlSchemaAttribute [] DefaultAttributes;
1788
1789                         // Some of them might be missing (See the spec section 5.3).
1790                         public object SchemaType;
1791
1792                         public object LocalTypeDefinition;
1793
1794                         public object ActualType {
1795                                 get {
1796                                         if (LocalTypeDefinition != null)
1797                                                 return LocalTypeDefinition;
1798                                         else
1799                                                 return SchemaType;
1800                                 }
1801                         }
1802
1803                         public void Clear ()
1804                         {
1805                                 Element = null;
1806                                 SchemaType = null;
1807                                 ParticleState = null;
1808                                 LocalTypeDefinition = null;
1809                         }
1810
1811                         public void PushScope (int depth)
1812                         {
1813                                 contextStack [depth] = this.MemberwiseClone ();
1814                         }
1815
1816                         public void PopScope (int depth)
1817                         {
1818                                 Load (depth);
1819                                 contextStack.Remove (depth + 1);
1820                         }
1821
1822                         public void Load (int depth)
1823                         {
1824                                 Clear ();
1825                                 XsdValidationContext restored = (XsdValidationContext) contextStack [depth];
1826                                 if (restored != null) {
1827                                         this.Element = restored.Element;
1828                                         this.ParticleState = restored.ParticleState;
1829                                         this.SchemaType = restored.SchemaType;
1830                                         this.LocalTypeDefinition = restored.LocalTypeDefinition;
1831                                 }
1832                         }
1833                 }
1834         }
1835
1836 }