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                 XmlQualifiedName qnameXmlLang = new XmlQualifiedName ("lang", XmlNamespaceManager.XmlnsXml);
 446
 447                 public override string XmlLang {
 448                         get {
 449                                 string xmlLang = reader.XmlLang;
 450                                 if (xmlLang != null)
 451                                         return xmlLang;
 452                                 int idx = this.FindDefaultAttribute ("lang", XmlNamespaceManager.XmlnsXml);
 453                                 if (idx < 0)
 454                                         return null;
 455                                 xmlLang = defaultAttributes [idx].ValidatedDefaultValue;
 456                                 if (xmlLang == null)
 457                                         xmlLang = defaultAttributes [idx].ValidatedFixedValue;
 458                                 return xmlLang;
 459                         }
 460                 }
 461
 462                 public override XmlSpace XmlSpace {
 463                         get {
 464                                 XmlSpace space = reader.XmlSpace;
 465                                 if (space != XmlSpace.None)
 466                                         return space;
 467                                 int idx = this.FindDefaultAttribute ("space", XmlNamespaceManager.XmlnsXml);
 468                                 if (idx < 0)
 469                                         return XmlSpace.None;
 470                                 string spaceSpec = defaultAttributes [idx].ValidatedDefaultValue;
 471                                 if (spaceSpec == null)
 472                                         spaceSpec = defaultAttributes [idx].ValidatedFixedValue;
 473                                 return (XmlSpace) Enum.Parse (typeof (XmlSpace), spaceSpec, false);
 474                         }
 475                 }
 476
 477                 // Private Methods
 478
 479                 private XmlQualifiedName QualifyName (string name)
 480                 {
 481                         return XmlQualifiedName.Parse (name, this);
 482                 }
 483
 484                 private void HandleError (string error)
 485                 {
 486                         HandleError (error, null);
 487                 }
 488
 489                 private void HandleError (string error, Exception innerException)
 490                 {
 491                         HandleError (error, innerException, false);
 492                 }
 493
 494                 private void HandleError (string error, Exception innerException, bool isWarning)
 495                 {
 496                         if (reportNoValidationError)    // extra quick check
 497                                 return;
 498
 499                         XmlSchemaException schemaException = new XmlSchemaException (error,
 500                                         this, this.BaseURI, null, innerException);
 501                         HandleError (schemaException, isWarning);
 502                 }
 503
 504                 private void HandleError (XmlSchemaException schemaException)
 505                 {
 506                         HandleError (schemaException, false);
 507                 }
 508
 509                 private void HandleError (XmlSchemaException schemaException, bool isWarning)
 510                 {
 511                         if (reportNoValidationError)
 512                                 return;
 513
 514                         ValidationEventArgs e = new ValidationEventArgs (schemaException,
 515                                 schemaException.Message, isWarning ? XmlSeverityType.Warning : XmlSeverityType.Error);
 516
 517                         if (this.ValidationEventHandler != null)
 518                                 this.ValidationEventHandler (this, e);
 519                         else if (xvReader != null)
 520                                 xvReader.OnValidationEvent (this, e);
 521                         else if (e.Severity == XmlSeverityType.Error)
 522 #if NON_MONO_ENV
 523                                 this.xvReader.OnValidationEvent (this, e);
 524 #else
 525                                 throw e.Exception;
 526 #endif
 527                 }
 528
 529                 private XmlSchemaElement FindElement (string name, string ns)
 530                 {
 531                         return (XmlSchemaElement) schemas.GlobalElements [new XmlQualifiedName (name, ns)];
 532                 }
 533
 534                 private XmlSchemaType FindType (XmlQualifiedName qname)
 535                 {
 536                         return (XmlSchemaType) schemas.GlobalTypes [qname];
 537                 }
 538
 539                 private void ValidateStartElementParticle ()
 540                 {
 541                         stateManager.CurrentElement = null;
 542                         context.ParticleState = context.ParticleState.EvaluateStartElement (reader.LocalName, reader.NamespaceURI);
 543                         if (context.ParticleState == XsdValidationState.Invalid)
 544                                 HandleError ("Invalid start element: " + reader.NamespaceURI + ":" + reader.LocalName);
 545
 546                         context.Element = stateManager.CurrentElement;
 547                         if (context.Element != null)
 548                                 context.SchemaType = context.Element.ElementType;
 549                 }
 550
 551                 private void ValidateEndElementParticle ()
 552                 {
 553                         if (childParticleState != null) {
 554                                 if (!childParticleState.EvaluateEndElement ()) {
 555                                         HandleError ("Invalid end element: " + reader.Name);
 556                                 }
 557                         }
 558                         context.PopScope (reader.Depth);
 559                 }
 560
 561                 // Utility for missing validation completion related to child items.
 562                 private void ValidateCharacters ()
 563                 {
 564                         if (xsiNilDepth >= 0 && xsiNilDepth < reader.Depth)
 565                                 HandleError ("Element item appeared, while current element context is nil.");
 566
 567                         storedCharacters.Append (reader.Value);
 568                 }
 569
 570                 // Utility for missing validation completion related to child items.
 571                 private void ValidateEndCharacters ()
 572                 {
 573                         if (context.ActualType == null)
 574                                 return;
 575
 576                         string value = storedCharacters.ToString ();
 577
 578                         if (storedCharacters.Length == 0) {
 579                                 // 3.3.4 Element Locally Valid (Element) 5.1.2
 580                                 if (context.Element != null) {
 581                                         if (context.Element.ValidatedDefaultValue != null)
 582                                                 value = context.Element.ValidatedDefaultValue;
 583                                 }
 584                         }
 585
 586                         XmlSchemaDatatype dt = context.ActualType as XmlSchemaDatatype;
 587                         XmlSchemaSimpleType st = context.ActualType as XmlSchemaSimpleType;
 588                         if (dt == null) {
 589                                 if (st != null) {
 590                                         dt = st.Datatype;
 591                                 } else {
 592                                         XmlSchemaComplexType ct = context.ActualType as XmlSchemaComplexType;
 593                                         dt = ct.Datatype;
 594                                         switch (ct.ContentType) {
 595                                         case XmlSchemaContentType.ElementOnly:
 596                                         case XmlSchemaContentType.Empty:
 597                                                 if (storedCharacters.Length > 0)
 598                                                         HandleError ("Character content not allowed.");
 599                                                 break;
 600                                         }
 601                                 }
 602                         }
 603                         if (dt != null) {
 604                                 // 3.3.4 Element Locally Valid (Element) :: 5.2.2.2. Fixed value constraints
 605                                 if (context.Element != null && context.Element.ValidatedFixedValue != null)
 606                                         if (value != context.Element.ValidatedFixedValue)
 607                                                 HandleError ("Fixed value constraint was not satisfied.");
 608                                 AssessStringValid (st, dt, value);
 609                         }
 610
 611                         // Identity field value
 612                         if (currentKeyFieldConsumers != null) {
 613                                 while (this.currentKeyFieldConsumers.Count > 0) {
 614                                         XsdKeyEntryField field = this.currentKeyFieldConsumers [0] as XsdKeyEntryField;
 615                                         if (field.Identity != null)
 616                                                 HandleError ("Two or more identical field was found. Former value is '" + field.Identity + "' .");
 617                                         object identity = null; // This means empty value
 618                                         if (dt != null) {
 619                                                 try {
 620                                                         identity = dt.ParseValue (value, NameTable, ParserContext.NamespaceManager);
 621                                                 } catch (Exception ex) { // FIXME: (wishlist) This is bad manner ;-(
 622                                                         HandleError ("Identity value is invalid against its data type " + dt.TokenizedType, ex);
 623                                                 }
 624                                         }
 625                                         if (identity == null)
 626                                                 identity = value;
 627
 628                                         if (!field.SetIdentityField (identity, reader.Depth == xsiNilDepth, dt as XsdAnySimpleType, this))
 629                                                 HandleError ("Two or more identical key value was found: '" + value + "' .");
 630                                         this.currentKeyFieldConsumers.RemoveAt (0);
 631                                 }
 632                         }
 633
 634                         shouldValidateCharacters = false;
 635                 }
 636
 637                 // 3.14.4 String Valid
 638                 private void AssessStringValid (XmlSchemaSimpleType st,
 639                         XmlSchemaDatatype dt, string value)
 640                 {
 641                         XmlSchemaDatatype validatedDatatype = dt;
 642                         if (st != null) {
 643                                 string normalized = validatedDatatype.Normalize (value);
 644                                 string [] values;
 645                                 XmlSchemaDatatype itemDatatype;
 646                                 XmlSchemaSimpleType itemSimpleType;
 647                                 switch (st.DerivedBy) {
 648                                 case XmlSchemaDerivationMethod.List:
 649                                         XmlSchemaSimpleTypeList listContent = st.Content as XmlSchemaSimpleTypeList;
 650                                         values = normalized.Split (wsChars);
 651                                         itemDatatype = listContent.ValidatedListItemType as XmlSchemaDatatype;
 652                                         itemSimpleType = listContent.ValidatedListItemType as XmlSchemaSimpleType;
 653                                         for (int vi = 0; vi < values.Length; vi++) {
 654                                                 string each = values [vi];
 655                                                 if (each == String.Empty)
 656                                                         continue;
 657                                                 // validate against ValidatedItemType
 658                                                 if (itemDatatype != null) {
 659                                                         try {
 660                                                                 itemDatatype.ParseValue (each, NameTable, ParserContext.NamespaceManager);
 661                                                         } catch (Exception ex) { // FIXME: (wishlist) better exception handling ;-(
 662                                                                 HandleError ("List type value contains one or more invalid values.", ex);
 663                                                                 break;
 664                                                         }
 665                                                 }
 666                                                 else
 667                                                         AssessStringValid (itemSimpleType, itemSimpleType.Datatype, each);
 668                                         }
 669                                         break;
 670                                 case XmlSchemaDerivationMethod.Union:
 671                                         XmlSchemaSimpleTypeUnion union = st.Content as XmlSchemaSimpleTypeUnion;
 672                                         {
 673                                                 string each = normalized;
 674                                                 // validate against ValidatedItemType
 675                                                 bool passed = false;
 676                                                 foreach (object eachType in union.ValidatedTypes) {
 677                                                         itemDatatype = eachType as XmlSchemaDatatype;
 678                                                         itemSimpleType = eachType as XmlSchemaSimpleType;
 679                                                         if (itemDatatype != null) {
 680                                                                 try {
 681                                                                         itemDatatype.ParseValue (each, NameTable, ParserContext.NamespaceManager);
 682                                                                 } catch (Exception) { // FIXME: (wishlist) better exception handling ;-(
 683                                                                         continue;
 684                                                                 }
 685                                                         }
 686                                                         else {
 687                                                                 try {
 688                                                                         AssessStringValid (itemSimpleType, itemSimpleType.Datatype, each);
 689                                                                 } catch (XmlSchemaException) {
 690                                                                         continue;
 691                                                                 }
 692                                                         }
 693                                                         passed = true;
 694                                                         break;
 695                                                 }
 696                                                 if (!passed) {
 697                                                         HandleError ("Union type value contains one or more invalid values.");
 698                                                         break;
 699                                                 }
 700                                         }
 701                                         break;
 702                                 case XmlSchemaDerivationMethod.Restriction:
 703                                         XmlSchemaSimpleTypeRestriction str = st.Content as XmlSchemaSimpleTypeRestriction;
 704                                         // facet validation
 705                                         if (str != null) {
 706                                                 /* Don't forget to validate against inherited type's facets
 707                                                  * Could we simplify this by assuming that the basetype will also
 708                                                  * be restriction?
 709                                                  * */
 710                                                  // mmm, will check later.
 711                                                 XmlSchemaSimpleType baseType = st.BaseXmlSchemaType as XmlSchemaSimpleType;
 712                                                 if (baseType != null) {
 713                                                          AssessStringValid(baseType, dt, normalized);
 714                                                 }
 715                                                 if (!str.ValidateValueWithFacets (normalized, NameTable)) {
 716                                                         HandleError ("Specified value was invalid against the facets.");
 717                                                         break;
 718                                                 }
 719                                         }
 720                                         validatedDatatype = st.Datatype;
 721                                         break;
 722                                 }
 723                         }
 724                         if (validatedDatatype != null) {
 725                                 try {
 726                                         validatedDatatype.ParseValue (value, NameTable, ParserContext.NamespaceManager);
 727                                 } catch (Exception ex) {        // FIXME: (wishlist) It is bad manner ;-(
 728                                         HandleError ("Invalidly typed data was specified.", ex);
 729                                 }
 730                         }
 731                 }
 732
 733                 private object GetLocalTypeDefinition (string name)
 734                 {
 735                         object xsiType = null;
 736                         XmlQualifiedName typeQName = QualifyName (name);
 737                         if (typeQName == XmlSchemaComplexType.AnyTypeName)
 738                                 xsiType = XmlSchemaComplexType.AnyType;
 739                         else if (XmlSchemaUtil.IsBuiltInDatatypeName (typeQName))
 740                                 xsiType = XmlSchemaDatatype.FromName (typeQName);
 741                         else
 742                                 xsiType = FindType (typeQName);
 743                         return xsiType;
 744                 }
 745
 746                 // It is common to ElementLocallyValid::4 and SchemaValidityAssessment::1.2.1.2.4
 747                 private void AssessLocalTypeDerivationOK (object xsiType, object baseType, XmlSchemaDerivationMethod flag)
 748                 {
 749                         XmlSchemaType xsiSchemaType = xsiType as XmlSchemaType;
 750                         XmlSchemaComplexType baseComplexType = baseType as XmlSchemaComplexType;
 751                         XmlSchemaComplexType xsiComplexType = xsiSchemaType as XmlSchemaComplexType;
 752                         if (xsiType != baseType) {
 753                                 // Extracted (not extraneous) check for 3.4.6 TypeDerivationOK.
 754                                 if (baseComplexType != null)
 755                                         flag |= baseComplexType.BlockResolved;
 756                                 if (flag == XmlSchemaDerivationMethod.All) {
 757                                         HandleError ("Prohibited element type substitution.");
 758                                         return;
 759                                 } else if (xsiSchemaType != null && (flag & xsiSchemaType.DerivedBy) != 0) {
 760                                         HandleError ("Prohibited element type substitution.");
 761                                         return;
 762                                 }
 763                         }
 764
 765                         if (xsiComplexType != null)
 766                                 try {
 767                                         xsiComplexType.ValidateTypeDerivationOK (baseType, null, null);
 768                                 } catch (XmlSchemaException ex) {
 769 //                                      HandleError ("Locally specified schema complex type derivation failed. " + ex.Message, ex);
 770                                         HandleError (ex);
 771                                 }
 772                         else {
 773                                 XmlSchemaSimpleType xsiSimpleType = xsiType as XmlSchemaSimpleType;
 774                                 if (xsiSimpleType != null) {
 775                                         try {
 776                                                 xsiSimpleType.ValidateTypeDerivationOK (baseType, null, null, true);
 777                                         } catch (XmlSchemaException ex) {
 778 //                                              HandleError ("Locally specified schema simple type derivation failed. " + ex.Message, ex);
 779                                                 HandleError (ex);
 780                                         }
 781                                 }
 782                                 else if (xsiType is XmlSchemaDatatype) {
 783                                         // do nothing
 784                                 }
 785                                 else
 786                                         HandleError ("Primitive data type cannot be derived type using xsi:type specification.");
 787                         }
 788                 }
 789
 790                 // Section 3.3.4 of the spec.
 791                 private void AssessStartElementSchemaValidity ()
 792                 {
 793                         // If the reader is inside xsi:nil (and failed on validation),
 794                         // then simply skip its content.
 795                         if (xsiNilDepth >= 0 && xsiNilDepth < reader.Depth)
 796                                 HandleError ("Element item appeared, while current element context is nil.");
 797
 798                         context.Load (reader.Depth);
 799                         if (childParticleState != null) {
 800                                 context.ParticleState = childParticleState;
 801                                 childParticleState = null;
 802                         }
 803
 804                         // If validation state exists, then first assess particle validity.
 805                         context.SchemaType = null;
 806                         if (context.ParticleState != null) {
 807                                 ValidateStartElementParticle ();
 808                         }
 809
 810                         string xsiNilValue = reader.GetAttribute ("nil", XmlSchema.InstanceNamespace);
 811                         if (xsiNilValue != null)
 812                                 xsiNilValue = xsiNilValue.Trim (XmlChar.WhitespaceChars);
 813                         bool isXsiNil = xsiNilValue == "true";
 814                         if (isXsiNil && this.xsiNilDepth < 0)
 815                                 xsiNilDepth = reader.Depth;
 816
 817                         // [Schema Validity Assessment (Element) 1.2]
 818                         // Evaluate "local type definition" from xsi:type.
 819                         // (See spec 3.3.4 Schema Validity Assessment (Element) 1.2.1.2.3.
 820                         // Note that Schema Validity Assessment(Element) 1.2 takes
 821                         // precedence than 1.1 of that.
 822
 823                         string xsiTypeName = reader.GetAttribute ("type", XmlSchema.InstanceNamespace);
 824                         if (xsiTypeName != null) {
 825                                 xsiTypeName = xsiTypeName.Trim (XmlChar.WhitespaceChars);
 826                                 object xsiType = GetLocalTypeDefinition (xsiTypeName);
 827                                 if (xsiType == null)
 828                                         HandleError ("The instance type was not found: " + xsiTypeName + " .");
 829                                 else {
 830                                         XmlSchemaType xsiSchemaType = xsiType as XmlSchemaType;
 831                                         if (xsiSchemaType != null && this.context.Element != null) {
 832                                                 XmlSchemaType elemBaseType = context.Element.ElementType as XmlSchemaType;
 833                                                 if (elemBaseType != null && (xsiSchemaType.DerivedBy & elemBaseType.FinalResolved) != 0)
 834                                                         HandleError ("The instance type is prohibited by the type of the context element.");
 835                                                 if (elemBaseType != xsiType && (xsiSchemaType.DerivedBy & this.context.Element.BlockResolved) != 0)
 836                                                         HandleError ("The instance type is prohibited by the context element.");
 837                                         }
 838                                         XmlSchemaComplexType xsiComplexType = xsiType as XmlSchemaComplexType;
 839                                         if (xsiComplexType != null && xsiComplexType.IsAbstract)
 840                                                 HandleError ("The instance type is abstract: " + xsiTypeName + " .");
 841                                         else {
 842                                                 // If current schema type exists, then this xsi:type must be
 843                                                 // valid extension of that type. See 1.2.1.2.4.
 844                                                 if (context.Element != null) {
 845                                                         AssessLocalTypeDerivationOK (xsiType, context.Element.ElementType, context.Element.BlockResolved);
 846                                                 }
 847                                                 AssessStartElementLocallyValidType (xsiType);   // 1.2.2:
 848                                                 context.LocalTypeDefinition = xsiType;
 849                                         }
 850                                 }
 851                         }
 852                         else
 853                                 context.LocalTypeDefinition = null;
 854
 855                         // Create Validation Root, if not exist.
 856                         // [Schema Validity Assessment (Element) 1.1]
 857                         if (context.Element == null)
 858                                 context.Element = FindElement (reader.LocalName, reader.NamespaceURI);
 859                         if (context.Element != null) {
 860                                 if (xsiTypeName == null) {
 861                                         context.SchemaType = context.Element.ElementType;
 862                                         AssessElementLocallyValidElement (context.Element, xsiNilValue);        // 1.1.2
 863                                 }
 864                         } else {
 865                                 XmlSchema schema;
 866                                 switch (stateManager.ProcessContents) {
 867                                 case XmlSchemaContentProcessing.Skip:
 868                                         break;
 869                                 case XmlSchemaContentProcessing.Lax:
 870                                         /*
 871                                         schema = schemas [reader.NamespaceURI];
 872                                         if (schema != null && !schema.missedSubComponents)
 873                                                 HandleError ("Element declaration for " + reader.LocalName + " is missing.");
 874                                         */
 875                                         break;
 876                                 default:
 877                                         if (xsiTypeName == null &&
 878                                                 (schemas.Contains (reader.NamespaceURI) ||
 879                                                 !schemas.MissedSubComponents (reader.NamespaceURI)))
 880                                                 HandleError ("Element declaration for " + reader.LocalName + " is missing.");
 881                                         break;
 882                                 }
 883                         }
 884
 885                         if (stateManager.ProcessContents == XmlSchemaContentProcessing.Skip)
 886                                 skipValidationDepth = reader.Depth;
 887
 888                         // Finally, create child particle state.
 889                         XmlSchemaComplexType xsComplexType = SchemaType as XmlSchemaComplexType;
 890                         if (xsComplexType != null)
 891                                 childParticleState = stateManager.Create (xsComplexType.ValidatableParticle);
 892                         else if (stateManager.ProcessContents == XmlSchemaContentProcessing.Lax)
 893                                 childParticleState = stateManager.Create (XmlSchemaAny.AnyTypeContent);
 894                         else
 895                                 childParticleState = stateManager.Create (XmlSchemaParticle.Empty);
 896
 897                         AssessStartIdentityConstraints ();
 898
 899                         context.PushScope (reader.Depth);
 900                 }
 901
 902                 // 3.3.4 Element Locally Valid (Element)
 903                 private void AssessElementLocallyValidElement (XmlSchemaElement element, string xsiNilValue)
 904                 {
 905                         XmlQualifiedName qname = new XmlQualifiedName (reader.LocalName, reader.NamespaceURI);
 906                         // 1.
 907                         if (element == null)
 908                                 HandleError ("Element declaration is required for " + qname);
 909                         // 2.
 910                         if (element.ActualIsAbstract)
 911                                 HandleError ("Abstract element declaration was specified for " + qname);
 912                         // 3.1.
 913                         if (!element.ActualIsNillable && xsiNilValue != null)
 914                                 HandleError ("This element declaration is not nillable: " + qname);
 915                         // 3.2.
 916                         // Note that 3.2.1 xsi:nil constraints are to be validated in
 917                         else if (xsiNilValue == "true") {
 918                                 // AssessElementSchemaValidity() and ValidateCharacters()
 919
 920                                 if (element.ValidatedFixedValue != null)
 921                                         HandleError ("Schema instance nil was specified, where the element declaration for " + qname + "has fixed value constraints.");
 922                         }
 923                         // 4.
 924                         string xsiType = reader.GetAttribute ("type", XmlSchema.InstanceNamespace);
 925                         if (xsiType != null) {
 926                                 context.LocalTypeDefinition = GetLocalTypeDefinition (xsiType);
 927                                 AssessLocalTypeDerivationOK (context.LocalTypeDefinition, element.ElementType, element.BlockResolved);
 928                         }
 929                         else
 930                                 context.LocalTypeDefinition = null;
 931
 932                         // 5 Not all things cannot be assessed here.
 933                         // It is common to 5.1 and 5.2
 934                         if (element.ElementType != null)
 935                                 AssessStartElementLocallyValidType (SchemaType);
 936
 937                         // 6. should be out from here.
 938                         // See invokation of AssessStartIdentityConstraints().
 939
 940                         // 7 is going to be validated in Read() (in case of xmlreader's EOF).
 941                 }
 942
 943                 // 3.3.4 Element Locally Valid (Type)
 944                 private void AssessStartElementLocallyValidType (object schemaType)
 945                 {
 946                         if (schemaType == null) {       // 1.
 947                                 HandleError ("Schema type does not exist.");
 948                                 return;
 949                         }
 950                         XmlSchemaComplexType cType = schemaType as XmlSchemaComplexType;
 951                         XmlSchemaSimpleType sType = schemaType as XmlSchemaSimpleType;
 952                         if (sType != null) {
 953                                 // 3.1.1.
 954                                 while (reader.MoveToNextAttribute ()) {
 955                                         if (reader.NamespaceURI == XmlNamespaceManager.XmlnsXmlns)
 956                                                 continue;
 957                                         if (reader.NamespaceURI != XmlSchema.InstanceNamespace)
 958                                                 HandleError ("Current simple type cannot accept attributes other than schema instance namespace.");
 959                                         switch (reader.LocalName) {
 960                                         case "type":
 961                                         case "nil":
 962                                         case "schemaLocation":
 963                                         case "noNamespaceSchemaLocation":
 964                                                 break;
 965                                         default:
 966                                                 HandleError ("Unknown schema instance namespace attribute: " + reader.LocalName);
 967                                                 break;
 968                                         }
 969                                 }
 970                                 reader.MoveToElement ();
 971                                 // 3.1.2 and 3.1.3 cannot be assessed here.
 972                         } else if (cType != null) {
 973                                 if (cType.IsAbstract) { // 2.
 974                                         HandleError ("Target complex type is abstract.");
 975                                         return;
 976                                 }
 977                                 // 3.2
 978                                 AssessElementLocallyValidComplexType (cType);
 979                         }
 980                 }
 981
 982                 // 3.4.4 Element Locally Valid (Complex Type)
 983                 private void AssessElementLocallyValidComplexType (XmlSchemaComplexType cType)
 984                 {
 985                         // 1.
 986                         if (cType.IsAbstract)
 987                                 HandleError ("Target complex type is abstract.");
 988
 989                         // 2 (xsi:nil and content prohibition)
 990                         // See AssessStartElementSchemaValidity() and ValidateCharacters()
 991
 992                         string elementNs = reader.NamespaceURI;
 993                         // 3. attribute uses and
 994                         // 5. wild IDs
 995                         while (reader.MoveToNextAttribute ()) {
 996                                 if (reader.NamespaceURI == "http://www.w3.org/2000/xmlns/")
 997                                         continue;
 998                                 else if (reader.NamespaceURI == XmlSchema.InstanceNamespace)
 999                                         continue;
1000                                 XmlQualifiedName qname = new XmlQualifiedName (reader.LocalName, reader.NamespaceURI);
1001                                 XmlSchemaObject attMatch = FindAttributeDeclaration (cType, qname, elementNs);
1002                                 if (attMatch == null)
1003                                         HandleError ("Attribute declaration was not found for " + qname);
1004                                 else {
1005                                         XmlSchemaAttribute attdecl = attMatch as XmlSchemaAttribute;
1006                                         if (attdecl == null) { // i.e. anyAttribute
1007                                                 XmlSchemaAnyAttribute anyAttrMatch = attMatch as XmlSchemaAnyAttribute;
1008                                         } else {
1009                                                 AssessAttributeLocallyValidUse (attdecl);
1010                                                 AssessAttributeLocallyValid (attdecl, true);
1011                                         }
1012                                 }
1013                         }
1014                         reader.MoveToElement ();
1015
1016                         // Collect default attributes.
1017                         // 4.
1018                         foreach (DictionaryEntry entry in cType.AttributeUses) {
1019                                 XmlSchemaAttribute attr = (XmlSchemaAttribute) entry.Value;
1020                                 if (reader [attr.QualifiedName.Name, attr.QualifiedName.Namespace] == null) {
1021                                         if (attr.ValidatedUse == XmlSchemaUse.Required &&
1022                                                 attr.ValidatedFixedValue == null)
1023                                                 HandleError ("Required attribute " + attr.QualifiedName + " was not found.");
1024                                         else if (attr.ValidatedDefaultValue != null)
1025                                                 DefaultAttributesCache.Add (attr);
1026                                         else if (attr.ValidatedFixedValue != null)
1027                                                 DefaultAttributesCache.Add (attr);
1028                                 }
1029                         }
1030                         defaultAttributes = (XmlSchemaAttribute [])
1031                                 DefaultAttributesCache.ToArray (typeof (XmlSchemaAttribute));
1032                         context.DefaultAttributes = defaultAttributes;
1033                         if (defaultAttributesCache != null)
1034                                 defaultAttributesCache.Clear ();
1035                         // 5. wild IDs was already checked above.
1036                 }
1037
1038                 // Spec 3.10.4 Item Valid (Wildcard)
1039                 private bool AttributeWildcardItemValid (XmlSchemaAnyAttribute anyAttr, XmlQualifiedName qname)
1040                 {
1041                         if (anyAttr.HasValueAny)
1042                                 return true;
1043                         if (anyAttr.HasValueOther && (anyAttr.TargetNamespace == "" || reader.NamespaceURI != anyAttr.TargetNamespace))
1044                                 return true;
1045                         if (anyAttr.HasValueTargetNamespace && reader.NamespaceURI == anyAttr.TargetNamespace)
1046                                 return true;
1047                         if (anyAttr.HasValueLocal && reader.NamespaceURI == "")
1048                                 return true;
1049                         for (int i = 0; i < anyAttr.ResolvedNamespaces.Count; i++)
1050                                 if (anyAttr.ResolvedNamespaces [i] == reader.NamespaceURI)
1051                                         return true;
1052                         return false;
1053                 }
1054
1055                 private XmlSchemaObject FindAttributeDeclaration (
1056                         XmlSchemaComplexType cType,
1057                         XmlQualifiedName qname,
1058                         string elementNs)
1059                 {
1060                         XmlSchemaObject result = cType.AttributeUses [qname];
1061                         if (result != null)
1062                                 return result;
1063                         if (cType.AttributeWildcard == null)
1064                                 return null;
1065
1066                         if (!AttributeWildcardItemValid (cType.AttributeWildcard, qname))
1067                                 return null;
1068
1069                         if (cType.AttributeWildcard.ResolvedProcessContents == XmlSchemaContentProcessing.Skip)
1070                                 return cType.AttributeWildcard;
1071                         XmlSchemaAttribute attr = schemas.GlobalAttributes [qname] as XmlSchemaAttribute;
1072                         if (attr != null)
1073                                 return attr;
1074                         if (cType.AttributeWildcard.ResolvedProcessContents == XmlSchemaContentProcessing.Lax)
1075                                 return cType.AttributeWildcard;
1076                         else
1077                                 return null;
1078                 }
1079
1080                 // 3.2.4 Attribute Locally Valid and 3.4.4 - 5.wildIDs
1081                 private void AssessAttributeLocallyValid (XmlSchemaAttribute attr, bool checkWildIDs)
1082                 {
1083                         // 1.
1084                         switch (reader.NamespaceURI) {
1085                         case XmlNamespaceManager.XmlnsXml:
1086                         case XmlNamespaceManager.XmlnsXmlns:
1087                         case XmlSchema.InstanceNamespace:
1088                                 break;
1089                         }
1090                         // 2. - 4.
1091                         if (attr.AttributeType == null)
1092                                 HandleError ("Attribute type is missing for " + attr.QualifiedName);
1093                         XmlSchemaDatatype dt = attr.AttributeType as XmlSchemaDatatype;
1094                         if (dt == null)
1095                                 dt = ((XmlSchemaSimpleType) attr.AttributeType).Datatype;
1096                         // It is a bit heavy process, so let's omit as long as possible ;-)
1097                         if (dt != XmlSchemaSimpleType.AnySimpleType || attr.ValidatedFixedValue != null) {
1098                                 string normalized = dt.Normalize (reader.Value);
1099                                 object parsedValue = null;
1100                                 try {
1101                                         parsedValue = dt.ParseValue (normalized, reader.NameTable, this.ParserContext.NamespaceManager);
1102                                 } catch (Exception ex) { // FIXME: (wishlist) It is bad manner ;-(
1103                                         HandleError ("Attribute value is invalid against its data type " + dt.TokenizedType, ex);
1104                                 }
1105                                 if (attr.ValidatedFixedValue != null && attr.ValidatedFixedValue != normalized)
1106                                         HandleError ("The value of the attribute " + attr.QualifiedName + " does not match with its fixed value.");
1107                                 if (checkWildIDs)
1108                                         AssessEachAttributeIdentityConstraint (dt, normalized, parsedValue);
1109                         }
1110                 }
1111
1112                 private void AssessEachAttributeIdentityConstraint (XmlSchemaDatatype dt,
1113                         string normalized, object parsedValue)
1114                 {
1115                         // Get normalized value and (if required) parsedValue if missing.
1116                         switch (dt.TokenizedType) {
1117                         case XmlTokenizedType.IDREFS:
1118                                 if (normalized == null)
1119                                         normalized = dt.Normalize (reader.Value);
1120                                 if (parsedValue == null)
1121                                         parsedValue = dt.ParseValue (normalized, reader.NameTable, ParserContext.NamespaceManager);
1122                                 break;
1123                         case XmlTokenizedType.ID:
1124                         case XmlTokenizedType.IDREF:
1125                                 if (normalized == null)
1126                                         normalized = dt.Normalize (reader.Value);
1127                                 break;
1128                         }
1129
1130                         // Validate identity constraints.
1131                         switch (dt.TokenizedType) {
1132                         case XmlTokenizedType.ID:
1133                                 if (thisElementId != null)
1134                                         HandleError ("ID type attribute was already assigned in the containing element.");
1135                                 thisElementId = normalized;
1136                                 if (idList.Contains (normalized))
1137                                         HandleError ("Duplicate ID value was found.");
1138                                 else
1139                                         idList.Add (normalized, normalized);
1140                                 if (MissingIDReferences.Contains (normalized))
1141                                         MissingIDReferences.Remove (normalized);
1142                                 break;
1143                         case XmlTokenizedType.IDREF:
1144                                 if (!idList.Contains (normalized))
1145                                         MissingIDReferences.Add (normalized);
1146                                 break;
1147                         case XmlTokenizedType.IDREFS:
1148                                 string [] idrefs = (string []) parsedValue;
1149                                 for (int i = 0; i < idrefs.Length; i++) {
1150                                         string id = idrefs [i];
1151                                         if (!idList.Contains (id))
1152                                                 MissingIDReferences.Add (id);
1153                                 }
1154                                 break;
1155                         }
1156                 }
1157
1158                 private void AssessAttributeLocallyValidUse (XmlSchemaAttribute attr)
1159                 {
1160                         // This is extra check than spec 3.5.4
1161                         if (attr.ValidatedUse == XmlSchemaUse.Prohibited)
1162                                 HandleError ("Attribute " + attr.QualifiedName + " is prohibited in this context.");
1163                 }
1164
1165                 private void AssessEndElementSchemaValidity ()
1166                 {
1167                         if (childParticleState == null)
1168                                 childParticleState = context.ParticleState;
1169                         ValidateEndElementParticle ();  // validate against childrens' state.
1170
1171                         if (shouldValidateCharacters) {
1172                                 ValidateEndCharacters ();
1173                                 shouldValidateCharacters = false;
1174                         }
1175
1176                         // 3.3.4 Assess ElementLocallyValidElement 5: value constraints.
1177                         // 3.3.4 Assess ElementLocallyValidType 3.1.3. = StringValid(3.14.4)
1178                         // => ValidateEndCharacters().
1179
1180                         // Reset Identity constraints.
1181                         for (int i = 0; i < keyTables.Count; i++) {
1182                                 XsdKeyTable keyTable = this.keyTables [i] as XsdKeyTable;
1183                                 if (keyTable.StartDepth == reader.Depth) {
1184                                         EndIdentityValidation (keyTable);
1185                                 } else {
1186                                         for (int k = 0; k < keyTable.Entries.Count; k++) {
1187                                                 XsdKeyEntry entry = keyTable.Entries [k] as XsdKeyEntry;
1188                                                 // Remove finished (maybe key not found) entries.
1189                                                 if (entry.StartDepth == reader.Depth) {
1190                                                         if (entry.KeyFound)
1191                                                                 keyTable.FinishedEntries.Add (entry);
1192                                                         else if (entry.KeySequence.SourceSchemaIdentity is XmlSchemaKey)
1193                                                                 HandleError ("Key sequence is missing.");
1194                                                         keyTable.Entries.RemoveAt (k);
1195                                                         k--;
1196                                                 }
1197                                                 // Pop validated key depth to find two or more fields.
1198                                                 else {
1199                                                         for (int j = 0; j < entry.KeyFields.Count; j++) {
1200                                                                 XsdKeyEntryField kf = entry.KeyFields [j];
1201                                                                 if (!kf.FieldFound && kf.FieldFoundDepth == reader.Depth) {
1202                                                                         kf.FieldFoundDepth = 0;
1203                                                                         kf.FieldFoundPath = null;
1204                                                                 }
1205                                                         }
1206                                                 }
1207                                         }
1208                                 }
1209                         }
1210                         for (int i = 0; i < keyTables.Count; i++) {
1211                                 XsdKeyTable keyseq = this.keyTables [i] as XsdKeyTable;
1212                                 if (keyseq.StartDepth == reader.Depth) {
1213                                         keyTables.RemoveAt (i);
1214                                         i--;
1215                                 }
1216                         }
1217
1218                         // Reset xsi:nil, if required.
1219                         if (xsiNilDepth == reader.Depth)
1220                                 xsiNilDepth = -1;
1221                 }
1222
1223                 // 3.11.4 Identity Constraint Satisfied
1224                 private void AssessStartIdentityConstraints ()
1225                 {
1226                         if (tmpKeyrefPool != null)
1227                                 tmpKeyrefPool.Clear ();
1228                         if (context.Element != null && context.Element.Constraints.Count > 0) {
1229                                 // (a) Create new key sequences, if required.
1230                                 for (int i = 0; i < context.Element.Constraints.Count; i++) {
1231                                         XmlSchemaIdentityConstraint ident = (XmlSchemaIdentityConstraint) context.Element.Constraints [i];
1232                                         XsdKeyTable seq = CreateNewKeyTable (ident);
1233                                         if (ident is XmlSchemaKeyref) {
1234                                                 if (tmpKeyrefPool == null)
1235                                                         tmpKeyrefPool = new ArrayList ();
1236                                                 tmpKeyrefPool.Add (seq);
1237                                         }
1238                                 }
1239                         }
1240
1241                         // (b) Evaluate current key sequences.
1242                         for (int i = 0; i < keyTables.Count; i++) {
1243                                 XsdKeyTable seq  = (XsdKeyTable) keyTables [i];
1244                                 if (seq.SelectorMatches (this.elementQNameStack, reader) != null) {
1245                                         // creates and registers new entry.
1246                                         XsdKeyEntry entry = new XsdKeyEntry (seq, reader);
1247                                         seq.Entries.Add (entry);
1248                                 }
1249                         }
1250
1251                         // (c) Evaluate field paths.
1252                         for (int i = 0; i < keyTables.Count; i++) {
1253                                 XsdKeyTable seq  = (XsdKeyTable) keyTables [i];
1254                                 // If possible, create new field entry candidates.
1255                                 for (int j = 0; j < seq.Entries.Count; j++) {
1256                                         XsdKeyEntry entry = seq.Entries [j] as XsdKeyEntry;
1257                                         try {
1258                                                 entry.FieldMatches (this.elementQNameStack, this);
1259                                         } catch (Exception ex) { // FIXME: (wishlist) It is bad manner ;-(
1260                                                 HandleError ("Identity field value is invalid against its data type.", ex);
1261                                         }
1262                                 }
1263                         }
1264                 }
1265
1266                 private XsdKeyTable CreateNewKeyTable (XmlSchemaIdentityConstraint ident)
1267                 {
1268                         XsdKeyTable seq = new XsdKeyTable (ident, this);
1269                         seq.StartDepth = reader.Depth;
1270                         XmlSchemaKeyref keyref = ident as XmlSchemaKeyref;
1271                         this.keyTables.Add (seq);
1272                         return seq;
1273                 }
1274
1275                 private void EndIdentityValidation (XsdKeyTable seq)
1276                 {
1277                         ArrayList errors = new ArrayList ();
1278                         for (int i = 0; i < seq.Entries.Count; i++) {
1279                                 XsdKeyEntry entry = (XsdKeyEntry) seq.Entries [i];
1280                                 if (entry.KeyFound)
1281                                         continue;
1282                                 if (seq.SourceSchemaIdentity is XmlSchemaKey)
1283                                         errors.Add ("line " + entry.SelectorLineNumber + "position " + entry.SelectorLinePosition);
1284                         }
1285                         if (errors.Count > 0)
1286                                 HandleError ("Invalid identity constraints were found. Key was not found. "
1287                                         + String.Join (", ", errors.ToArray (typeof (string)) as string []));
1288
1289                         errors.Clear ();
1290                         // Find reference target
1291                         XmlSchemaKeyref xsdKeyref = seq.SourceSchemaIdentity as XmlSchemaKeyref;
1292                         if (xsdKeyref != null) {
1293                                 for (int i = this.keyTables.Count - 1; i >= 0; i--) {
1294                                         XsdKeyTable target = this.keyTables [i] as XsdKeyTable;
1295                                         if (target.SourceSchemaIdentity == xsdKeyref.Target) {
1296                                                 seq.ReferencedKey = target;
1297                                                 for (int j = 0; j < seq.FinishedEntries.Count; j++) {
1298                                                         XsdKeyEntry entry = (XsdKeyEntry) seq.FinishedEntries [j];
1299                                                         for (int k = 0; k < target.FinishedEntries.Count; k++) {
1300                                                                 XsdKeyEntry targetEntry = (XsdKeyEntry) target.FinishedEntries [k];
1301                                                                 if (entry.CompareIdentity (targetEntry)) {
1302                                                                         entry.KeyRefFound = true;
1303                                                                         break;
1304                                                                 }
1305                                                         }
1306                                                 }
1307                                         }
1308                                 }
1309                                 if (seq.ReferencedKey == null)
1310                                         HandleError ("Target key was not found.");
1311                                 for (int i = 0; i < seq.FinishedEntries.Count; i++) {
1312                                         XsdKeyEntry entry = (XsdKeyEntry) seq.FinishedEntries [i];
1313                                         if (!entry.KeyRefFound)
1314                                                 errors.Add (" line " + entry.SelectorLineNumber + ", position " + entry.SelectorLinePosition);
1315                                 }
1316                                 if (errors.Count > 0)
1317                                         HandleError ("Invalid identity constraints were found. Referenced key was not found: "
1318                                                 + String.Join (" / ", errors.ToArray (typeof (string)) as string []));
1319                         }
1320                 }
1321
1322                 // Overrided Methods
1323
1324                 public override void Close ()
1325                 {
1326                         reader.Close ();
1327                 }
1328
1329                 public override string GetAttribute (int i)
1330                 {
1331                         switch (reader.NodeType) {
1332                         case XmlNodeType.XmlDeclaration:
1333                         case XmlNodeType.DocumentType:
1334                                 return reader.GetAttribute (i);
1335                         }
1336
1337                         if (reader.AttributeCount > i)
1338                                 reader.GetAttribute (i);
1339                         int defIdx = i - nonDefaultAttributeCount;
1340                         if (i < AttributeCount)
1341                                 return defaultAttributes [defIdx].DefaultValue;
1342
1343                         throw new ArgumentOutOfRangeException ("i", i, "Specified attribute index is out of range.");
1344                 }
1345
1346                 public override string GetAttribute (string name)
1347                 {
1348                         switch (reader.NodeType) {
1349                         case XmlNodeType.XmlDeclaration:
1350                         case XmlNodeType.DocumentType:
1351                                 return reader.GetAttribute (name);
1352                         }
1353
1354                         string value = reader.GetAttribute (name);
1355                         if (value != null)
1356                                 return value;
1357
1358                         XmlQualifiedName qname = SplitQName (name);
1359                         return GetDefaultAttribute (qname.Name, qname.Namespace);
1360                 }
1361
1362                 private XmlQualifiedName SplitQName (string name)
1363                 {
1364                         if (!XmlChar.IsName (name))
1365                                 throw new ArgumentException ("Invalid name was specified.", "name");
1366
1367                         Exception ex = null;
1368                         XmlQualifiedName qname = XmlSchemaUtil.ToQName (reader, name, out ex);
1369                         if (ex != null)
1370                                 return XmlQualifiedName.Empty;
1371                         else
1372                                 return qname;
1373                 }
1374
1375                 public override string GetAttribute (string localName, string ns)
1376                 {
1377                         switch (reader.NodeType) {
1378                         case XmlNodeType.XmlDeclaration:
1379                         case XmlNodeType.DocumentType:
1380                                 return reader.GetAttribute (localName, ns);
1381                         }
1382
1383                         string value = reader.GetAttribute (localName, ns);
1384                         if (value != null)
1385                                 return value;
1386
1387                         return GetDefaultAttribute (localName, ns);
1388                 }
1389
1390                 private string GetDefaultAttribute (string localName, string ns)
1391                 {
1392                         int idx = this.FindDefaultAttribute (localName, ns);
1393                         if (idx < 0)
1394                                 return null;
1395                         string value = defaultAttributes [idx].ValidatedDefaultValue;
1396                         if (value == null)
1397                                 value = defaultAttributes [idx].ValidatedFixedValue;
1398                         return value;
1399                 }
1400
1401                 private int FindDefaultAttribute (string localName, string ns)
1402                 {
1403                         for (int i = 0; i < this.defaultAttributes.Length; i++) {
1404                                 XmlSchemaAttribute attr = defaultAttributes [i];
1405                                 if (attr.QualifiedName.Name == localName &&
1406                                         (ns == null || attr.QualifiedName.Namespace == ns))
1407                                         return i;
1408                         }
1409                         return -1;
1410                 }
1411
1412                 bool IXmlLineInfo.HasLineInfo ()
1413                 {
1414                         return readerLineInfo != null && readerLineInfo.HasLineInfo ();
1415                 }
1416
1417                 public override string LookupNamespace (string prefix)
1418                 {
1419                         return reader.LookupNamespace (prefix);
1420                 }
1421
1422                 string IXmlNamespaceResolver.LookupNamespace (string prefix, bool atomizedNames)
1423                 {
1424                         IXmlNamespaceResolver res = reader as IXmlNamespaceResolver;
1425                         if (res != null)
1426                                 return res.LookupNamespace (prefix, atomizedNames);
1427                         else
1428                                 return reader.LookupNamespace (prefix);
1429                 }
1430
1431                 public override void MoveToAttribute (int i)
1432                 {
1433                         switch (reader.NodeType) {
1434                         case XmlNodeType.XmlDeclaration:
1435                         case XmlNodeType.DocumentType:
1436                                 reader.MoveToAttribute (i);
1437                                 return;
1438                         }
1439
1440                         currentQName = null;
1441                         if (i < this.nonDefaultAttributeCount) {
1442                                 reader.MoveToAttribute (i);
1443                                 this.currentDefaultAttribute = -1;
1444                                 this.defaultAttributeConsumed = false;
1445                         }
1446
1447                         if (i < AttributeCount) {
1448                                 this.currentDefaultAttribute = i - nonDefaultAttributeCount;
1449                                 this.defaultAttributeConsumed = false;
1450                         }
1451                         else
1452                                 throw new ArgumentOutOfRangeException ("i", i, "Attribute index is out of range.");
1453                 }
1454
1455                 public override bool MoveToAttribute (string name)
1456                 {
1457                         switch (reader.NodeType) {
1458                         case XmlNodeType.XmlDeclaration:
1459                         case XmlNodeType.DocumentType:
1460                                 return reader.MoveToAttribute (name);
1461                         }
1462
1463                         currentQName = null;
1464                         bool b = reader.MoveToAttribute (name);
1465                         if (b) {
1466                                 this.currentDefaultAttribute = -1;
1467                                 this.defaultAttributeConsumed = false;
1468                                 return true;
1469                         }
1470
1471                         return MoveToDefaultAttribute (name, null);
1472                 }
1473
1474                 public override bool MoveToAttribute (string localName, string ns)
1475                 {
1476                         switch (reader.NodeType) {
1477                         case XmlNodeType.XmlDeclaration:
1478                         case XmlNodeType.DocumentType:
1479                                 return reader.MoveToAttribute (localName, ns);
1480                         }
1481
1482                         currentQName = null;
1483                         bool b = reader.MoveToAttribute (localName, ns);
1484                         if (b) {
1485                                 this.currentDefaultAttribute = -1;
1486                                 this.defaultAttributeConsumed = false;
1487                                 return true;
1488                         }
1489
1490                         return MoveToDefaultAttribute (localName, ns);
1491                 }
1492
1493                 private bool MoveToDefaultAttribute (string localName, string ns)
1494                 {
1495                         int idx = this.FindDefaultAttribute (localName, ns);
1496                         if (idx < 0)
1497                                 return false;
1498                         currentDefaultAttribute = idx;
1499                         defaultAttributeConsumed = false;
1500                         return true;
1501                 }
1502
1503                 public override bool MoveToElement ()
1504                 {
1505                         currentDefaultAttribute = -1;
1506                         defaultAttributeConsumed = false;
1507                         currentQName = null;
1508                         return reader.MoveToElement ();
1509                 }
1510
1511                 public override bool MoveToFirstAttribute ()
1512                 {
1513                         switch (reader.NodeType) {
1514                         case XmlNodeType.XmlDeclaration:
1515                         case XmlNodeType.DocumentType:
1516                                 return reader.MoveToFirstAttribute ();
1517                         }
1518
1519                         currentQName = null;
1520                         if (this.nonDefaultAttributeCount > 0) {
1521                                 bool b = reader.MoveToFirstAttribute ();
1522                                 if (b) {
1523                                         currentDefaultAttribute = -1;
1524                                         defaultAttributeConsumed = false;
1525                                 }
1526                                 return b;
1527                         }
1528
1529                         if (this.defaultAttributes.Length > 0) {
1530                                 currentDefaultAttribute = 0;
1531                                 defaultAttributeConsumed = false;
1532                                 return true;
1533                         }
1534                         else
1535                                 return false;
1536                 }
1537
1538                 public override bool MoveToNextAttribute ()
1539                 {
1540                         switch (reader.NodeType) {
1541                         case XmlNodeType.XmlDeclaration:
1542                         case XmlNodeType.DocumentType:
1543                                 return reader.MoveToNextAttribute ();
1544                         }
1545
1546                         currentQName = null;
1547                         if (currentDefaultAttribute >= 0) {
1548                                 if (defaultAttributes.Length == currentDefaultAttribute + 1)
1549                                         return false;
1550                                 currentDefaultAttribute++;
1551                                 defaultAttributeConsumed = false;
1552                                 return true;
1553                         }
1554
1555                         bool b = reader.MoveToNextAttribute ();
1556                         if (b) {
1557                                 currentDefaultAttribute = -1;
1558                                 defaultAttributeConsumed = false;
1559                                 return true;
1560                         }
1561
1562                         if (defaultAttributes.Length > 0) {
1563                                 currentDefaultAttribute = 0;
1564                                 defaultAttributeConsumed = false;
1565                                 return true;
1566                         }
1567                         else
1568                                 return false;
1569                 }
1570
1571                 private void ExamineAdditionalSchema ()
1572                 {
1573                         XmlSchema schema = null;
1574                         string schemaLocation = reader.GetAttribute ("schemaLocation", XmlSchema.InstanceNamespace);
1575                         bool schemaAdded = false;
1576                         if (schemaLocation != null) {
1577                                 string [] tmp = null;
1578                                 try {
1579                                         schemaLocation = XmlSchemaDatatype.FromName ("token", XmlSchema.Namespace).Normalize (schemaLocation);
1580                                         tmp = schemaLocation.Split (XmlChar.WhitespaceChars);
1581                                 } catch (Exception ex) {
1582                                         HandleError ("Invalid schemaLocation attribute format.", ex, true);
1583                                         tmp = new string [0];
1584                                 }
1585                                 if (tmp.Length % 2 != 0)
1586                                         HandleError ("Invalid schemaLocation attribute format.");
1587                                 for (int i = 0; i < tmp.Length; i += 2) {
1588                                         Uri absUri = null;
1589                                         XmlTextReader xtr = null;
1590                                         try {
1591                                                 absUri = new Uri ((this.BaseURI != "" ? new Uri (BaseURI) : null), tmp [i + 1]);
1592                                                 xtr = new XmlTextReader (absUri.ToString (), NameTable);
1593                                                 schema = XmlSchema.Read (xtr, null);
1594                                         } catch (Exception) { // FIXME: (wishlist) It is bad manner ;-(
1595                                                 HandleError ("Could not resolve schema location URI: " + absUri, null, true);
1596                                                 continue;
1597                                         } finally {
1598                                                 if (xtr != null)
1599                                                         xtr.Close ();
1600                                         }
1601                                         if (schema.TargetNamespace == null)
1602                                                 schema.TargetNamespace = tmp [i];
1603                                         else if (schema.TargetNamespace != tmp [i])
1604                                                 HandleError ("Specified schema has different target namespace.");
1605                                 }
1606                         }
1607                         if (schema != null) {
1608                                 if (!schemas.Contains (schema.TargetNamespace)) {
1609                                         schemaAdded = true;
1610                                         schemas.Add (schema);
1611                                 }
1612                         }
1613                         schema = null;
1614                         string noNsSchemaLocation = reader.GetAttribute ("noNamespaceSchemaLocation", XmlSchema.InstanceNamespace);
1615                         if (noNsSchemaLocation != null) {
1616                                 Uri absUri = null;
1617                                 XmlTextReader xtr = null;
1618                                 try {
1619                                         absUri = new Uri ((this.BaseURI != "" ? new Uri (BaseURI) : null), noNsSchemaLocation);
1620                                         xtr = new XmlTextReader (absUri.ToString (), NameTable);
1621                                         schema = XmlSchema.Read (xtr, null);
1622                                 } catch (Exception) { // FIXME: (wishlist) It is bad manner ;-(
1623                                         HandleError ("Could not resolve schema location URI: " + absUri, null, true);
1624                                 } finally {
1625                                         if (xtr != null)
1626                                                 xtr.Close ();
1627                                 }
1628                                 if (schema != null && schema.TargetNamespace != null)
1629                                         HandleError ("Specified schema has different target namespace.");
1630                         }
1631                         if (schema != null) {
1632                                 if (!schemas.Contains (schema.TargetNamespace)) {
1633                                         schemaAdded = true;
1634                                         schemas.Add (schema);
1635                                 }
1636                         }
1637                         // FIXME: should call Reprocess()?
1638                         if (schemaAdded)
1639                                 schemas.Compile ();
1640                 }
1641
1642                 private bool HasMissingIDReferences ()
1643                 {
1644                         return missingIDReferences != null
1645                                 && missingIDReferences.Count > 0;
1646                 }
1647
1648                 public override bool Read ()
1649                 {
1650                         nonDefaultAttributeCount = 0;
1651                         currentDefaultAttribute = -1;
1652                         defaultAttributeConsumed = false;
1653                         currentQName = null;
1654                         thisElementId = null;
1655                         defaultAttributes = new XmlSchemaAttribute [0];
1656                         if (popContext) {
1657                                 elementQNameStack.RemoveAt (elementQNameStack.Count - 1);
1658                                 popContext = false;
1659                         }
1660
1661                         bool result = reader.Read ();
1662                         // 3.3.4 ElementLocallyValidElement 7 = Root Valid.
1663                         if (!result && HasMissingIDReferences ())
1664                                 HandleError ("There are missing ID references: " +
1665                                         String.Join (" ",
1666                                         this.missingIDReferences.ToArray (typeof (string)) as string []));
1667
1668                         switch (reader.NodeType) {
1669                         case XmlNodeType.XmlDeclaration:
1670                                 this.nonDefaultAttributeCount = reader.AttributeCount;
1671                                 break;
1672                         case XmlNodeType.Element:
1673                                 nonDefaultAttributeCount = reader.AttributeCount;
1674
1675                                 // FIXME: schemaLocation could be specified
1676                                 // at any Depth.
1677                                 if (reader.Depth == 0)
1678                                         ExamineAdditionalSchema ();
1679
1680                                 this.elementQNameStack.Add (new XmlQualifiedName (reader.LocalName, reader.NamespaceURI));
1681
1682                                 // If there is no schema information, then no validation is performed.
1683                                 if (schemas.Count == 0)
1684                                         break;
1685
1686                                 if (skipValidationDepth < 0 || reader.Depth <= skipValidationDepth) {
1687                                         if (shouldValidateCharacters) {
1688                                                 ValidateEndCharacters ();
1689                                                 shouldValidateCharacters = false;
1690                                         }
1691                                         AssessStartElementSchemaValidity ();
1692                                         storedCharacters.Length = 0;
1693                                 } else {
1694                                         context.Clear ();
1695                                 }
1696
1697                                 if (reader.IsEmptyElement)
1698                                         goto case XmlNodeType.EndElement;
1699                                 else
1700                                         shouldValidateCharacters = true;
1701                                 break;
1702                         case XmlNodeType.EndElement:
1703                                 if (reader.Depth == skipValidationDepth) {
1704                                         skipValidationDepth = -1;
1705                                         context.Clear ();
1706                                 }
1707                                 else
1708                                         AssessEndElementSchemaValidity ();
1709
1710                                 storedCharacters.Length = 0;
1711                                 childParticleState = null;
1712                                 popContext = true;
1713                                 break;
1714
1715                         case XmlNodeType.CDATA:
1716                         case XmlNodeType.SignificantWhitespace:
1717                         case XmlNodeType.Text:
1718                                 XmlSchemaComplexType ct = context.ActualType as XmlSchemaComplexType;
1719                                 if (ct != null && storedCharacters.Length > 0) {
1720                                         switch (ct.ContentType) {
1721                                         case XmlSchemaContentType.ElementOnly:
1722                                         case XmlSchemaContentType.Empty:
1723                                                 HandleError ("Not allowed character content was found.");
1724                                                 break;
1725                                         }
1726                                 }
1727
1728                                 ValidateCharacters ();
1729                                 break;
1730                         }
1731
1732                         return result;
1733                 }
1734
1735                 public override bool ReadAttributeValue ()
1736                 {
1737                         if (currentDefaultAttribute < 0)
1738                                 return reader.ReadAttributeValue ();
1739
1740                         if (this.defaultAttributeConsumed)
1741                                 return false;
1742
1743                         defaultAttributeConsumed = true;
1744                         return true;
1745                 }
1746
1747 #if NET_1_0
1748                 public override string ReadInnerXml ()
1749                 {
1750                         // MS.NET 1.0 has a serious bug here. It skips validation.
1751                         return reader.ReadInnerXml ();
1752                 }
1753
1754                 public override string ReadOuterXml ()
1755                 {
1756                         // MS.NET 1.0 has a serious bug here. It skips validation.
1757                         return reader.ReadOuterXml ();
1758                 }
1759 #endif
1760
1761                 // XmlReader.ReadString() should call derived this.Read().
1762                 public override string ReadString ()
1763                 {
1764 #if NET_1_0
1765                         return reader.ReadString ();
1766 #else
1767                         return base.ReadString ();
1768 #endif
1769                 }
1770
1771                 // This class itself does not have this feature.
1772                 public override void ResolveEntity ()
1773                 {
1774                         reader.ResolveEntity ();
1775                 }
1776
1777                 internal class XsdValidationContext
1778                 {
1779                         Hashtable contextStack;
1780
1781                         public XsdValidationContext ()
1782                         {
1783                                 contextStack = new Hashtable ();
1784                         }
1785
1786                         // Some of them might be missing (See the spec section 5.3, and also 3.3.4).
1787                         public XmlSchemaElement Element;
1788                         public XsdValidationState ParticleState;
1789                         public XmlSchemaAttribute [] DefaultAttributes;
1790
1791                         // Some of them might be missing (See the spec section 5.3).
1792                         public object SchemaType;
1793
1794                         public object LocalTypeDefinition;
1795
1796                         public object ActualType {
1797                                 get {
1798                                         if (LocalTypeDefinition != null)
1799                                                 return LocalTypeDefinition;
1800                                         else
1801                                                 return SchemaType;
1802                                 }
1803                         }
1804
1805                         public void Clear ()
1806                         {
1807                                 Element = null;
1808                                 SchemaType = null;
1809                                 ParticleState = null;
1810                                 LocalTypeDefinition = null;
1811                         }
1812
1813                         public void PushScope (int depth)
1814                         {
1815                                 contextStack [depth] = this.MemberwiseClone ();
1816                         }
1817
1818                         public void PopScope (int depth)
1819                         {
1820                                 Load (depth);
1821                                 contextStack.Remove (depth + 1);
1822                         }
1823
1824                         public void Load (int depth)
1825                         {
1826                                 Clear ();
1827                                 XsdValidationContext restored = (XsdValidationContext) contextStack [depth];
1828                                 if (restored != null) {
1829                                         this.Element = restored.Element;
1830                                         this.ParticleState = restored.ParticleState;
1831                                         this.SchemaType = restored.SchemaType;
1832                                         this.LocalTypeDefinition = restored.LocalTypeDefinition;
1833                                 }
1834                         }
1835                 }
1836         }
1837
1838 }