dtdvalidator.cs source code in C# .NET

Source code for the .NET framework in C#

                        

Code:

/ Net / Net / 3.5.50727.3053 / DEVDIV / depot / DevDiv / releases / whidbey / netfxsp / ndp / fx / src / Xml / System / Xml / schema / dtdvalidator.cs / 1 / dtdvalidator.cs

                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// [....] 
//-----------------------------------------------------------------------------
 
namespace System.Xml.Schema { 
    using System;
    using System.Collections; 
    using System.Text;
    using System.IO;
    using System.Net;
    using System.Diagnostics; 
    using System.Xml.Schema;
    using System.Xml.XPath; 
 
#pragma warning disable 618
 
    internal sealed class DtdValidator : BaseValidator {

        //required by ParseValue
        class NamespaceManager : XmlNamespaceManager { 
            public override string LookupNamespace(string prefix) { return prefix; }
        } 
 
        static NamespaceManager namespaceManager = new NamespaceManager();
        const int        STACK_INCREMENT = 10; 
        HWStack          validationStack;  // validaton contexts
        Hashtable        attPresence;
        XmlQualifiedName name = XmlQualifiedName.Empty;
        Hashtable        IDs; 
        IdRefNode        idRefListHead;
        bool             processIdentityConstraints; 
 
        internal DtdValidator(XmlValidatingReaderImpl reader, ValidationEventHandler eventHandler, bool processIdentityConstraints)  : base(reader, null, eventHandler) {
            this.processIdentityConstraints = processIdentityConstraints; 
            Init();
        }

        private void Init() { 
            Debug.Assert(reader != null);
            validationStack = new HWStack(STACK_INCREMENT); 
            textValue = new StringBuilder(); 
            name = XmlQualifiedName.Empty;
            attPresence = new Hashtable(); 
            schemaInfo = new SchemaInfo();
            checkDatatype = false;
            Push(name);
        } 

        public override void Validate() { 
            if (schemaInfo.SchemaType == SchemaType.DTD) { 
                switch (reader.NodeType) {
                        case XmlNodeType.Element: 
                            ValidateElement();
                            if (reader.IsEmptyElement) {
                                goto case XmlNodeType.EndElement;
                            } 
                            break;
                        case XmlNodeType.Whitespace: 
                        case XmlNodeType.SignificantWhitespace: 
                            if (MeetsStandAloneConstraint()) {
                                ValidateWhitespace(); 
                            }
                            break;
                        case XmlNodeType.ProcessingInstruction:
                        case XmlNodeType.Comment: 
                            ValidatePIComment();
                            break; 
 
                        case XmlNodeType.Text:          // text inside a node
                        case XmlNodeType.CDATA:         //  
                            ValidateText();
                            break;
                        case XmlNodeType.EntityReference:
                            if (!GenEntity( new XmlQualifiedName(reader.LocalName, reader.Prefix) ) ){ 
                                ValidateText();
                            } 
                            break; 
                        case XmlNodeType.EndElement:
                            ValidateEndElement(); 
                            break;
                }
            }
             else { 
                if(reader.Depth == 0 &&
                    reader.NodeType == XmlNodeType.Element) { 
                    SendValidationEvent(Res.Xml_NoDTDPresent, this.name.ToString(), XmlSeverityType.Warning); 
                }
            } 
        }

        private bool MeetsStandAloneConstraint() {
            if (reader.StandAlone &&                  // VC 1 - iv 
                 context.ElementDecl != null &&
                 context.ElementDecl.IsDeclaredInExternal && 
                 context.ElementDecl.ContentValidator.ContentType == XmlSchemaContentType.ElementOnly) { 
                 SendValidationEvent(Res.Sch_StandAlone);
                 return false; 
            }
            return true;
        }
 
        private void ValidatePIComment() {
            // When validating with a dtd, empty elements should be lexically empty. 
            if (context.NeedValidateChildren ) { 
                if (context.ElementDecl.ContentValidator == ContentValidator.Empty) {
                    SendValidationEvent(Res.Sch_InvalidPIComment); 
                }

            }
        } 

        private void ValidateElement() { 
            elementName.Init(reader.LocalName, reader.Prefix); 
            if ( (reader.Depth == 0) &&
                  (!schemaInfo.DocTypeName.IsEmpty) && 
                  (!schemaInfo.DocTypeName.Equals(elementName)) ){ //VC 1
                    SendValidationEvent(Res.Sch_RootMatchDocType);
                }
            else { 
                ValidateChildElement();
            } 
            ProcessElement(); 
        }
 
        private void ValidateChildElement() {
            Debug.Assert(reader.NodeType == XmlNodeType.Element);
            if (context.NeedValidateChildren) { //i think i can get away with removing this if cond since won't make this call for documentelement
                int errorCode = 0; 
                context.ElementDecl.ContentValidator.ValidateElement(elementName, context, out errorCode);
                if (errorCode < 0) { 
                    XmlSchemaValidator.ElementValidationError(elementName, context, EventHandler, reader, reader.BaseURI, PositionInfo.LineNumber, PositionInfo.LinePosition, false); 
                }
            } 
        }

        private void ValidateStartElement() {
            if (context.ElementDecl != null) { 
                Reader.SchemaTypeObject =  context.ElementDecl.SchemaType;
 
                if (Reader.IsEmptyElement  && context.ElementDecl.DefaultValueTyped != null) { 
                   Reader.TypedValueObject = context.ElementDecl.DefaultValueTyped;
                   context.IsNill = true; // reusing IsNill - what is this flag later used for?? 
                }
                if ( context.ElementDecl.HasRequiredAttribute ) {
                    attPresence.Clear();
                } 
            }
 
            if (Reader.MoveToFirstAttribute()) { 
                do {
                    try { 
                        reader.SchemaTypeObject = null;
                        SchemaAttDef attnDef = context.ElementDecl.GetAttDef( new XmlQualifiedName( reader.LocalName, reader.Prefix) );
                        if (attnDef != null) {
                            if (context.ElementDecl != null && context.ElementDecl.HasRequiredAttribute) { 
                                attPresence.Add(attnDef.Name, attnDef);
                            } 
                            Reader.SchemaTypeObject = attnDef.SchemaType; 

                            if (attnDef.Datatype != null && !reader.IsDefault) { //Since XmlTextReader adds default attributes, do not check again 
                                // set typed value
                                CheckValue(Reader.Value, attnDef);
                            }
                        } 
                        else {
                            SendValidationEvent(Res.Sch_UndeclaredAttribute, reader.Name); 
                        } 
                    }
                    catch (XmlSchemaException e) { 
                        e.SetSource(Reader.BaseURI, PositionInfo.LineNumber, PositionInfo.LinePosition);
                        SendValidationEvent(e);
                    }
                } while(Reader.MoveToNextAttribute()); 
                Reader.MoveToElement();
            } 
 
        }
 
        private void ValidateEndStartElement() {
            if (context.ElementDecl.HasRequiredAttribute) {
                try {
                    context.ElementDecl.CheckAttributes(attPresence, Reader.StandAlone); 
                }
                catch (XmlSchemaException e) { 
                    e.SetSource(Reader.BaseURI, PositionInfo.LineNumber, PositionInfo.LinePosition); 
                    SendValidationEvent(e);
                } 
            }

            if (context.ElementDecl.Datatype != null) {
                checkDatatype = true; 
                hasSibling = false;
                textString = string.Empty; 
                textValue.Length = 0; 
            }
        } 

        private void ProcessElement() {
            SchemaElementDecl elementDecl = schemaInfo.GetElementDecl(elementName);
            Push(elementName); 
            if (elementDecl != null) {
                context.ElementDecl = elementDecl; 
                ValidateStartElement(); 
                ValidateEndStartElement();
                context.NeedValidateChildren = true; 
                elementDecl.ContentValidator.InitValidation( context );
            }
            else {
                SendValidationEvent(Res.Sch_UndeclaredElement, XmlSchemaValidator.QNameString(context.LocalName, context.Namespace)); 
                context.ElementDecl = null;
            } 
        } 

        public override void CompleteValidation() { 
            if (schemaInfo.SchemaType == SchemaType.DTD) {
                do {
                    ValidateEndElement();
                } while (Pop()); 
                CheckForwardRefs();
            } 
        } 

        private void ValidateEndElement() { 
            if (context.ElementDecl != null) {
                if (context.NeedValidateChildren) {
                    if(!context.ElementDecl.ContentValidator.CompleteValidation(context)) {
                        XmlSchemaValidator.CompleteValidationError(context, EventHandler, reader, reader.BaseURI, PositionInfo.LineNumber, PositionInfo.LinePosition, false); 
                    }
                } 
 
                if (checkDatatype) {
                    string stringValue = !hasSibling ? textString : textValue.ToString();  // only for identity-constraint exception reporting 
                    CheckValue(stringValue, null);
                    checkDatatype = false;
                    textValue.Length = 0; // cleanup
                    textString = string.Empty; 
                }
            } 
            Pop(); 

        } 

        public override bool PreserveWhitespace {
            get { return context.ElementDecl != null ? context.ElementDecl.ContentValidator.PreserveWhitespace : false; }
        } 

 
        void ProcessTokenizedType( 
            XmlTokenizedType    ttype,
            string              name 
        ) {
            switch(ttype) {
            case XmlTokenizedType.ID:
                if (processIdentityConstraints) { 
                    if (FindId(name) != null) {
                        SendValidationEvent(Res.Sch_DupId, name); 
                    } 
                    else {
                        AddID(name, context.LocalName); 
                    }
                }
                break;
            case XmlTokenizedType.IDREF: 
                if (processIdentityConstraints) {
                    object p = FindId(name); 
                    if (p == null) { // add it to linked list to check it later 
                        idRefListHead = new IdRefNode(idRefListHead, name, this.PositionInfo.LineNumber, this.PositionInfo.LinePosition);
                    } 
                }

                break;
            case XmlTokenizedType.ENTITY: 
                ProcessEntity(schemaInfo, name, this, EventHandler, Reader.BaseURI, PositionInfo.LineNumber, PositionInfo.LinePosition);
                break; 
            default: 
                break;
            } 
        }

        //check the contents of this attribute to ensure it is valid according to the specified attribute type.
        private void CheckValue(string value, SchemaAttDef attdef) { 
            try {
                reader.TypedValueObject = null; 
                bool isAttn = attdef != null; 
                XmlSchemaDatatype dtype = isAttn ? attdef.Datatype : context.ElementDecl.Datatype;
                if (dtype == null) { 
                    return; // no reason to check
                }

                if (dtype.TokenizedType != XmlTokenizedType.CDATA) { 
                    value = value.Trim();
                } 
 
                object typedValue = dtype.ParseValue(value, NameTable, namespaceManager);
                reader.TypedValueObject = typedValue; 
                // Check special types
                XmlTokenizedType ttype = dtype.TokenizedType;
                if (ttype == XmlTokenizedType.ENTITY || ttype == XmlTokenizedType.ID || ttype == XmlTokenizedType.IDREF) {
                    if (dtype.Variety == XmlSchemaDatatypeVariety.List) { 
                        string[] ss = (string[])typedValue;
                        foreach(string s in ss) { 
                            ProcessTokenizedType(dtype.TokenizedType, s); 
                        }
                    } 
                    else {
                        ProcessTokenizedType(dtype.TokenizedType, (string)typedValue);
                    }
                } 

                SchemaDeclBase decl = isAttn ? (SchemaDeclBase)attdef : (SchemaDeclBase)context.ElementDecl; 
                if (decl.Values != null && !decl.CheckEnumeration(typedValue)) { 
                    if (dtype.TokenizedType == XmlTokenizedType.NOTATION) {
                        SendValidationEvent(Res.Sch_NotationValue, typedValue.ToString()); 
                    }
                    else {
                        SendValidationEvent(Res.Sch_EnumerationValue, typedValue.ToString());
                    } 

                } 
                if (!decl.CheckValue(typedValue)) { 
                    if (isAttn) {
                        SendValidationEvent(Res.Sch_FixedAttributeValue, attdef.Name.ToString()); 
                    }
                    else {
                        SendValidationEvent(Res.Sch_FixedElementValue, XmlSchemaValidator.QNameString(context.LocalName, context.Namespace));
                    } 
                }
            } 
            catch (XmlSchemaException) { 
                if (attdef != null) {
                    SendValidationEvent(Res.Sch_AttributeValueDataType, attdef.Name.ToString()); 
                }
                else {
                    SendValidationEvent(Res.Sch_ElementValueDataType, XmlSchemaValidator.QNameString(context.LocalName, context.Namespace));
                } 
            }
        } 
 

        internal void AddID(string name, object node) { 
            // Note: It used to be true that we only called this if _fValidate was true,
            // but due to the fact that you can now dynamically type somethign as an ID
            // that is no longer true.
            if (IDs == null) { 
                IDs = new Hashtable();
            } 
 
            IDs.Add(name, node);
        } 

        public override object  FindId(string name) {
            return IDs == null ? null : IDs[name];
        } 

        private bool GenEntity(XmlQualifiedName qname) { 
            string n = qname.Name; 
            if (n[0] == '#') { // char entity reference
                return false; 
            }
            else if (SchemaEntity.IsPredefinedEntity(n)) {
                return false;
            } 
            else {
                SchemaEntity en = GetEntity(qname, false); 
                if (en == null) { 
                    // well-formness error, see xml spec [68]
                    throw new XmlException(Res.Xml_UndeclaredEntity, n); 
                }
                if (!en.NData.IsEmpty) {
                    // well-formness error, see xml spec [68]
                    throw new XmlException(Res.Xml_UnparsedEntityRef, n); 
                }
 
                if (reader.StandAlone && en.DeclaredInExternal) { 
                    SendValidationEvent(Res.Sch_StandAlone);
                } 
                return true;
            }
        }
 

        private SchemaEntity GetEntity(XmlQualifiedName qname, bool fParameterEntity) { 
            if (fParameterEntity) { 
                return (SchemaEntity)schemaInfo.ParameterEntities[qname];
            } 
            else {
                return (SchemaEntity)schemaInfo.GeneralEntities[qname];
            }
        } 

        private void CheckForwardRefs() { 
            IdRefNode next = idRefListHead; 
            while (next != null) {
                if(FindId(next.Id) == null) { 
                    SendValidationEvent(new XmlSchemaException(Res.Sch_UndeclaredId, next.Id, reader.BaseURI, next.LineNo, next.LinePos));
                }
                IdRefNode ptr = next.Next;
                next.Next = null; // unhook each object so it is cleaned up by Garbage Collector 
                next = ptr;
            } 
            // not needed any more. 
            idRefListHead = null;
        } 

         private void Push(XmlQualifiedName elementName) {
            context = (ValidationState)validationStack.Push();
            if (context == null) { 
                context = new ValidationState();
                validationStack.AddToTop(context); 
            } 
            context.LocalName = elementName.Name;
            context.Namespace = elementName.Namespace; 
            context.HasMatched = false;
            context.IsNill = false;
            context.NeedValidateChildren = false;
         } 

        private bool Pop() { 
            if (validationStack.Length > 1) { 
                validationStack.Pop();
                context = (ValidationState)validationStack.Peek(); 
                return true;
            }
            return false;
        } 

        public static void SetDefaultTypedValue( 
            SchemaAttDef        attdef, 
            IDtdParserAdapter   readerAdapter
        ) { 
            try {
                string value = attdef.DefaultValueExpanded;
                XmlSchemaDatatype dtype = attdef.Datatype;
                if (dtype == null) { 
                    return; // no reason to check
                } 
                if (dtype.TokenizedType != XmlTokenizedType.CDATA) { 
                    value = value.Trim();
                } 
                attdef.DefaultValueTyped = dtype.ParseValue(value, readerAdapter.NameTable, readerAdapter.NamespaceManager);
            }
#if DEBUG
            catch (XmlSchemaException ex) { 
                Debug.WriteLineIf(DiagnosticsSwitches.XmlSchema.TraceError, ex.Message);
#else 
            catch (Exception)  { 
#endif
                XmlSchemaException e = new XmlSchemaException(Res.Sch_AttributeDefaultDataType, attdef.Name.ToString()); 
                readerAdapter.SendValidationEvent( XmlSeverityType.Error, e );
            }
        }
 
        public static void CheckDefaultValue(
            SchemaAttDef        attdef, 
            SchemaInfo          sinfo, 
            IDtdParserAdapter   readerAdapter
        ) { 
            try {
                XmlSchemaDatatype dtype = attdef.Datatype;
                if (dtype == null) {
                    return; // no reason to check 
                }
                object typedValue = attdef.DefaultValueTyped; 
 
                // Check special types
                XmlTokenizedType ttype = dtype.TokenizedType; 
                if (ttype == XmlTokenizedType.ENTITY) {
                    Uri baseUri = readerAdapter.BaseUri;
                    string baseUriStr = ( baseUri == null ) ? string.Empty : baseUri.ToString();
                    if (dtype.Variety == XmlSchemaDatatypeVariety.List) { 
                        string[] ss = (string[])typedValue;
                        foreach(string s in ss) { 
                            ProcessEntity(sinfo, s, readerAdapter, readerAdapter.EventHandler, baseUriStr, attdef.ValueLineNum, attdef.ValueLinePos); 
                        }
                    } 
                    else {
                        ProcessEntity(sinfo, (string)typedValue, readerAdapter, readerAdapter.EventHandler, baseUriStr, attdef.ValueLineNum, attdef.ValueLinePos);
                    }
                } 
                else if (ttype == XmlTokenizedType.ENUMERATION) {
                    if (!attdef.CheckEnumeration(typedValue)) { 
                        XmlSchemaException e = new XmlSchemaException(Res.Sch_EnumerationValue, typedValue.ToString(), readerAdapter.BaseUri.ToString(), attdef.ValueLineNum, attdef.ValueLinePos); 
                        readerAdapter.SendValidationEvent( XmlSeverityType.Error, e );
                    } 
                }
            }
#if DEBUG
            catch (XmlSchemaException ex) { 
                Debug.WriteLineIf(DiagnosticsSwitches.XmlSchema.TraceError, ex.Message);
#else 
            catch (Exception)  { 
#endif
                XmlSchemaException e = new XmlSchemaException(Res.Sch_AttributeDefaultDataType, attdef.Name.ToString()); 
                readerAdapter.SendValidationEvent( XmlSeverityType.Error, e );
            }
        }
    }; 
#pragma warning restore 618
 
} 


// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
//------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// [....] 
//-----------------------------------------------------------------------------
 
namespace System.Xml.Schema { 
    using System;
    using System.Collections; 
    using System.Text;
    using System.IO;
    using System.Net;
    using System.Diagnostics; 
    using System.Xml.Schema;
    using System.Xml.XPath; 
 
#pragma warning disable 618
 
    internal sealed class DtdValidator : BaseValidator {

        //required by ParseValue
        class NamespaceManager : XmlNamespaceManager { 
            public override string LookupNamespace(string prefix) { return prefix; }
        } 
 
        static NamespaceManager namespaceManager = new NamespaceManager();
        const int        STACK_INCREMENT = 10; 
        HWStack          validationStack;  // validaton contexts
        Hashtable        attPresence;
        XmlQualifiedName name = XmlQualifiedName.Empty;
        Hashtable        IDs; 
        IdRefNode        idRefListHead;
        bool             processIdentityConstraints; 
 
        internal DtdValidator(XmlValidatingReaderImpl reader, ValidationEventHandler eventHandler, bool processIdentityConstraints)  : base(reader, null, eventHandler) {
            this.processIdentityConstraints = processIdentityConstraints; 
            Init();
        }

        private void Init() { 
            Debug.Assert(reader != null);
            validationStack = new HWStack(STACK_INCREMENT); 
            textValue = new StringBuilder(); 
            name = XmlQualifiedName.Empty;
            attPresence = new Hashtable(); 
            schemaInfo = new SchemaInfo();
            checkDatatype = false;
            Push(name);
        } 

        public override void Validate() { 
            if (schemaInfo.SchemaType == SchemaType.DTD) { 
                switch (reader.NodeType) {
                        case XmlNodeType.Element: 
                            ValidateElement();
                            if (reader.IsEmptyElement) {
                                goto case XmlNodeType.EndElement;
                            } 
                            break;
                        case XmlNodeType.Whitespace: 
                        case XmlNodeType.SignificantWhitespace: 
                            if (MeetsStandAloneConstraint()) {
                                ValidateWhitespace(); 
                            }
                            break;
                        case XmlNodeType.ProcessingInstruction:
                        case XmlNodeType.Comment: 
                            ValidatePIComment();
                            break; 
 
                        case XmlNodeType.Text:          // text inside a node
                        case XmlNodeType.CDATA:         //  
                            ValidateText();
                            break;
                        case XmlNodeType.EntityReference:
                            if (!GenEntity( new XmlQualifiedName(reader.LocalName, reader.Prefix) ) ){ 
                                ValidateText();
                            } 
                            break; 
                        case XmlNodeType.EndElement:
                            ValidateEndElement(); 
                            break;
                }
            }
             else { 
                if(reader.Depth == 0 &&
                    reader.NodeType == XmlNodeType.Element) { 
                    SendValidationEvent(Res.Xml_NoDTDPresent, this.name.ToString(), XmlSeverityType.Warning); 
                }
            } 
        }

        private bool MeetsStandAloneConstraint() {
            if (reader.StandAlone &&                  // VC 1 - iv 
                 context.ElementDecl != null &&
                 context.ElementDecl.IsDeclaredInExternal && 
                 context.ElementDecl.ContentValidator.ContentType == XmlSchemaContentType.ElementOnly) { 
                 SendValidationEvent(Res.Sch_StandAlone);
                 return false; 
            }
            return true;
        }
 
        private void ValidatePIComment() {
            // When validating with a dtd, empty elements should be lexically empty. 
            if (context.NeedValidateChildren ) { 
                if (context.ElementDecl.ContentValidator == ContentValidator.Empty) {
                    SendValidationEvent(Res.Sch_InvalidPIComment); 
                }

            }
        } 

        private void ValidateElement() { 
            elementName.Init(reader.LocalName, reader.Prefix); 
            if ( (reader.Depth == 0) &&
                  (!schemaInfo.DocTypeName.IsEmpty) && 
                  (!schemaInfo.DocTypeName.Equals(elementName)) ){ //VC 1
                    SendValidationEvent(Res.Sch_RootMatchDocType);
                }
            else { 
                ValidateChildElement();
            } 
            ProcessElement(); 
        }
 
        private void ValidateChildElement() {
            Debug.Assert(reader.NodeType == XmlNodeType.Element);
            if (context.NeedValidateChildren) { //i think i can get away with removing this if cond since won't make this call for documentelement
                int errorCode = 0; 
                context.ElementDecl.ContentValidator.ValidateElement(elementName, context, out errorCode);
                if (errorCode < 0) { 
                    XmlSchemaValidator.ElementValidationError(elementName, context, EventHandler, reader, reader.BaseURI, PositionInfo.LineNumber, PositionInfo.LinePosition, false); 
                }
            } 
        }

        private void ValidateStartElement() {
            if (context.ElementDecl != null) { 
                Reader.SchemaTypeObject =  context.ElementDecl.SchemaType;
 
                if (Reader.IsEmptyElement  && context.ElementDecl.DefaultValueTyped != null) { 
                   Reader.TypedValueObject = context.ElementDecl.DefaultValueTyped;
                   context.IsNill = true; // reusing IsNill - what is this flag later used for?? 
                }
                if ( context.ElementDecl.HasRequiredAttribute ) {
                    attPresence.Clear();
                } 
            }
 
            if (Reader.MoveToFirstAttribute()) { 
                do {
                    try { 
                        reader.SchemaTypeObject = null;
                        SchemaAttDef attnDef = context.ElementDecl.GetAttDef( new XmlQualifiedName( reader.LocalName, reader.Prefix) );
                        if (attnDef != null) {
                            if (context.ElementDecl != null && context.ElementDecl.HasRequiredAttribute) { 
                                attPresence.Add(attnDef.Name, attnDef);
                            } 
                            Reader.SchemaTypeObject = attnDef.SchemaType; 

                            if (attnDef.Datatype != null && !reader.IsDefault) { //Since XmlTextReader adds default attributes, do not check again 
                                // set typed value
                                CheckValue(Reader.Value, attnDef);
                            }
                        } 
                        else {
                            SendValidationEvent(Res.Sch_UndeclaredAttribute, reader.Name); 
                        } 
                    }
                    catch (XmlSchemaException e) { 
                        e.SetSource(Reader.BaseURI, PositionInfo.LineNumber, PositionInfo.LinePosition);
                        SendValidationEvent(e);
                    }
                } while(Reader.MoveToNextAttribute()); 
                Reader.MoveToElement();
            } 
 
        }
 
        private void ValidateEndStartElement() {
            if (context.ElementDecl.HasRequiredAttribute) {
                try {
                    context.ElementDecl.CheckAttributes(attPresence, Reader.StandAlone); 
                }
                catch (XmlSchemaException e) { 
                    e.SetSource(Reader.BaseURI, PositionInfo.LineNumber, PositionInfo.LinePosition); 
                    SendValidationEvent(e);
                } 
            }

            if (context.ElementDecl.Datatype != null) {
                checkDatatype = true; 
                hasSibling = false;
                textString = string.Empty; 
                textValue.Length = 0; 
            }
        } 

        private void ProcessElement() {
            SchemaElementDecl elementDecl = schemaInfo.GetElementDecl(elementName);
            Push(elementName); 
            if (elementDecl != null) {
                context.ElementDecl = elementDecl; 
                ValidateStartElement(); 
                ValidateEndStartElement();
                context.NeedValidateChildren = true; 
                elementDecl.ContentValidator.InitValidation( context );
            }
            else {
                SendValidationEvent(Res.Sch_UndeclaredElement, XmlSchemaValidator.QNameString(context.LocalName, context.Namespace)); 
                context.ElementDecl = null;
            } 
        } 

        public override void CompleteValidation() { 
            if (schemaInfo.SchemaType == SchemaType.DTD) {
                do {
                    ValidateEndElement();
                } while (Pop()); 
                CheckForwardRefs();
            } 
        } 

        private void ValidateEndElement() { 
            if (context.ElementDecl != null) {
                if (context.NeedValidateChildren) {
                    if(!context.ElementDecl.ContentValidator.CompleteValidation(context)) {
                        XmlSchemaValidator.CompleteValidationError(context, EventHandler, reader, reader.BaseURI, PositionInfo.LineNumber, PositionInfo.LinePosition, false); 
                    }
                } 
 
                if (checkDatatype) {
                    string stringValue = !hasSibling ? textString : textValue.ToString();  // only for identity-constraint exception reporting 
                    CheckValue(stringValue, null);
                    checkDatatype = false;
                    textValue.Length = 0; // cleanup
                    textString = string.Empty; 
                }
            } 
            Pop(); 

        } 

        public override bool PreserveWhitespace {
            get { return context.ElementDecl != null ? context.ElementDecl.ContentValidator.PreserveWhitespace : false; }
        } 

 
        void ProcessTokenizedType( 
            XmlTokenizedType    ttype,
            string              name 
        ) {
            switch(ttype) {
            case XmlTokenizedType.ID:
                if (processIdentityConstraints) { 
                    if (FindId(name) != null) {
                        SendValidationEvent(Res.Sch_DupId, name); 
                    } 
                    else {
                        AddID(name, context.LocalName); 
                    }
                }
                break;
            case XmlTokenizedType.IDREF: 
                if (processIdentityConstraints) {
                    object p = FindId(name); 
                    if (p == null) { // add it to linked list to check it later 
                        idRefListHead = new IdRefNode(idRefListHead, name, this.PositionInfo.LineNumber, this.PositionInfo.LinePosition);
                    } 
                }

                break;
            case XmlTokenizedType.ENTITY: 
                ProcessEntity(schemaInfo, name, this, EventHandler, Reader.BaseURI, PositionInfo.LineNumber, PositionInfo.LinePosition);
                break; 
            default: 
                break;
            } 
        }

        //check the contents of this attribute to ensure it is valid according to the specified attribute type.
        private void CheckValue(string value, SchemaAttDef attdef) { 
            try {
                reader.TypedValueObject = null; 
                bool isAttn = attdef != null; 
                XmlSchemaDatatype dtype = isAttn ? attdef.Datatype : context.ElementDecl.Datatype;
                if (dtype == null) { 
                    return; // no reason to check
                }

                if (dtype.TokenizedType != XmlTokenizedType.CDATA) { 
                    value = value.Trim();
                } 
 
                object typedValue = dtype.ParseValue(value, NameTable, namespaceManager);
                reader.TypedValueObject = typedValue; 
                // Check special types
                XmlTokenizedType ttype = dtype.TokenizedType;
                if (ttype == XmlTokenizedType.ENTITY || ttype == XmlTokenizedType.ID || ttype == XmlTokenizedType.IDREF) {
                    if (dtype.Variety == XmlSchemaDatatypeVariety.List) { 
                        string[] ss = (string[])typedValue;
                        foreach(string s in ss) { 
                            ProcessTokenizedType(dtype.TokenizedType, s); 
                        }
                    } 
                    else {
                        ProcessTokenizedType(dtype.TokenizedType, (string)typedValue);
                    }
                } 

                SchemaDeclBase decl = isAttn ? (SchemaDeclBase)attdef : (SchemaDeclBase)context.ElementDecl; 
                if (decl.Values != null && !decl.CheckEnumeration(typedValue)) { 
                    if (dtype.TokenizedType == XmlTokenizedType.NOTATION) {
                        SendValidationEvent(Res.Sch_NotationValue, typedValue.ToString()); 
                    }
                    else {
                        SendValidationEvent(Res.Sch_EnumerationValue, typedValue.ToString());
                    } 

                } 
                if (!decl.CheckValue(typedValue)) { 
                    if (isAttn) {
                        SendValidationEvent(Res.Sch_FixedAttributeValue, attdef.Name.ToString()); 
                    }
                    else {
                        SendValidationEvent(Res.Sch_FixedElementValue, XmlSchemaValidator.QNameString(context.LocalName, context.Namespace));
                    } 
                }
            } 
            catch (XmlSchemaException) { 
                if (attdef != null) {
                    SendValidationEvent(Res.Sch_AttributeValueDataType, attdef.Name.ToString()); 
                }
                else {
                    SendValidationEvent(Res.Sch_ElementValueDataType, XmlSchemaValidator.QNameString(context.LocalName, context.Namespace));
                } 
            }
        } 
 

        internal void AddID(string name, object node) { 
            // Note: It used to be true that we only called this if _fValidate was true,
            // but due to the fact that you can now dynamically type somethign as an ID
            // that is no longer true.
            if (IDs == null) { 
                IDs = new Hashtable();
            } 
 
            IDs.Add(name, node);
        } 

        public override object  FindId(string name) {
            return IDs == null ? null : IDs[name];
        } 

        private bool GenEntity(XmlQualifiedName qname) { 
            string n = qname.Name; 
            if (n[0] == '#') { // char entity reference
                return false; 
            }
            else if (SchemaEntity.IsPredefinedEntity(n)) {
                return false;
            } 
            else {
                SchemaEntity en = GetEntity(qname, false); 
                if (en == null) { 
                    // well-formness error, see xml spec [68]
                    throw new XmlException(Res.Xml_UndeclaredEntity, n); 
                }
                if (!en.NData.IsEmpty) {
                    // well-formness error, see xml spec [68]
                    throw new XmlException(Res.Xml_UnparsedEntityRef, n); 
                }
 
                if (reader.StandAlone && en.DeclaredInExternal) { 
                    SendValidationEvent(Res.Sch_StandAlone);
                } 
                return true;
            }
        }
 

        private SchemaEntity GetEntity(XmlQualifiedName qname, bool fParameterEntity) { 
            if (fParameterEntity) { 
                return (SchemaEntity)schemaInfo.ParameterEntities[qname];
            } 
            else {
                return (SchemaEntity)schemaInfo.GeneralEntities[qname];
            }
        } 

        private void CheckForwardRefs() { 
            IdRefNode next = idRefListHead; 
            while (next != null) {
                if(FindId(next.Id) == null) { 
                    SendValidationEvent(new XmlSchemaException(Res.Sch_UndeclaredId, next.Id, reader.BaseURI, next.LineNo, next.LinePos));
                }
                IdRefNode ptr = next.Next;
                next.Next = null; // unhook each object so it is cleaned up by Garbage Collector 
                next = ptr;
            } 
            // not needed any more. 
            idRefListHead = null;
        } 

         private void Push(XmlQualifiedName elementName) {
            context = (ValidationState)validationStack.Push();
            if (context == null) { 
                context = new ValidationState();
                validationStack.AddToTop(context); 
            } 
            context.LocalName = elementName.Name;
            context.Namespace = elementName.Namespace; 
            context.HasMatched = false;
            context.IsNill = false;
            context.NeedValidateChildren = false;
         } 

        private bool Pop() { 
            if (validationStack.Length > 1) { 
                validationStack.Pop();
                context = (ValidationState)validationStack.Peek(); 
                return true;
            }
            return false;
        } 

        public static void SetDefaultTypedValue( 
            SchemaAttDef        attdef, 
            IDtdParserAdapter   readerAdapter
        ) { 
            try {
                string value = attdef.DefaultValueExpanded;
                XmlSchemaDatatype dtype = attdef.Datatype;
                if (dtype == null) { 
                    return; // no reason to check
                } 
                if (dtype.TokenizedType != XmlTokenizedType.CDATA) { 
                    value = value.Trim();
                } 
                attdef.DefaultValueTyped = dtype.ParseValue(value, readerAdapter.NameTable, readerAdapter.NamespaceManager);
            }
#if DEBUG
            catch (XmlSchemaException ex) { 
                Debug.WriteLineIf(DiagnosticsSwitches.XmlSchema.TraceError, ex.Message);
#else 
            catch (Exception)  { 
#endif
                XmlSchemaException e = new XmlSchemaException(Res.Sch_AttributeDefaultDataType, attdef.Name.ToString()); 
                readerAdapter.SendValidationEvent( XmlSeverityType.Error, e );
            }
        }
 
        public static void CheckDefaultValue(
            SchemaAttDef        attdef, 
            SchemaInfo          sinfo, 
            IDtdParserAdapter   readerAdapter
        ) { 
            try {
                XmlSchemaDatatype dtype = attdef.Datatype;
                if (dtype == null) {
                    return; // no reason to check 
                }
                object typedValue = attdef.DefaultValueTyped; 
 
                // Check special types
                XmlTokenizedType ttype = dtype.TokenizedType; 
                if (ttype == XmlTokenizedType.ENTITY) {
                    Uri baseUri = readerAdapter.BaseUri;
                    string baseUriStr = ( baseUri == null ) ? string.Empty : baseUri.ToString();
                    if (dtype.Variety == XmlSchemaDatatypeVariety.List) { 
                        string[] ss = (string[])typedValue;
                        foreach(string s in ss) { 
                            ProcessEntity(sinfo, s, readerAdapter, readerAdapter.EventHandler, baseUriStr, attdef.ValueLineNum, attdef.ValueLinePos); 
                        }
                    } 
                    else {
                        ProcessEntity(sinfo, (string)typedValue, readerAdapter, readerAdapter.EventHandler, baseUriStr, attdef.ValueLineNum, attdef.ValueLinePos);
                    }
                } 
                else if (ttype == XmlTokenizedType.ENUMERATION) {
                    if (!attdef.CheckEnumeration(typedValue)) { 
                        XmlSchemaException e = new XmlSchemaException(Res.Sch_EnumerationValue, typedValue.ToString(), readerAdapter.BaseUri.ToString(), attdef.ValueLineNum, attdef.ValueLinePos); 
                        readerAdapter.SendValidationEvent( XmlSeverityType.Error, e );
                    } 
                }
            }
#if DEBUG
            catch (XmlSchemaException ex) { 
                Debug.WriteLineIf(DiagnosticsSwitches.XmlSchema.TraceError, ex.Message);
#else 
            catch (Exception)  { 
#endif
                XmlSchemaException e = new XmlSchemaException(Res.Sch_AttributeDefaultDataType, attdef.Name.ToString()); 
                readerAdapter.SendValidationEvent( XmlSeverityType.Error, e );
            }
        }
    }; 
#pragma warning restore 618
 
} 


// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
                        

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