SchemaCollectionCompiler.cs source code in C# .NET

Source code for the .NET framework in C#

                        

Code:

/ Dotnetfx_Vista_SP2 / Dotnetfx_Vista_SP2 / 8.0.50727.4016 / DEVDIV / depot / DevDiv / releases / whidbey / NetFxQFE / ndp / fx / src / Xml / System / Xml / schema / SchemaCollectionCompiler.cs / 1 / SchemaCollectionCompiler.cs

                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// [....] 
//-----------------------------------------------------------------------------
 
namespace System.Xml.Schema { 

    using System; 
    using System.Collections;
    using System.Globalization;
    using System.Text;
    using System.Diagnostics; 

    internal sealed class SchemaCollectionCompiler : BaseProcessor { 
        bool compileContentModel; 
        XmlSchemaObjectTable examplars = new XmlSchemaObjectTable();
        Stack complexTypeStack = new Stack(); 
        XmlSchema schema;

        public SchemaCollectionCompiler(XmlNameTable nameTable, ValidationEventHandler eventHandler)
            : base(nameTable, null, eventHandler) { 
        }
 
        public bool Execute(XmlSchema schema, SchemaInfo schemaInfo, bool compileContentModel) { 
            this.compileContentModel = compileContentModel;
            this.schema = schema; 
            Prepare();
            Cleanup();
            Compile();
            if (!HasErrors) { 
                Output(schemaInfo);
            } 
            return !HasErrors; 
        }
 
        private void Prepare() {
            foreach (XmlSchemaElement element in this.schema.Elements.Values) {
                if (!element.SubstitutionGroup.IsEmpty) {
                    XmlSchemaSubstitutionGroup substitutionGroup = (XmlSchemaSubstitutionGroup)this.examplars[element.SubstitutionGroup]; 
                    if (substitutionGroup == null) {
                        substitutionGroup = new XmlSchemaSubstitutionGroupV1Compat(); 
                        substitutionGroup.Examplar = element.SubstitutionGroup; 
                        examplars.Add(element.SubstitutionGroup, substitutionGroup);
                    } 
                    ArrayList members = substitutionGroup.Members;
                    Debug.Assert(!members.Contains(element));
                    members.Add(element);
                } 
            }
        } 
 
        private void Cleanup() {
            foreach (XmlSchemaGroup group in this.schema.Groups.Values) { 
                CleanupGroup(group);
            }
            foreach (XmlSchemaAttributeGroup attributeGroup in this.schema.AttributeGroups.Values) {
                CleanupAttributeGroup(attributeGroup); 
            }
            foreach (XmlSchemaType type in this.schema.SchemaTypes.Values) { 
                if (type is XmlSchemaComplexType) { 
                    CleanupComplexType((XmlSchemaComplexType)type);
                } 
                else {
                    CleanupSimpleType((XmlSchemaSimpleType)type);
                }
            } 
            foreach (XmlSchemaElement element in this.schema.Elements.Values) {
                CleanupElement(element); 
            } 
            foreach (XmlSchemaAttribute attribute in this.schema.Attributes.Values) {
                CleanupAttribute(attribute); 
            }
        }

 
        internal static void Cleanup(XmlSchema schema) {
            foreach(XmlSchemaExternal include in schema.Includes) { 
                if (include.Schema != null) { 
                    Cleanup(include.Schema);
                } 
                if(include is XmlSchemaRedefine) {
                    XmlSchemaRedefine rdef = include as XmlSchemaRedefine;
                    rdef.AttributeGroups.Clear();
                    rdef.Groups.Clear(); 
                    rdef.SchemaTypes.Clear();
 
                 foreach(object item in rdef.Items) { 
                    if (item is XmlSchemaAttribute) {
                        CleanupAttribute((XmlSchemaAttribute)item); 
                    }
                    else if (item is XmlSchemaAttributeGroup) {
                        CleanupAttributeGroup((XmlSchemaAttributeGroup)item);
                    } 
                    else if (item is XmlSchemaComplexType) {
                        CleanupComplexType((XmlSchemaComplexType)item); 
                    } 
                    else if (item is XmlSchemaSimpleType) {
                        CleanupSimpleType((XmlSchemaSimpleType)item); 
                    }
                    else if (item is XmlSchemaElement) {
                        CleanupElement((XmlSchemaElement)item);
                    } 
                    else if (item is XmlSchemaGroup) {
                        CleanupGroup((XmlSchemaGroup)item); 
                    } 
                 }
                } 

            }

            foreach(object item in schema.Items) { 
                if (item is XmlSchemaAttribute) {
                    CleanupAttribute((XmlSchemaAttribute)item); 
                } 
                else if (item is XmlSchemaAttributeGroup) {
                    CleanupAttributeGroup((XmlSchemaAttributeGroup)item); 
                }
                else if (item is XmlSchemaComplexType) {
                    CleanupComplexType((XmlSchemaComplexType)item);
                } 
                else if (item is XmlSchemaSimpleType) {
                    CleanupSimpleType((XmlSchemaSimpleType)item); 
                } 
                else if (item is XmlSchemaElement) {
                    CleanupElement((XmlSchemaElement)item); 
                }
                else if (item is XmlSchemaGroup) {
                    CleanupGroup((XmlSchemaGroup)item);
                } 
            }
            schema.Attributes.Clear(); 
            schema.AttributeGroups.Clear(); 
            schema.SchemaTypes.Clear();
            schema.Elements.Clear(); 
            schema.Groups.Clear();
            schema.Notations.Clear();
            schema.Ids.Clear();
            schema.IdentityConstraints.Clear(); 
        }
 
        private void Compile() { 
            this.schema.SchemaTypes.Insert(DatatypeImplementation.QnAnyType, XmlSchemaComplexType.AnyType);
 
            foreach (XmlSchemaSubstitutionGroupV1Compat substitutionGroup in examplars.Values) {
                CompileSubstitutionGroup(substitutionGroup);
            }
            foreach (XmlSchemaGroup group in this.schema.Groups.Values) { 
                CompileGroup(group);
            } 
            foreach (XmlSchemaAttributeGroup attributeGroup in this.schema.AttributeGroups.Values) { 
                CompileAttributeGroup(attributeGroup);
            } 
            foreach (XmlSchemaType type in this.schema.SchemaTypes.Values) {
                if (type is XmlSchemaComplexType) {
                    CompileComplexType((XmlSchemaComplexType)type);
                } 
                else {
                    CompileSimpleType((XmlSchemaSimpleType)type); 
                } 
            }
            foreach (XmlSchemaElement element in this.schema.Elements.Values) { 
                if (element.ElementDecl == null) {
                    CompileElement(element);
                }
            } 
            foreach (XmlSchemaAttribute attribute in this.schema.Attributes.Values) {
                if (attribute.AttDef == null) { 
                    CompileAttribute(attribute); 
                }
            } 
            foreach (XmlSchemaIdentityConstraint identityConstraint in this.schema.IdentityConstraints.Values) {
                if (identityConstraint.CompiledConstraint == null) {
                    CompileIdentityConstraint(identityConstraint);
                } 
            }
            while (this.complexTypeStack.Count > 0) { 
                XmlSchemaComplexType type = (XmlSchemaComplexType)complexTypeStack.Pop(); 
                CompileCompexTypeElements(type);
            } 
            foreach (XmlSchemaType type in this.schema.SchemaTypes.Values) {
                if (type is XmlSchemaComplexType) {
                    CheckParticleDerivation((XmlSchemaComplexType)type);
                } 
            }
            foreach (XmlSchemaElement element in this.schema.Elements.Values) { 
                if (element.ElementSchemaType is XmlSchemaComplexType && element.SchemaTypeName == XmlQualifiedName.Empty) { // only local schemaTypes 
                    CheckParticleDerivation((XmlSchemaComplexType)element.ElementSchemaType);
                } 
            }
            foreach (XmlSchemaSubstitutionGroup substitutionGroup in examplars.Values) {
                CheckSubstitutionGroup(substitutionGroup);
            } 

            this.schema.SchemaTypes.Remove(DatatypeImplementation.QnAnyType); //For backward compatibility 
        } 

        private void Output(SchemaInfo schemaInfo) { 
            foreach (XmlSchemaElement element in this.schema.Elements.Values) {
                schemaInfo.TargetNamespaces[element.QualifiedName.Namespace] = true;
                schemaInfo.ElementDecls.Add(element.QualifiedName, element.ElementDecl);
            } 
            foreach (XmlSchemaAttribute attribute in this.schema.Attributes.Values) {
                schemaInfo.TargetNamespaces[attribute.QualifiedName.Namespace] = true; 
                schemaInfo.AttributeDecls.Add(attribute.QualifiedName, attribute.AttDef); 
            }
            foreach (XmlSchemaType type in this.schema.SchemaTypes.Values) { 
                schemaInfo.TargetNamespaces[type.QualifiedName.Namespace] = true;
                 XmlSchemaComplexType complexType = type as XmlSchemaComplexType;
                 if (complexType == null || (!complexType.IsAbstract && type != XmlSchemaComplexType.AnyType)) {
                    schemaInfo.ElementDeclsByType.Add(type.QualifiedName, type.ElementDecl); 
                 }
            } 
            foreach (XmlSchemaNotation notation in this.schema.Notations.Values) { 
                schemaInfo.TargetNamespaces[notation.QualifiedName.Namespace] = true;
                SchemaNotation no = new SchemaNotation(notation.QualifiedName); 
                no.SystemLiteral = notation.System;
                no.Pubid = notation.Public;
                if (schemaInfo.Notations[no.Name.Name] == null) {
                    schemaInfo.Notations.Add(no.Name.Name, no); 
                }
            } 
        } 

        private static void CleanupAttribute(XmlSchemaAttribute attribute) { 
            if (attribute.SchemaType != null) {
                CleanupSimpleType((XmlSchemaSimpleType)attribute.SchemaType);
            }
            attribute.AttDef = null; 
        }
 
        private static void CleanupAttributeGroup(XmlSchemaAttributeGroup attributeGroup) { 
            CleanupAttributes(attributeGroup.Attributes);
            attributeGroup.AttributeUses.Clear(); 
            attributeGroup.AttributeWildcard = null;
        }

        private static void CleanupComplexType(XmlSchemaComplexType complexType) { 
            if (complexType.ContentModel != null) { //simpleContent or complexContent
                if (complexType.ContentModel is XmlSchemaSimpleContent) { 
                    XmlSchemaSimpleContent simpleContent = (XmlSchemaSimpleContent)complexType.ContentModel; 
                    if (simpleContent.Content is XmlSchemaSimpleContentExtension) {
                        XmlSchemaSimpleContentExtension simpleExtension = (XmlSchemaSimpleContentExtension)simpleContent.Content; 
                        CleanupAttributes(simpleExtension.Attributes);
                    }
                    else { //simpleContent.Content is XmlSchemaSimpleContentRestriction
                        XmlSchemaSimpleContentRestriction simpleRestriction = (XmlSchemaSimpleContentRestriction)simpleContent.Content; 
                        CleanupAttributes(simpleRestriction.Attributes);
                    } 
                } 
                else { // complexType.ContentModel is XmlSchemaComplexContent
                    XmlSchemaComplexContent complexContent = (XmlSchemaComplexContent)complexType.ContentModel; 
                    if (complexContent.Content is XmlSchemaComplexContentExtension) {
                        XmlSchemaComplexContentExtension complexExtension = (XmlSchemaComplexContentExtension)complexContent.Content;
                        CleanupParticle(complexExtension.Particle);
                        CleanupAttributes(complexExtension.Attributes); 

                    } 
                    else { //XmlSchemaComplexContentRestriction 
                        XmlSchemaComplexContentRestriction complexRestriction = (XmlSchemaComplexContentRestriction)complexContent.Content;
                        CleanupParticle(complexRestriction.Particle); 
                        CleanupAttributes(complexRestriction.Attributes);
                    }
                }
            } 
            else { //equals XmlSchemaComplexContent with baseType is anyType
                CleanupParticle(complexType.Particle); 
                CleanupAttributes(complexType.Attributes); 
            }
            complexType.LocalElements.Clear(); 
            complexType.AttributeUses.Clear();
            complexType.SetAttributeWildcard(null);
            complexType.SetContentTypeParticle(XmlSchemaParticle.Empty);
            complexType.ElementDecl = null; 
        }
 
        private static void CleanupSimpleType(XmlSchemaSimpleType simpleType) { 
            simpleType.ElementDecl = null;
        } 

        private static void CleanupElement(XmlSchemaElement element) {
            if (element.SchemaType != null) {
                XmlSchemaComplexType complexType = element.SchemaType as XmlSchemaComplexType; 
                if (complexType != null) {
                    CleanupComplexType(complexType); 
                } 
                else {
                    CleanupSimpleType((XmlSchemaSimpleType)element.SchemaType); 
                }
            }
            foreach (XmlSchemaIdentityConstraint constr in element.Constraints) {
                constr.CompiledConstraint = null; 
            }
            element.ElementDecl = null; 
        } 

        private static void CleanupAttributes(XmlSchemaObjectCollection attributes) { 
            foreach (XmlSchemaObject obj in attributes) {
                if (obj is XmlSchemaAttribute) {
                    CleanupAttribute((XmlSchemaAttribute)obj);
                } 
            }
        } 
 
        private static void CleanupGroup(XmlSchemaGroup group) {
            CleanupParticle(group.Particle); 
            group.CanonicalParticle = null;
        }

        private static void CleanupParticle(XmlSchemaParticle particle) { 
            if (particle is XmlSchemaElement) {
                CleanupElement((XmlSchemaElement)particle); 
            } 
            else if (particle is XmlSchemaGroupBase) {
                foreach(XmlSchemaParticle p in ((XmlSchemaGroupBase)particle).Items) { 
                    CleanupParticle(p);
                }
            }
        } 

        private void CompileSubstitutionGroup(XmlSchemaSubstitutionGroupV1Compat substitutionGroup) { 
            if (substitutionGroup.IsProcessing) { 
                foreach (XmlSchemaElement element in substitutionGroup.Members) {
                    SendValidationEvent(Res.Sch_SubstitutionCircularRef, element); 
                    return;
                }
            }
            XmlSchemaElement examplar = (XmlSchemaElement)this.schema.Elements[substitutionGroup.Examplar]; 
            if (substitutionGroup.Members.Contains(examplar)) {// already checked
                return; 
            } 
            substitutionGroup.IsProcessing = true;
            if (examplar != null) { 
                if (examplar.FinalResolved == XmlSchemaDerivationMethod.All) {
                    SendValidationEvent(Res.Sch_InvalidExamplar, examplar);
                }
 
                foreach (XmlSchemaElement element in substitutionGroup.Members) {
 
                    //Chain to other head's that are members of this head's substGroup 
                    XmlSchemaSubstitutionGroupV1Compat g = (XmlSchemaSubstitutionGroupV1Compat)examplars[element.QualifiedName];
                    if (g != null) { 
                        CompileSubstitutionGroup(g);
                        foreach (XmlSchemaElement element1 in g.Choice.Items) {
                            substitutionGroup.Choice.Items.Add(element1);
                        } 
                    }
                    else { 
                        substitutionGroup.Choice.Items.Add(element); 
                    }
                } 
                substitutionGroup.Choice.Items.Add(examplar);
                substitutionGroup.Members.Add(examplar); // Compiled mark
            }
            else { 
                foreach (XmlSchemaElement element in substitutionGroup.Members) {
                    SendValidationEvent(Res.Sch_NoExamplar, element); 
                    break; 
                }
            } 
           substitutionGroup.IsProcessing = false;
        }

        private void CheckSubstitutionGroup(XmlSchemaSubstitutionGroup substitutionGroup) { 
            XmlSchemaElement examplar = (XmlSchemaElement)this.schema.Elements[substitutionGroup.Examplar];
            if (examplar != null) { 
                foreach (XmlSchemaElement element in substitutionGroup.Members) { 
                    if (element != examplar) {
                        if (!XmlSchemaType.IsDerivedFrom(element.ElementSchemaType, examplar.ElementSchemaType, examplar.FinalResolved)) { 
                            SendValidationEvent(Res.Sch_InvalidSubstitutionMember, (element.QualifiedName).ToString(), (examplar.QualifiedName).ToString(), element);
                        }
                    }
                } 
            }
        } 
 
        private void CompileGroup(XmlSchemaGroup group) {
            if (group.IsProcessing) { 
                SendValidationEvent(Res.Sch_GroupCircularRef, group);
                group.CanonicalParticle = XmlSchemaParticle.Empty;
            }
            else { 
                group.IsProcessing = true;
                if (group.CanonicalParticle == null) { 
                    group.CanonicalParticle = CannonicalizeParticle(group.Particle, true, true); 
                }
                Debug.Assert(group.CanonicalParticle != null); 
                group.IsProcessing = false;
            }
        }
 
        private void CompileSimpleType(XmlSchemaSimpleType simpleType) {
            if (simpleType.IsProcessing) { 
                throw new XmlSchemaException(Res.Sch_TypeCircularRef, simpleType); 
            }
            if (simpleType.ElementDecl != null) { // already compiled 
                return;
            }
            simpleType.IsProcessing = true;
            try { 
                if (simpleType.Content is XmlSchemaSimpleTypeList) {
                    XmlSchemaSimpleTypeList list = (XmlSchemaSimpleTypeList)simpleType.Content; 
                    XmlSchemaDatatype datatype; 
                    simpleType.SetBaseSchemaType(DatatypeImplementation.AnySimpleType);
                    if (list.ItemTypeName.IsEmpty) { 
                        CompileSimpleType(list.ItemType);
                        list.BaseItemType = list.ItemType;
                        datatype = list.ItemType.Datatype;
                    } 
                    else {
                        XmlSchemaSimpleType type = GetSimpleType(list.ItemTypeName); 
                        if (type != null) { 
                            if ((type.FinalResolved & XmlSchemaDerivationMethod.List) != 0) {
                                SendValidationEvent(Res.Sch_BaseFinalList, simpleType); 
                            }
                            list.BaseItemType = type;
                            datatype = type.Datatype;
                        } 
                        else {
                            throw new XmlSchemaException(Res.Sch_UndeclaredSimpleType, list.ItemTypeName.ToString(), simpleType); 
                        } 
                    }
                    simpleType.SetDatatype(datatype.DeriveByList(simpleType)); 
                    simpleType.SetDerivedBy(XmlSchemaDerivationMethod.List);
                }
                else if (simpleType.Content is XmlSchemaSimpleTypeRestriction) {
                    XmlSchemaSimpleTypeRestriction restriction = (XmlSchemaSimpleTypeRestriction)simpleType.Content; 
                    XmlSchemaDatatype datatype;
                    if (restriction.BaseTypeName.IsEmpty) { 
                        CompileSimpleType(restriction.BaseType); 
                        simpleType.SetBaseSchemaType(restriction.BaseType);
                        datatype = restriction.BaseType.Datatype; 
                    }
                    else if (simpleType.Redefined != null && restriction.BaseTypeName == simpleType.Redefined.QualifiedName) {
                        CompileSimpleType((XmlSchemaSimpleType)simpleType.Redefined);
                        simpleType.SetBaseSchemaType(simpleType.Redefined.BaseXmlSchemaType); 
                        datatype = simpleType.Redefined.Datatype;
                    } 
                    else { 
                        if (restriction.BaseTypeName.Equals(DatatypeImplementation.QnAnySimpleType)) {
                            throw new XmlSchemaException(Res.Sch_InvalidSimpleTypeRestriction, restriction.BaseTypeName.ToString(), simpleType); 
                        }
                        XmlSchemaSimpleType type = GetSimpleType(restriction.BaseTypeName);
                        if (type != null) {
                            if ((type.FinalResolved & XmlSchemaDerivationMethod.Restriction) != 0) { 
                                SendValidationEvent(Res.Sch_BaseFinalRestriction, simpleType);
                            } 
                            simpleType.SetBaseSchemaType(type); 
                            datatype = type.Datatype;
                        } 
                        else {
                            throw new XmlSchemaException(Res.Sch_UndeclaredSimpleType, restriction.BaseTypeName.ToString(), simpleType);
                        }
                    } 
                    simpleType.SetDatatype(datatype.DeriveByRestriction(restriction.Facets, NameTable, simpleType));
                    simpleType.SetDerivedBy(XmlSchemaDerivationMethod.Restriction); 
                } 
                else { //simpleType.Content is XmlSchemaSimpleTypeUnion
                    XmlSchemaSimpleType[] baseTypes = CompileBaseMemberTypes(simpleType); 
                    simpleType.SetBaseSchemaType(DatatypeImplementation.AnySimpleType);
                    simpleType.SetDatatype(XmlSchemaDatatype.DeriveByUnion(baseTypes, simpleType));
                    simpleType.SetDerivedBy(XmlSchemaDerivationMethod.Union);
                } 
            }
            catch (XmlSchemaException e) { 
                if (e.SourceSchemaObject == null) { 
                    e.SetSource(simpleType);
                } 
                SendValidationEvent(e);
                simpleType.SetDatatype(DatatypeImplementation.AnySimpleType.Datatype);
            }
            finally { 
                SchemaElementDecl decl = new SchemaElementDecl();
                decl.ContentValidator = ContentValidator.TextOnly; 
                decl.SchemaType = simpleType; 
                decl.Datatype = simpleType.Datatype;
                simpleType.ElementDecl = decl; 
                simpleType.IsProcessing = false;
            }
        }
 
        private XmlSchemaSimpleType[] CompileBaseMemberTypes(XmlSchemaSimpleType simpleType) {
            XmlSchemaSimpleType unionMember; 
            ArrayList memberTypeDefinitions = new ArrayList(); 

            XmlSchemaSimpleTypeUnion mainUnion = (XmlSchemaSimpleTypeUnion)simpleType.Content; 

            Array mainMemberTypes = mainUnion.MemberTypes;
            if (mainMemberTypes != null) {
                foreach(XmlQualifiedName memberName in mainMemberTypes) { 
                    unionMember = GetSimpleType(memberName);
                    if (unionMember != null) { 
                        if (unionMember.Datatype.Variety == XmlSchemaDatatypeVariety.Union) { //union of union 
                            CheckUnionType(unionMember, memberTypeDefinitions, simpleType);
                        } 
                        else { //its list or atomic
                            memberTypeDefinitions.Add(unionMember);
                        }
                        //Check derivation method of the member that is referenced 
                        if ((unionMember.FinalResolved & XmlSchemaDerivationMethod.Union) != 0) {
                            SendValidationEvent(Res.Sch_BaseFinalUnion, simpleType); 
                        } 
                    }
                    else { 
                        throw new XmlSchemaException(Res.Sch_UndeclaredSimpleType, memberName.ToString(), simpleType);
                    }
                }
            } 

            //Now add the baseTypes that are defined inside the union itself 
            XmlSchemaObjectCollection mainBaseTypes = mainUnion.BaseTypes; // 
            if (mainBaseTypes != null) {
                foreach(XmlSchemaSimpleType st in mainBaseTypes) { 
                    CompileSimpleType(st);
                    if (st.Datatype.Variety == XmlSchemaDatatypeVariety.Union) { //union of union
                        CheckUnionType(st, memberTypeDefinitions, simpleType);
                    } 
                    else {  //its list or atomic
                        memberTypeDefinitions.Add(st); 
                    } 
                }
            } 
            //set all types
            mainUnion.SetBaseMemberTypes(memberTypeDefinitions.ToArray(typeof(XmlSchemaSimpleType)) as XmlSchemaSimpleType[]);
            return mainUnion.BaseMemberTypes;
        } 

        private void CheckUnionType(XmlSchemaSimpleType unionMember, ArrayList memberTypeDefinitions, XmlSchemaSimpleType parentType) { 
            XmlSchemaDatatype unionDatatype = unionMember.Datatype; 
            if (unionMember.DerivedBy == XmlSchemaDerivationMethod.Restriction && (unionDatatype.HasLexicalFacets || unionDatatype.HasValueFacets) ) {
                SendValidationEvent(Res.Sch_UnionFromUnion, parentType); 
            }
            else {
                Datatype_union uniondt = unionMember.Datatype as Datatype_union;
                memberTypeDefinitions.AddRange(uniondt.BaseMemberTypes); 
            }
        } 
 
        private void CompileComplexType(XmlSchemaComplexType complexType) {
            if (complexType.ElementDecl != null) { //already compiled 
                return;
            }
            if (complexType.IsProcessing) {
                SendValidationEvent(Res.Sch_TypeCircularRef, complexType); 
                return;
            } 
            complexType.IsProcessing = true; 
            if (complexType.ContentModel != null) { //simpleContent or complexContent
                if (complexType.ContentModel is XmlSchemaSimpleContent) { 
                    XmlSchemaSimpleContent simpleContent = (XmlSchemaSimpleContent)complexType.ContentModel;
                    complexType.SetContentType(XmlSchemaContentType.TextOnly);
                    if (simpleContent.Content is XmlSchemaSimpleContentExtension) {
                        CompileSimpleContentExtension(complexType, (XmlSchemaSimpleContentExtension)simpleContent.Content); 
                    }
                    else { //simpleContent.Content is XmlSchemaSimpleContentRestriction 
                        CompileSimpleContentRestriction(complexType, (XmlSchemaSimpleContentRestriction)simpleContent.Content); 
                    }
                } 
                else { // complexType.ContentModel is XmlSchemaComplexContent
                    XmlSchemaComplexContent complexContent = (XmlSchemaComplexContent)complexType.ContentModel;
                    if (complexContent.Content is XmlSchemaComplexContentExtension) {
                        CompileComplexContentExtension(complexType, complexContent, (XmlSchemaComplexContentExtension)complexContent.Content); 
                    }
                    else { // complexContent.Content is XmlSchemaComplexContentRestriction 
                        CompileComplexContentRestriction(complexType, complexContent, (XmlSchemaComplexContentRestriction)complexContent.Content); 
                    }
                } 
            }
            else { //equals XmlSchemaComplexContent with baseType is anyType
                    complexType.SetBaseSchemaType(XmlSchemaComplexType.AnyType);
                    CompileLocalAttributes(XmlSchemaComplexType.AnyType, complexType, complexType.Attributes, complexType.AnyAttribute, XmlSchemaDerivationMethod.Restriction); 
                    complexType.SetDerivedBy(XmlSchemaDerivationMethod.Restriction);
                    complexType.SetContentTypeParticle(CompileContentTypeParticle(complexType.Particle, true)); 
                    complexType.SetContentType(GetSchemaContentType(complexType, null, complexType.ContentTypeParticle)); 
            }
            bool hasID = false; 
            foreach(XmlSchemaAttribute attribute in complexType.AttributeUses.Values) {
                if (attribute.Use != XmlSchemaUse.Prohibited) {
                    XmlSchemaDatatype datatype = attribute.Datatype;
                    if (datatype != null && datatype.TokenizedType == XmlTokenizedType.ID) { 
                        if (hasID) {
                            SendValidationEvent(Res.Sch_TwoIdAttrUses, complexType); 
                        } 
                        else {
                            hasID = true; 
                        }
                    }
                }
            } 
            SchemaElementDecl decl = new SchemaElementDecl();
            decl.ContentValidator = CompileComplexContent(complexType); 
            decl.SchemaType = complexType; 
            decl.IsAbstract = complexType.IsAbstract;
            decl.Datatype = complexType.Datatype; 
            decl.Block = complexType.BlockResolved;
            decl.AnyAttribute = complexType.AttributeWildcard;
            foreach(XmlSchemaAttribute attribute in complexType.AttributeUses.Values) {
                if (attribute.Use == XmlSchemaUse.Prohibited) { 
                    if (decl.ProhibitedAttributes[attribute.QualifiedName] == null) {
                        decl.ProhibitedAttributes.Add(attribute.QualifiedName, attribute.QualifiedName); 
                    } 
                }
                else { 
                    if (decl.AttDefs[attribute.QualifiedName] == null && attribute.AttDef != null && attribute.AttDef.Name != XmlQualifiedName.Empty && attribute.AttDef != SchemaAttDef.Empty) {
                        decl.AddAttDef(attribute.AttDef);
                    }
                } 
            }
            decl.EndAddAttDef(); 
 
            complexType.ElementDecl = decl;
 
            complexType.IsProcessing = false;
        }

 
        private void CompileSimpleContentExtension(XmlSchemaComplexType complexType, XmlSchemaSimpleContentExtension simpleExtension) {
            XmlSchemaComplexType baseType = null; 
            if (complexType.Redefined != null && simpleExtension.BaseTypeName == complexType.Redefined.QualifiedName) { 
                baseType = (XmlSchemaComplexType)complexType.Redefined;
                CompileComplexType(baseType); 
                complexType.SetBaseSchemaType(baseType);
                complexType.SetDatatype(baseType.Datatype);
            }
            else { 
                XmlSchemaType bto = GetAnySchemaType(simpleExtension.BaseTypeName);
                if (bto == null) { 
                    SendValidationEvent(Res.Sch_UndeclaredType, simpleExtension.BaseTypeName.ToString(), complexType); 
                }
                else { 
                    complexType.SetBaseSchemaType(bto);
                    complexType.SetDatatype(bto.Datatype);
                }
                baseType = bto as XmlSchemaComplexType; 
            }
            if (baseType != null) { 
                if ((baseType.FinalResolved & XmlSchemaDerivationMethod.Extension) != 0) { 
                    SendValidationEvent(Res.Sch_BaseFinalExtension, complexType);
                } 
                if (baseType.ContentType != XmlSchemaContentType.TextOnly) {
                    SendValidationEvent(Res.Sch_NotSimpleContent, complexType);
                }
            } 
            complexType.SetDerivedBy(XmlSchemaDerivationMethod.Extension);
            CompileLocalAttributes(baseType, complexType, simpleExtension.Attributes, simpleExtension.AnyAttribute, XmlSchemaDerivationMethod.Extension); 
        } 

        private void CompileSimpleContentRestriction(XmlSchemaComplexType complexType, XmlSchemaSimpleContentRestriction simpleRestriction) { 
            XmlSchemaComplexType baseType = null;
            XmlSchemaDatatype datatype = null;
            if (complexType.Redefined != null && simpleRestriction.BaseTypeName == complexType.Redefined.QualifiedName) {
                baseType = (XmlSchemaComplexType)complexType.Redefined; 
                CompileComplexType(baseType);
                datatype = baseType.Datatype; 
            } 
            else {
                baseType = GetComplexType(simpleRestriction.BaseTypeName); 
                if (baseType == null) {
                    SendValidationEvent(Res.Sch_UndefBaseRestriction, simpleRestriction.BaseTypeName.ToString(), simpleRestriction);
                    return;
                } 
                if (baseType.ContentType == XmlSchemaContentType.TextOnly) {
                    if (simpleRestriction.BaseType == null) { 
                        datatype = baseType.Datatype; 
                        //There is a bug here. Need to check if simpleRestriction has facets.
                        //If yes, Need tp apply these facets as well. 
                    }
                    else {
                        CompileSimpleType(simpleRestriction.BaseType);
                        if(!XmlSchemaType.IsDerivedFromDatatype(simpleRestriction.BaseType.Datatype, baseType.Datatype, XmlSchemaDerivationMethod.None)) { 
                           SendValidationEvent(Res.Sch_DerivedNotFromBase, simpleRestriction);
                        } 
                        datatype = simpleRestriction.BaseType.Datatype; 
                    }
                } 
                else if (baseType.ContentType == XmlSchemaContentType.Mixed && baseType.ElementDecl.ContentValidator.IsEmptiable) {
                    if (simpleRestriction.BaseType != null) {
                        CompileSimpleType(simpleRestriction.BaseType);
                        complexType.SetBaseSchemaType(simpleRestriction.BaseType); 
                        datatype = simpleRestriction.BaseType.Datatype;
                    } 
                    else { 
                        SendValidationEvent(Res.Sch_NeedSimpleTypeChild, simpleRestriction);
                    } 
                }
                else {
                    SendValidationEvent(Res.Sch_NotSimpleContent, complexType);
                } 
            }
            if (baseType != null && baseType.ElementDecl != null) { 
                if ((baseType.FinalResolved & XmlSchemaDerivationMethod.Restriction) != 0) { 
                    SendValidationEvent(Res.Sch_BaseFinalRestriction, complexType);
                } 
            }
            if (baseType != null) {
                complexType.SetBaseSchemaType(baseType);
            } 
            if (datatype != null) {
                try { 
                    complexType.SetDatatype(datatype.DeriveByRestriction(simpleRestriction.Facets, NameTable, complexType)); 
                }
                catch (XmlSchemaException e) { 
                    if (e.SourceSchemaObject == null) {
                        e.SetSource(complexType);
                    }
                    SendValidationEvent(e); 
                    complexType.SetDatatype(DatatypeImplementation.AnySimpleType.Datatype);
                } 
            } 
            complexType.SetDerivedBy(XmlSchemaDerivationMethod.Restriction);
            CompileLocalAttributes(baseType, complexType, simpleRestriction.Attributes, simpleRestriction.AnyAttribute, XmlSchemaDerivationMethod.Restriction); 
        }

        private void CompileComplexContentExtension(XmlSchemaComplexType complexType, XmlSchemaComplexContent complexContent, XmlSchemaComplexContentExtension complexExtension) {
            XmlSchemaComplexType baseType = null; 
            if (complexType.Redefined != null && complexExtension.BaseTypeName == complexType.Redefined.QualifiedName) {
                baseType = (XmlSchemaComplexType)complexType.Redefined; 
                CompileComplexType(baseType); 
            }
            else { 
                baseType = GetComplexType(complexExtension.BaseTypeName);
                if (baseType == null) {
                    SendValidationEvent(Res.Sch_UndefBaseExtension, complexExtension.BaseTypeName.ToString(), complexExtension);
                    return; 
                }
            } 
            if (baseType != null && baseType.ElementDecl != null) { 
                if (baseType.ContentType == XmlSchemaContentType.TextOnly) {
                    SendValidationEvent(Res.Sch_NotComplexContent, complexType); 
                    return;
                }
            }
            complexType.SetBaseSchemaType(baseType); 
            if ((baseType.FinalResolved & XmlSchemaDerivationMethod.Extension) != 0) {
                SendValidationEvent(Res.Sch_BaseFinalExtension, complexType); 
            } 
            CompileLocalAttributes(baseType, complexType, complexExtension.Attributes, complexExtension.AnyAttribute, XmlSchemaDerivationMethod.Extension);
 
            XmlSchemaParticle baseParticle = baseType.ContentTypeParticle;
            XmlSchemaParticle extendedParticle = CannonicalizeParticle(complexExtension.Particle, true, true);
            if (baseParticle != XmlSchemaParticle.Empty) {
                if (extendedParticle != XmlSchemaParticle.Empty) { 
                    XmlSchemaSequence compiledParticle = new XmlSchemaSequence();
                    compiledParticle.Items.Add(baseParticle); 
                    compiledParticle.Items.Add(extendedParticle); 
                    complexType.SetContentTypeParticle(CompileContentTypeParticle(compiledParticle, false));
                } 
                else {
                    complexType.SetContentTypeParticle(baseParticle);
                }
                XmlSchemaContentType contentType = GetSchemaContentType(complexType, complexContent, extendedParticle); 
                if (contentType == XmlSchemaContentType.Empty) { //Derived content type is empty, Get ContentType from base
                    contentType = baseType.ContentType; 
                } 
                complexType.SetContentType(contentType);
                if (complexType.ContentType != baseType.ContentType) { 
                    SendValidationEvent(Res.Sch_DifContentType, complexType);
                }
            }
            else { 
                complexType.SetContentTypeParticle(extendedParticle);
                complexType.SetContentType(GetSchemaContentType(complexType, complexContent, complexType.ContentTypeParticle)); 
            } 
            complexType.SetDerivedBy(XmlSchemaDerivationMethod.Extension);
        } 

        private void CompileComplexContentRestriction(XmlSchemaComplexType complexType, XmlSchemaComplexContent complexContent, XmlSchemaComplexContentRestriction complexRestriction) {
            XmlSchemaComplexType baseType = null;
            if (complexType.Redefined != null && complexRestriction.BaseTypeName == complexType.Redefined.QualifiedName) { 
                baseType = (XmlSchemaComplexType)complexType.Redefined;
                CompileComplexType(baseType); 
            } 
            else {
                baseType = GetComplexType(complexRestriction.BaseTypeName); 
                if (baseType == null) {
                    SendValidationEvent(Res.Sch_UndefBaseRestriction, complexRestriction.BaseTypeName.ToString(), complexRestriction);
                    return;
                } 
            }
            if (baseType != null && baseType.ElementDecl != null) { 
                if (baseType.ContentType == XmlSchemaContentType.TextOnly) { 
                    SendValidationEvent(Res.Sch_NotComplexContent, complexType);
                    return; 
                }
            }
            complexType.SetBaseSchemaType(baseType);
            if ((baseType.FinalResolved & XmlSchemaDerivationMethod.Restriction) != 0) { 
                SendValidationEvent(Res.Sch_BaseFinalRestriction, complexType);
            } 
            CompileLocalAttributes(baseType, complexType, complexRestriction.Attributes, complexRestriction.AnyAttribute, XmlSchemaDerivationMethod.Restriction); 

            complexType.SetContentTypeParticle(CompileContentTypeParticle(complexRestriction.Particle, true)); 
            complexType.SetContentType(GetSchemaContentType(complexType, complexContent, complexType.ContentTypeParticle));
            if (complexType.ContentType == XmlSchemaContentType.Empty) {
                if (baseType.ElementDecl != null) {
                    Debug.Assert(baseType.ElementDecl.ContentValidator != null); 
                }
                if (baseType.ElementDecl != null && !baseType.ElementDecl.ContentValidator.IsEmptiable) { 
                    SendValidationEvent(Res.Sch_InvalidContentRestriction, complexType); 
                }
            } 
            complexType.SetDerivedBy(XmlSchemaDerivationMethod.Restriction);
        }

        private void CheckParticleDerivation(XmlSchemaComplexType complexType) { 
            XmlSchemaComplexType baseType = complexType.BaseXmlSchemaType as XmlSchemaComplexType;
            if (baseType != null && baseType != XmlSchemaComplexType.AnyType && complexType.DerivedBy == XmlSchemaDerivationMethod.Restriction) { 
                if (!IsValidRestriction(complexType.ContentTypeParticle, baseType.ContentTypeParticle)) { 
#if DEBUG
                    if(complexType.ContentTypeParticle != null && baseType.ContentTypeParticle != null) { 
                        string position = string.Empty;
                        if (complexType.SourceUri != null) {
                            position = " in " + complexType.SourceUri + "(" + complexType.LineNumber + ", " + complexType.LinePosition + ")";
                        } 
                        Debug.WriteLineIf(DiagnosticsSwitches.XmlSchema.TraceError, "Invalid complexType content restriction" + position);
                        Debug.WriteLineIf(DiagnosticsSwitches.XmlSchema.TraceError, "     Base    " + DumpContentModel(baseType.ContentTypeParticle)); 
                        Debug.WriteLineIf(DiagnosticsSwitches.XmlSchema.TraceError, "     Derived " + DumpContentModel(complexType.ContentTypeParticle)); 
                    }
#endif 
                    SendValidationEvent(Res.Sch_InvalidParticleRestriction, complexType);
                }
            }
        } 

        private XmlSchemaParticle CompileContentTypeParticle(XmlSchemaParticle particle, bool substitution) { 
            XmlSchemaParticle ctp = CannonicalizeParticle(particle, true, substitution); 
            XmlSchemaChoice choice = ctp as XmlSchemaChoice;
            if (choice != null && choice.Items.Count == 0) { 
                if (choice.MinOccurs != decimal.Zero) {
                    SendValidationEvent(Res.Sch_EmptyChoice, choice, XmlSeverityType.Warning);
                }
                return XmlSchemaParticle.Empty; 
            }
            return ctp; 
        } 

        private XmlSchemaParticle CannonicalizeParticle(XmlSchemaParticle particle, bool root, bool substitution) { 
            if (particle == null || particle.IsEmpty) {
                return XmlSchemaParticle.Empty;
            }
            else if (particle is XmlSchemaElement) { 
                return CannonicalizeElement((XmlSchemaElement)particle, substitution);
            } 
            else if (particle is XmlSchemaGroupRef) { 
                return CannonicalizeGroupRef((XmlSchemaGroupRef)particle, root, substitution);
            } 
            else if (particle is XmlSchemaAll) {
                return CannonicalizeAll((XmlSchemaAll)particle, root, substitution);
            }
            else if (particle is XmlSchemaChoice) { 
                return CannonicalizeChoice((XmlSchemaChoice)particle, root, substitution);
            } 
            else if (particle is XmlSchemaSequence) { 
                return CannonicalizeSequence((XmlSchemaSequence)particle, root, substitution);
            } 
            else {
                return particle;
            }
        } 

        private XmlSchemaParticle CannonicalizeElement(XmlSchemaElement element, bool substitution) { 
            if (!element.RefName.IsEmpty && substitution && (element.BlockResolved & XmlSchemaDerivationMethod.Substitution) == 0) { 
                XmlSchemaSubstitutionGroupV1Compat substitutionGroup = (XmlSchemaSubstitutionGroupV1Compat)examplars[element.QualifiedName];
                if (substitutionGroup == null) { 
                    return element;
                }
                else {
                    XmlSchemaChoice choice = (XmlSchemaChoice)substitutionGroup.Choice.Clone(); 
                    choice.MinOccurs = element.MinOccurs;
                    choice.MaxOccurs = element.MaxOccurs; 
                    return choice; 
                }
            } 
            else {
                return element;
            }
        } 

        private XmlSchemaParticle CannonicalizeGroupRef(XmlSchemaGroupRef groupRef, bool root,  bool substitution) { 
            XmlSchemaGroup group; 
            if (groupRef.Redefined != null) {
                group = groupRef.Redefined; 
            }
            else {
                group = (XmlSchemaGroup)this.schema.Groups[groupRef.RefName];
            } 
            if (group == null) {
                SendValidationEvent(Res.Sch_UndefGroupRef, groupRef.RefName.ToString(), groupRef); 
                return XmlSchemaParticle.Empty; 
            }
            if (group.CanonicalParticle == null) { 
                CompileGroup(group);
            }
            if (group.CanonicalParticle == XmlSchemaParticle.Empty) {
                return XmlSchemaParticle.Empty; 
            }
            XmlSchemaGroupBase groupBase = (XmlSchemaGroupBase)group.CanonicalParticle; 
            if (groupBase is XmlSchemaAll) { 
                if (!root) {
                    SendValidationEvent(Res.Sch_AllRefNotRoot, "", groupRef); 
                    return XmlSchemaParticle.Empty;
                }
                if (groupRef.MinOccurs != decimal.One || groupRef.MaxOccurs != decimal.One) {
                    SendValidationEvent(Res.Sch_AllRefMinMax, groupRef); 
                    return XmlSchemaParticle.Empty;
                } 
            } 
            else if (groupBase is XmlSchemaChoice && groupBase.Items.Count == 0) {
                if (groupRef.MinOccurs != decimal.Zero) { 
                    SendValidationEvent(Res.Sch_EmptyChoice, groupRef, XmlSeverityType.Warning);
                }
                return XmlSchemaParticle.Empty;
            } 
            XmlSchemaGroupBase groupRefBase = (
                (groupBase is XmlSchemaSequence) ? (XmlSchemaGroupBase)new XmlSchemaSequence() : 
                (groupBase is XmlSchemaChoice)   ? (XmlSchemaGroupBase)new XmlSchemaChoice() : 
                                                   (XmlSchemaGroupBase)new XmlSchemaAll()
            ); 
            groupRefBase.MinOccurs = groupRef.MinOccurs;
            groupRefBase.MaxOccurs = groupRef.MaxOccurs;
            foreach (XmlSchemaParticle particle in groupBase.Items) {
                groupRefBase.Items.Add(particle); 
            }
            groupRef.SetParticle(groupRefBase); 
            return groupRefBase; 
        }
 
        private XmlSchemaParticle CannonicalizeAll(XmlSchemaAll all, bool root, bool substitution) {
            if (all.Items.Count > 0) {
                XmlSchemaAll newAll = new XmlSchemaAll();
                newAll.MinOccurs = all.MinOccurs; 
                newAll.MaxOccurs = all.MaxOccurs;
                newAll.SourceUri = all.SourceUri; // all is the only one that might need and error message 
                newAll.LineNumber = all.LineNumber; 
                newAll.LinePosition = all.LinePosition;
                foreach (XmlSchemaElement e in all.Items) { 
                    XmlSchemaParticle p = CannonicalizeParticle(e, false, substitution);
                    if (p != XmlSchemaParticle.Empty) {
                        newAll.Items.Add(p);
                    } 
                }
                all = newAll; 
            } 
            if (all.Items.Count == 0) {
                return XmlSchemaParticle.Empty; 
            }
            else if (root && all.Items.Count == 1) {
                XmlSchemaSequence newSequence = new XmlSchemaSequence();
                newSequence.MinOccurs = all.MinOccurs; 
                newSequence.MaxOccurs = all.MaxOccurs;
                newSequence.Items.Add((XmlSchemaParticle)all.Items[0]); 
                return newSequence; 
            }
            else if (!root && all.Items.Count == 1 && all.MinOccurs == decimal.One && all.MaxOccurs == decimal.One) { 
                return (XmlSchemaParticle)all.Items[0];
            }
            else if (!root) {
                SendValidationEvent(Res.Sch_NotAllAlone, all); 
                return XmlSchemaParticle.Empty;
            } 
            else { 
                return all;
            } 
        }

        private XmlSchemaParticle CannonicalizeChoice(XmlSchemaChoice choice, bool root, bool substitution) {
            XmlSchemaChoice oldChoice = choice; 
            if (choice.Items.Count > 0) {
                XmlSchemaChoice newChoice = new XmlSchemaChoice(); 
                newChoice.MinOccurs = choice.MinOccurs; 
                newChoice.MaxOccurs = choice.MaxOccurs;
                foreach (XmlSchemaParticle p in choice.Items) { 
                    XmlSchemaParticle p1 = CannonicalizeParticle(p, false, substitution);
                    if (p1 != XmlSchemaParticle.Empty) {
                        if (p1.MinOccurs == decimal.One && p1.MaxOccurs == decimal.One && p1 is XmlSchemaChoice) {
                            foreach (XmlSchemaParticle p2 in ((XmlSchemaChoice)p1).Items) { 
                                newChoice.Items.Add(p2);
                            } 
                        } 
                        else {
                            newChoice.Items.Add(p1); 
                        }
                    }
                }
                choice = newChoice; 
            }
            if (!root && choice.Items.Count == 0) { 
                if (choice.MinOccurs != decimal.Zero) { 
                    SendValidationEvent(Res.Sch_EmptyChoice, oldChoice, XmlSeverityType.Warning);
                } 
                return XmlSchemaParticle.Empty;
            }
            else if (!root && choice.Items.Count == 1 && choice.MinOccurs == decimal.One && choice.MaxOccurs == decimal.One) {
                return (XmlSchemaParticle)choice.Items[0]; 
            }
            else { 
                return choice; 
            }
        } 

        private XmlSchemaParticle CannonicalizeSequence(XmlSchemaSequence sequence, bool root, bool substitution) {
            if (sequence.Items.Count > 0) {
                XmlSchemaSequence newSequence = new XmlSchemaSequence(); 
                newSequence.MinOccurs = sequence.MinOccurs;
                newSequence.MaxOccurs = sequence.MaxOccurs; 
                foreach (XmlSchemaParticle p in sequence.Items) { 
                    XmlSchemaParticle p1 = CannonicalizeParticle(p, false, substitution);
                    if (p1 != XmlSchemaParticle.Empty) { 
                        if (p1.MinOccurs == decimal.One && p1.MaxOccurs == decimal.One && p1 is XmlSchemaSequence) {
                            foreach (XmlSchemaParticle p2 in ((XmlSchemaSequence)p1).Items) {
                                newSequence.Items.Add(p2);
                            } 
                        }
                        else { 
                            newSequence.Items.Add(p1); 
                        }
                    } 
                }
                sequence = newSequence;
            }
            if (sequence.Items.Count == 0) { 
                return XmlSchemaParticle.Empty;
            } 
            else if (!root && sequence.Items.Count == 1 && sequence.MinOccurs == decimal.One && sequence.MaxOccurs == decimal.One) { 
                return (XmlSchemaParticle)sequence.Items[0];
            } 
            else {
                return sequence;
            }
        } 

        private bool IsValidRestriction(XmlSchemaParticle derivedParticle, XmlSchemaParticle baseParticle) { 
            if (derivedParticle == baseParticle) { 
                return true;
            } 
            else if (derivedParticle == null || derivedParticle == XmlSchemaParticle.Empty) {
                return IsParticleEmptiable(baseParticle);
            }
            else if (baseParticle == null || baseParticle == XmlSchemaParticle.Empty) { 
                return false;
            } 
            if (baseParticle is XmlSchemaElement) { 
                if (derivedParticle is XmlSchemaElement) {
                    return IsElementFromElement((XmlSchemaElement)derivedParticle, (XmlSchemaElement)baseParticle); 
                }
                else {
                    return false;
                } 
            }
            else if (baseParticle is XmlSchemaAny) { 
                if (derivedParticle is XmlSchemaElement) { 
                    return IsElementFromAny((XmlSchemaElement)derivedParticle, (XmlSchemaAny)baseParticle);
                } 
                else if (derivedParticle is XmlSchemaAny) {
                    return IsAnyFromAny((XmlSchemaAny)derivedParticle, (XmlSchemaAny)baseParticle);
                }
                else { 
                    return IsGroupBaseFromAny((XmlSchemaGroupBase)derivedParticle, (XmlSchemaAny)baseParticle);
                } 
            } 
            else if (baseParticle is XmlSchemaAll) {
                if (derivedParticle is XmlSchemaElement) { 
                    return IsElementFromGroupBase((XmlSchemaElement)derivedParticle, (XmlSchemaGroupBase)baseParticle, true);
                }
                else if (derivedParticle is XmlSchemaAll) {
                    return IsGroupBaseFromGroupBase((XmlSchemaGroupBase)derivedParticle, (XmlSchemaGroupBase)baseParticle, true); 
                }
                else if (derivedParticle is XmlSchemaSequence) { 
                    return IsSequenceFromAll((XmlSchemaSequence)derivedParticle, (XmlSchemaAll)baseParticle); 
                }
            } 
            else if (baseParticle is XmlSchemaChoice ) {
                if (derivedParticle is XmlSchemaElement) {
                    return IsElementFromGroupBase((XmlSchemaElement)derivedParticle, (XmlSchemaGroupBase)baseParticle, false);
                } 
                else if (derivedParticle is XmlSchemaChoice) {
                    return IsGroupBaseFromGroupBase((XmlSchemaGroupBase)derivedParticle, (XmlSchemaGroupBase)baseParticle, false); 
                } 
                else if (derivedParticle is XmlSchemaSequence) {
                    return IsSequenceFromChoice((XmlSchemaSequence)derivedParticle, (XmlSchemaChoice)baseParticle); 
                }
            }
            else if (baseParticle is XmlSchemaSequence) {
                if (derivedParticle is XmlSchemaElement) { 
                    return IsElementFromGroupBase((XmlSchemaElement)derivedParticle, (XmlSchemaGroupBase)baseParticle, true);
                } 
                else if (derivedParticle is XmlSchemaSequence) { 
                    return IsGroupBaseFromGroupBase((XmlSchemaGroupBase)derivedParticle, (XmlSchemaGroupBase)baseParticle, true);
                } 
            }
            else {
                Debug.Assert(false);
            } 

            return false; 
        } 

        private bool IsElementFromElement(XmlSchemaElement derivedElement, XmlSchemaElement baseElement) { 
            return  (derivedElement.QualifiedName == baseElement.QualifiedName) &&
                    (derivedElement.IsNillable == baseElement.IsNillable) &&
                    IsValidOccurrenceRangeRestriction(derivedElement, baseElement) &&
                    (baseElement.FixedValue == null || baseElement.FixedValue == derivedElement.FixedValue) && 
                    ((derivedElement.BlockResolved | baseElement.BlockResolved) ==  derivedElement.BlockResolved) &&
                    (derivedElement.ElementSchemaType != null) && (baseElement.ElementSchemaType != null) && 
                    XmlSchemaType.IsDerivedFrom(derivedElement.ElementSchemaType, baseElement.ElementSchemaType, ~XmlSchemaDerivationMethod.Restriction); 
        }
 
        private bool IsElementFromAny(XmlSchemaElement derivedElement, XmlSchemaAny baseAny) {
            return baseAny.Allows(derivedElement.QualifiedName) &&
                IsValidOccurrenceRangeRestriction(derivedElement, baseAny);
        } 

        private bool IsAnyFromAny(XmlSchemaAny derivedAny, XmlSchemaAny baseAny) { 
            return IsValidOccurrenceRangeRestriction(derivedAny, baseAny) && 
                NamespaceList.IsSubset(derivedAny.NamespaceList, baseAny.NamespaceList);
        } 

        private bool IsGroupBaseFromAny(XmlSchemaGroupBase derivedGroupBase, XmlSchemaAny baseAny) {
            decimal minOccurs, maxOccurs;
            CalculateEffectiveTotalRange(derivedGroupBase, out minOccurs, out maxOccurs); 
            if (!IsValidOccurrenceRangeRestriction(minOccurs, maxOccurs, baseAny.MinOccurs, baseAny.MaxOccurs)) {
                return false; 
            } 
            // eliminate occurrance range check
            string minOccursAny = baseAny.MinOccursString; 
            baseAny.MinOccurs = decimal.Zero;

            foreach (XmlSchemaParticle p in derivedGroupBase.Items) {
                if (!IsValidRestriction(p, baseAny)) { 
                    baseAny.MinOccursString = minOccursAny;
                    return false; 
                } 
            }
            baseAny.MinOccursString = minOccursAny; 
            return true;
        }

        private bool IsElementFromGroupBase(XmlSchemaElement derivedElement, XmlSchemaGroupBase baseGroupBase,  bool skipEmptableOnly) { 
            bool isMatched = false;
            foreach(XmlSchemaParticle baseParticle in baseGroupBase.Items) { 
                if (!isMatched) { 
                    string minOccursElement = baseParticle.MinOccursString;
                    string maxOccursElement = baseParticle.MaxOccursString; 
                    baseParticle.MinOccurs *= baseGroupBase.MinOccurs;
                    if ( baseParticle.MaxOccurs != decimal.MaxValue) {
                        if (baseGroupBase.MaxOccurs == decimal.MaxValue)
                             baseParticle.MaxOccurs = decimal.MaxValue; 
                        else
                             baseParticle.MaxOccurs *= baseGroupBase.MaxOccurs; 
                    } 
                    isMatched  = IsValidRestriction(derivedElement, baseParticle);
                    baseParticle.MinOccursString = minOccursElement; 
                    baseParticle.MaxOccursString = maxOccursElement;
                }
                else if (skipEmptableOnly && !IsParticleEmptiable(baseParticle)) {
                    return false; 
                }
            } 
            return isMatched; 
        }
 
        private bool IsGroupBaseFromGroupBase(XmlSchemaGroupBase derivedGroupBase, XmlSchemaGroupBase baseGroupBase,  bool skipEmptableOnly) {
            if (!IsValidOccurrenceRangeRestriction(derivedGroupBase, baseGroupBase) || derivedGroupBase.Items.Count > baseGroupBase.Items.Count) {
                return false;
            } 
            int count = 0;
            foreach(XmlSchemaParticle baseParticle in baseGroupBase.Items) { 
                if ((count < derivedGroupBase.Items.Count) && IsValidRestriction((XmlSchemaParticle)derivedGroupBase.Items[count], baseParticle)) { 
                    count ++;
                } 
                else if (skipEmptableOnly && !IsParticleEmptiable(baseParticle)) {
                    return false;
                }
            } 
            if (count < derivedGroupBase.Items.Count) {
                return false; 
            } 
            return true;
        } 

        private bool IsSequenceFromAll(XmlSchemaSequence derivedSequence, XmlSchemaAll baseAll) {
            if (!IsValidOccurrenceRangeRestriction(derivedSequence, baseAll) || derivedSequence.Items.Count > baseAll.Items.Count) {
                return false; 
            }
            BitSet map = new BitSet(baseAll.Items.Count); 
            foreach (XmlSchemaParticle p in derivedSequence.Items) { 
                int i = GetMappingParticle(p, baseAll.Items);
                if (i >= 0) { 
                    if (map[i]) {
                        return false;
                    }
                    else { 
                        map.Set(i);
                    } 
                } 
                else {
                    return false; 
                }
            }
            for (int i = 0; i < baseAll.Items.Count; i++) {
                if (!map[i] && !IsParticleEmptiable((XmlSchemaParticle)baseAll.Items[i])) { 
                    return false;
                } 
            } 
            return true;
        } 

        private bool IsSequenceFromChoice(XmlSchemaSequence derivedSequence, XmlSchemaChoice baseChoice) {
            decimal minOccurs, maxOccurs;
            CalculateSequenceRange(derivedSequence, out minOccurs, out maxOccurs); 
            if (!IsValidOccurrenceRangeRestriction(minOccurs, maxOccurs, baseChoice.MinOccurs, baseChoice.MaxOccurs) || derivedSequence.Items.Count > baseChoice.Items.Count) {
                return false; 
            } 
            foreach (XmlSchemaParticle particle in derivedSequence.Items) {
                if (GetMappingParticle(particle, baseChoice.Items) < 0) 
                    return false;
            }
            return true;
        } 

        private void CalculateSequenceRange(XmlSchemaSequence sequence, out decimal minOccurs, out decimal maxOccurs) { 
            minOccurs = decimal.Zero; maxOccurs = decimal.Zero; 
            foreach (XmlSchemaParticle p in sequence.Items) {
                minOccurs += p.MinOccurs; 
                if (p.MaxOccurs == decimal.MaxValue)
                    maxOccurs = decimal.MaxValue;
                else if (maxOccurs != decimal.MaxValue)
                    maxOccurs += p.MaxOccurs; 
            }
            minOccurs *= sequence.MinOccurs; 
            if (sequence.MaxOccurs == decimal.MaxValue) { 
                maxOccurs = decimal.MaxValue;
            } 
            else if (maxOccurs != decimal.MaxValue) {
                maxOccurs *= sequence.MaxOccurs;
            }
        } 

        private bool IsValidOccurrenceRangeRestriction(XmlSchemaParticle derivedParticle, XmlSchemaParticle baseParticle) { 
            return IsValidOccurrenceRangeRestriction(derivedParticle.MinOccurs, derivedParticle.MaxOccurs, baseParticle.MinOccurs, baseParticle.MaxOccurs); 
        }
 
        private bool IsValidOccurrenceRangeRestriction(decimal minOccurs, decimal maxOccurs, decimal baseMinOccurs, decimal baseMaxOccurs) {
            return (baseMinOccurs <= minOccurs) && (maxOccurs <= baseMaxOccurs);
        }
 
        private int GetMappingParticle(XmlSchemaParticle particle, XmlSchemaObjectCollection collection) {
            for (int i = 0; i < collection.Count; i++) { 
                if (IsValidRestriction(particle, (XmlSchemaParticle)collection[i])) 
                    return i;
            } 
            return -1;
        }

        private bool IsParticleEmptiable(XmlSchemaParticle particle) { 
            decimal minOccurs, maxOccurs;
            CalculateEffectiveTotalRange(particle, out minOccurs, out maxOccurs); 
            return minOccurs == decimal.Zero; 
        }
 
        private void CalculateEffectiveTotalRange(XmlSchemaParticle particle, out decimal minOccurs, out decimal maxOccurs) {
            if (particle is XmlSchemaElement || particle is XmlSchemaAny) {
                minOccurs = particle.MinOccurs;
                maxOccurs = particle.MaxOccurs; 
            }
            else if (particle is XmlSchemaChoice) { 
                if (((XmlSchemaChoice)particle).Items.Count == 0) { 
                    minOccurs = maxOccurs = decimal.Zero;
                } 
                else {
                    minOccurs = decimal.MaxValue;
                    maxOccurs = decimal.Zero;
                    foreach (XmlSchemaParticle p in ((XmlSchemaChoice)particle).Items) { 
                        decimal min, max;
                        CalculateEffectiveTotalRange(p, out min, out max); 
                        if (min < minOccurs) { 
                            minOccurs = min;
                        } 
                        if (max > maxOccurs) {
                            maxOccurs = max;
                        }
                    } 
                    minOccurs *= particle.MinOccurs;
                    if (maxOccurs != decimal.MaxValue) { 
                        if (particle.MaxOccurs == decimal.MaxValue) 
                            maxOccurs = decimal.MaxValue;
                        else 
                            maxOccurs *= particle.MaxOccurs;
                    }
                }
            } 
            else {
                XmlSchemaObjectCollection collection = ((XmlSchemaGroupBase)particle).Items; 
                if (collection.Count == 0) { 
                    minOccurs = maxOccurs = decimal.Zero;
                } 
                else {
                    minOccurs = 0;
                    maxOccurs = 0;
                    foreach (XmlSchemaParticle p in collection) { 
                        decimal min, max;
                        CalculateEffectiveTotalRange(p, out min, out max); 
                        minOccurs += min; 
                        if (maxOccurs != decimal.MaxValue) {
                            if (max == decimal.MaxValue) 
                                maxOccurs = decimal.MaxValue;
                            else
                                maxOccurs += max;
                        } 
                    }
                    minOccurs *= particle.MinOccurs; 
                    if (maxOccurs != decimal.MaxValue) { 
                        if (particle.MaxOccurs == decimal.MaxValue)
                            maxOccurs = decimal.MaxValue; 
                        else
                            maxOccurs *= particle.MaxOccurs;
                    }
                } 
            }
        } 
 
        private void PushComplexType(XmlSchemaComplexType complexType) {
            this.complexTypeStack.Push(complexType); 
        }

        private XmlSchemaContentType GetSchemaContentType(XmlSchemaComplexType complexType, XmlSchemaComplexContent complexContent, XmlSchemaParticle particle) {
            if ((complexContent != null && complexContent.IsMixed) || 
                (complexContent == null && complexType.IsMixed)) {
                return XmlSchemaContentType.Mixed; 
            } 
            else if (particle != null && !particle.IsEmpty) {
                return XmlSchemaContentType.ElementOnly; 
            }
            else {
                return XmlSchemaContentType.Empty;
            } 
        }
 
        private void CompileAttributeGroup(XmlSchemaAttributeGroup attributeGroup) { 
            if (attributeGroup.IsProcessing) {
                SendValidationEvent(Res.Sch_AttributeGroupCircularRef, attributeGroup); 
                return;
            }
            if (attributeGroup.AttributeUses.Count > 0) {// already checked
                return; 
            }
            attributeGroup.IsProcessing = true; 
            XmlSchemaAnyAttribute anyAttribute = attributeGroup.AnyAttribute; 
            foreach (XmlSchemaObject obj in attributeGroup.Attributes) {
                if (obj is XmlSchemaAttribute) { 
                    XmlSchemaAttribute attribute = (XmlSchemaAttribute)obj;
                    if (attribute.Use != XmlSchemaUse.Prohibited) {
                        CompileAttribute(attribute);
                    } 
                    if (attributeGroup.AttributeUses[attribute.QualifiedName] == null) {
                        attributeGroup.AttributeUses.Add(attribute.QualifiedName, attribute); 
                    } 
                    else  {
                        SendValidationEvent(Res.Sch_DupAttributeUse, attribute.QualifiedName.ToString(), attribute); 
                    }
                }
                else { // XmlSchemaAttributeGroupRef
                    XmlSchemaAttributeGroupRef attributeGroupRef = (XmlSchemaAttributeGroupRef)obj; 
                    XmlSchemaAttributeGroup attributeGroupResolved;
                    if (attributeGroup.Redefined != null && attributeGroupRef.RefName == attributeGroup.Redefined.QualifiedName) { 
                        attributeGroupResolved = (XmlSchemaAttributeGroup)attributeGroup.Redefined; 
                    }
                    else { 
                        attributeGroupResolved = (XmlSchemaAttributeGroup)this.schema.AttributeGroups[attributeGroupRef.RefName];
                    }
                    if (attributeGroupResolved != null) {
                        CompileAttributeGroup(attributeGroupResolved); 
                        foreach (XmlSchemaAttribute attribute in attributeGroupResolved.AttributeUses.Values) {
                            if (attributeGroup.AttributeUses[attribute.QualifiedName] == null) { 
                                attributeGroup.AttributeUses.Add(attribute.QualifiedName, attribute); 
                            }
                            else { 
                                SendValidationEvent(Res.Sch_DupAttributeUse, attribute.QualifiedName.ToString(), attribute);
                            }
                        }
                        anyAttribute = CompileAnyAttributeIntersection(anyAttribute, attributeGroupResolved.AttributeWildcard); 
                    }
                    else { 
                        SendValidationEvent(Res.Sch_UndefAttributeGroupRef, attributeGroupRef.RefName.ToString(), attributeGroupRef); 
                    }
                } 
            }
            attributeGroup.AttributeWildcard = anyAttribute;
            attributeGroup.IsProcessing = false;
 
        }
 
        private void CompileLocalAttributes(XmlSchemaComplexType baseType, XmlSchemaComplexType derivedType, XmlSchemaObjectCollection attributes, XmlSchemaAnyAttribute anyAttribute, XmlSchemaDerivationMethod derivedBy) { 
            XmlSchemaAnyAttribute baseAttributeWildcard = baseType != null ? baseType.AttributeWildcard : null;
            foreach (XmlSchemaObject obj in attributes) { 
                if (obj is XmlSchemaAttribute) {
                    XmlSchemaAttribute attribute = (XmlSchemaAttribute)obj;
                    if (attribute.Use != XmlSchemaUse.Prohibited) {
                        CompileAttribute(attribute); 
                    }
                    if (attribute.Use != XmlSchemaUse.Prohibited || 
                        (attribute.Use == XmlSchemaUse.Prohibited && derivedBy == XmlSchemaDerivationMethod.Restriction && baseType != XmlSchemaComplexType.AnyType)) { 

                        if (derivedType.AttributeUses[attribute.QualifiedName] == null) { 
                            derivedType.AttributeUses.Add(attribute.QualifiedName, attribute);
                        }
                        else  {
                            SendValidationEvent(Res.Sch_DupAttributeUse, attribute.QualifiedName.ToString(), attribute); 
                        }
                    } 
                    else { 
                        SendValidationEvent(Res.Sch_AttributeIgnored, attribute.QualifiedName.ToString(), attribute, XmlSeverityType.Warning);
                    } 

                }
                else { // is XmlSchemaAttributeGroupRef
                    XmlSchemaAttributeGroupRef attributeGroupRef = (XmlSchemaAttributeGroupRef)obj; 
                    XmlSchemaAttributeGroup attributeGroup = (XmlSchemaAttributeGroup)this.schema.AttributeGroups[attributeGroupRef.RefName];
                    if (attributeGroup != null) { 
                        CompileAttributeGroup(attributeGroup); 
                        foreach (XmlSchemaAttribute attribute in attributeGroup.AttributeUses.Values) {
                          if (attribute.Use != XmlSchemaUse.Prohibited || 
                             (attribute.Use == XmlSchemaUse.Prohibited && derivedBy == XmlSchemaDerivationMethod.Restriction && baseType != XmlSchemaComplexType.AnyType)) {
                            if (derivedType.AttributeUses[attribute.QualifiedName] == null) {
                                derivedType.AttributeUses.Add(attribute.QualifiedName, attribute);
                            } 
                            else {
                                SendValidationEvent(Res.Sch_DupAttributeUse, attribute.QualifiedName.ToString(), attributeGroupRef); 
                            } 
                          }
                          else { 
                            SendValidationEvent(Res.Sch_AttributeIgnored, attribute.QualifiedName.ToString(), attribute, XmlSeverityType.Warning);
                          }

                        } 
                        anyAttribute = CompileAnyAttributeIntersection(anyAttribute, attributeGroup.AttributeWildcard);
                    } 
                    else { 
                        SendValidationEvent(Res.Sch_UndefAttributeGroupRef, attributeGroupRef.RefName.ToString(), attributeGroupRef);
                    } 
                }
            }

            // check derivation rules 
            if (baseType != null) {
                if (derivedBy == XmlSchemaDerivationMethod.Extension) { 
                    derivedType.SetAttributeWildcard(CompileAnyAttributeUnion(anyAttribute, baseAttributeWildcard)); 
                    foreach(XmlSchemaAttribute attributeBase in baseType.AttributeUses.Values) {
                        XmlSchemaAttribute attribute = (XmlSchemaAttribute)derivedType.AttributeUses[attributeBase.QualifiedName]; 
                        if (attribute != null) {
                            Debug.Assert(attribute.Use != XmlSchemaUse.Prohibited);
                            if (attribute.AttributeSchemaType != attributeBase.AttributeSchemaType || attributeBase.Use == XmlSchemaUse.Prohibited) {
                                SendValidationEvent(Res.Sch_InvalidAttributeExtension, attribute); 
                            }
                        } 
                        else { 
                            derivedType.AttributeUses.Add(attributeBase.QualifiedName, attributeBase);
                        } 
                    }
                }
                else {  // derivedBy == XmlSchemaDerivationMethod.Restriction
                    // Schema Component Constraint: Derivation Valid (Restriction, Complex) 
                    if ((anyAttribute != null) && (baseAttributeWildcard == null || !XmlSchemaAnyAttribute.IsSubset(anyAttribute, baseAttributeWildcard))) {
                        SendValidationEvent(Res.Sch_InvalidAnyAttributeRestriction, derivedType); 
                    } 
                    else {
                        derivedType.SetAttributeWildcard(anyAttribute); //complete wildcard 
                    }

                    // Add form the base
                    foreach(XmlSchemaAttribute attributeBase in baseType.AttributeUses.Values) { 
                        XmlSchemaAttribute attribute = (XmlSchemaAttribute)derivedType.AttributeUses[attributeBase.QualifiedName];
                        if (attribute == null) { 
                            derivedType.AttributeUses.Add(attributeBase.QualifiedName, attributeBase); 
                        }
                        else { 
                            if (attributeBase.Use == XmlSchemaUse.Prohibited && attribute.Use != XmlSchemaUse.Prohibited) {
#if DEBUG
                                string position = string.Empty;
                                if (derivedType.SourceUri != null) { 
                                    position = " in " + derivedType.SourceUri + "(" + derivedType.LineNumber + ", " + derivedType.LinePosition + ")";
                                } 
                                Debug.WriteLineIf(DiagnosticsSwitches.XmlSchema.TraceError, "Invalid complexType attributes restriction" + position); 
                                Debug.WriteLineIf(DiagnosticsSwitches.XmlSchema.TraceError, "     Base    " + DumpAttributes(baseType.AttributeUses, baseType.AttributeWildcard));
                                Debug.WriteLineIf(DiagnosticsSwitches.XmlSchema.TraceError, "     Derived " + DumpAttributes(derivedType.AttributeUses, derivedType.AttributeWildcard)); 
#endif
                                SendValidationEvent(Res.Sch_AttributeRestrictionProhibited, attribute);
                            }
                            else if (attribute.Use == XmlSchemaUse.Prohibited) { 
                                continue;
                            } 
                            else if (attributeBase.AttributeSchemaType == null || attribute.AttributeSchemaType == null || !XmlSchemaType.IsDerivedFrom(attribute.AttributeSchemaType, attributeBase.AttributeSchemaType, XmlSchemaDerivationMethod.Empty)) { 
                                SendValidationEvent(Res.Sch_AttributeRestrictionInvalid, attribute);
                            } 
                        }
                    }

                    // Check additional ones are valid restriction of base's wildcard 
                    foreach(XmlSchemaAttribute attribute in derivedType.AttributeUses.Values) {
                        XmlSchemaAttribute attributeBase = (XmlSchemaAttribute)baseType.AttributeUses[attribute.QualifiedName]; 
                        if (attributeBase != null) { 
                            continue;
                        } 
                        if (baseAttributeWildcard == null || !baseAttributeWildcard.Allows(attribute.QualifiedName)) {
#if DEBUG
                            string position = string.Empty;
                            if (derivedType.SourceUri != null) { 
                                position = " in " + derivedType.SourceUri + "(" + derivedType.LineNumber + ", " + derivedType.LinePosition + ")";
                            } 
                            Debug.WriteLineIf(DiagnosticsSwitches.XmlSchema.TraceError, "Invalid complexType attributes restriction" + position); 
                            Debug.WriteLineIf(DiagnosticsSwitches.XmlSchema.TraceError, "     Base    " + DumpAttributes(baseType.AttributeUses, baseType.AttributeWildcard));
                            Debug.WriteLineIf(DiagnosticsSwitches.XmlSchema.TraceError, "     Derived " + DumpAttributes(derivedType.AttributeUses, derivedType.AttributeWildcard)); 
#endif
                            SendValidationEvent(Res.Sch_AttributeRestrictionInvalidFromWildcard, attribute);
                        }
                    } 
                }
            } 
            else { 
                derivedType.SetAttributeWildcard(anyAttribute);
            } 
       }


#if DEBUG 
        private string DumpAttributes(XmlSchemaObjectTable attributeUses, XmlSchemaAnyAttribute attributeWildcard) {
            StringBuilder sb = new StringBuilder(); 
            sb.Append("["); 
            bool first = true;
            foreach (XmlSchemaAttribute attribute in attributeUses.Values) { 
                if (attribute.Use != XmlSchemaUse.Prohibited) {
                    if (first) {
                        first = false;
                    } 
                    else {
                        sb.Append(" "); 
                    } 
                    sb.Append(attribute.QualifiedName.Name);
                    if (attribute.Use == XmlSchemaUse.Optional) { 
                        sb.Append("?");
                    }
                }
            } 
            if (attributeWildcard != null) {
                if (attributeUses.Count != 0) { 
                    sb.Append(" "); 
                }
                sb.Append("<"); 
                sb.Append(attributeWildcard.NamespaceList.ToString());
                sb.Append(">");
            }
            sb.Append("] - ["); 
            first = true;
            foreach (XmlSchemaAttribute attribute in attributeUses.Values) { 
                if (attribute.Use == XmlSchemaUse.Prohibited) { 
                    if (first) {
                        first = false; 
                    }
                    else {
                        sb.Append(" ");
                    } 
                    sb.Append(attribute.QualifiedName.Name);
                } 
            } 
            sb.Append("]");
            return sb.ToString(); 
        }
#endif

        private XmlSchemaAnyAttribute CompileAnyAttributeUnion(XmlSchemaAnyAttribute a, XmlSchemaAnyAttribute b) { 
            if (a == null) {
                return b; 
            } 
            else if (b == null) {
                return a; 
            }
            else {
                XmlSchemaAnyAttribute attribute = XmlSchemaAnyAttribute.Union(a, b, true); //true for v1Compat
                if (attribute == null) { 
                    SendValidationEvent(Res.Sch_UnexpressibleAnyAttribute, a);
                } 
                return attribute; 
            }
 
        }

        private XmlSchemaAnyAttribute CompileAnyAttributeIntersection(XmlSchemaAnyAttribute a, XmlSchemaAnyAttribute b) {
            if (a == null) { 
                return b;
            } 
            else if (b == null) { 
                return a;
            } 
            else {
                XmlSchemaAnyAttribute attribute = XmlSchemaAnyAttribute.Intersection(a, b, true); //true for v1Compat
                if (attribute == null) {
                    SendValidationEvent(Res.Sch_UnexpressibleAnyAttribute, a); 
                }
                return attribute; 
            } 
        }
 
         private void CompileAttribute(XmlSchemaAttribute xa) {
            if (xa.IsProcessing) {
                SendValidationEvent(Res.Sch_AttributeCircularRef, xa);
                return; 
            }
            if (xa.AttDef != null) { //already compiled? 
                return; 
            }
            xa.IsProcessing = true; 
            SchemaAttDef decl = null;
            try {
                if (!xa.RefName.IsEmpty) {
                    XmlSchemaAttribute a = (XmlSchemaAttribute)this.schema.Attributes[xa.RefName]; 
                    if (a == null) {
                        throw new XmlSchemaException(Res.Sch_UndeclaredAttribute, xa.RefName.ToString(), xa); 
                    } 
                    CompileAttribute(a);
                    if (a.AttDef == null) { 
                        throw new XmlSchemaException(Res.Sch_RefInvalidAttribute, xa.RefName.ToString(), xa);
                    }
                    decl = a.AttDef.Clone();
                    if(decl.Datatype != null) { 
                        if(a.FixedValue != null) {
                            if(xa.DefaultValue != null) { 
                                throw new XmlSchemaException(Res.Sch_FixedDefaultInRef, xa.RefName.ToString(), xa); 
                            }
                            else if(xa.FixedValue != null ) { 
                                if (xa.FixedValue != a.FixedValue) {
                                    throw new XmlSchemaException(Res.Sch_FixedInRef, xa.RefName.ToString(), xa);
                                }
                            } 
                            else {
                                decl.Presence = SchemaDeclBase.Use.Fixed; 
                                decl.DefaultValueRaw = decl.DefaultValueExpanded = a.FixedValue; 
                                decl.DefaultValueTyped = decl.Datatype.ParseValue(decl.DefaultValueRaw, NameTable, new SchemaNamespaceManager(xa), true);
                            } 
                        }
                        else if (a.DefaultValue != null) {
                            if(xa.DefaultValue == null && xa.FixedValue == null) {
                                decl.Presence = SchemaDeclBase.Use.Default; 
                                decl.DefaultValueRaw = decl.DefaultValueExpanded = a.DefaultValue;
                                decl.DefaultValueTyped = decl.Datatype.ParseValue(decl.DefaultValueRaw, NameTable, new SchemaNamespaceManager(xa), true); 
                            } 
                        }
                    } 
                    xa.SetAttributeType(a.AttributeSchemaType);
                }
                else {
                    decl = new SchemaAttDef(xa.QualifiedName, xa.Prefix); 
                    if (xa.SchemaType != null) {
                        CompileSimpleType(xa.SchemaType); 
                        xa.SetAttributeType(xa.SchemaType); 
                        decl.SchemaType = xa.SchemaType;
                        decl.Datatype = xa.SchemaType.Datatype; 
                    }
                    else if (!xa.SchemaTypeName.IsEmpty) {
                        XmlSchemaSimpleType simpleType = GetSimpleType(xa.SchemaTypeName);
                        if (simpleType != null) { 
                            xa.SetAttributeType(simpleType);
                            decl.Datatype = simpleType.Datatype; 
                            decl.SchemaType = simpleType; 
                        }
                        else { 
                            throw new XmlSchemaException(Res.Sch_UndeclaredSimpleType, xa.SchemaTypeName.ToString(), xa);
                        }
                    }
                    else { 
                        decl.SchemaType = DatatypeImplementation.AnySimpleType;
                        decl.Datatype = DatatypeImplementation.AnySimpleType.Datatype; 
                        xa.SetAttributeType(DatatypeImplementation.AnySimpleType); 
                    }
                } 
                if (decl.Datatype != null) {
                    decl.Datatype.VerifySchemaValid(this.schema.Notations, xa);
                }
                if (xa.DefaultValue != null || xa.FixedValue != null) { 
                    if (xa.DefaultValue != null) {
                        decl.Presence = SchemaDeclBase.Use.Default; 
                        decl.DefaultValueRaw = decl.DefaultValueExpanded = xa.DefaultValue; 
                    }
                    else { 
                        decl.Presence = SchemaDeclBase.Use.Fixed;
                        decl.DefaultValueRaw = decl.DefaultValueExpanded = xa.FixedValue;
                    }
                    if(decl.Datatype != null) { 
                        decl.DefaultValueTyped = decl.Datatype.ParseValue(decl.DefaultValueRaw, NameTable, new SchemaNamespaceManager(xa), true);
                    } 
                } 
                else {
                    switch (xa.Use) { 
                        case XmlSchemaUse.None:
                        case XmlSchemaUse.Optional:
                            decl.Presence = SchemaDeclBase.Use.Implied;
                            break; 
                        case XmlSchemaUse.Required:
                            decl.Presence = SchemaDeclBase.Use.Required; 
                            break; 
                        case XmlSchemaUse.Prohibited:
                            break; 
                    }
                }
                decl.SchemaAttribute = xa; //So this is available for PSVI
                xa.AttDef = decl; 
            }
            catch (XmlSchemaException e) { 
                if (e.SourceSchemaObject == null) { 
                    e.SetSource(xa);
                } 
                SendValidationEvent(e);
                xa.AttDef = SchemaAttDef.Empty;
            }
            finally { 
                xa.IsProcessing = false;
            } 
        } 

        private void CompileIdentityConstraint (XmlSchemaIdentityConstraint xi) { 
            if (xi.IsProcessing) {
                xi.CompiledConstraint = CompiledIdentityConstraint.Empty;
                SendValidationEvent(Res.Sch_IdentityConstraintCircularRef, xi);
                return; 
            }
 
            if (xi.CompiledConstraint != null) { 
                return;
            } 

            xi.IsProcessing = true;
            CompiledIdentityConstraint compic = null;
            try { 
                SchemaNamespaceManager xnmgr = new SchemaNamespaceManager(xi);
                compic = new CompiledIdentityConstraint(xi, xnmgr); 
                if (xi is XmlSchemaKeyref) { 
                    XmlSchemaIdentityConstraint ic = (XmlSchemaIdentityConstraint)this.schema.IdentityConstraints[((XmlSchemaKeyref)xi).Refer];
                    if (ic == null) { 
                        throw new XmlSchemaException(Res.Sch_UndeclaredIdentityConstraint, ((XmlSchemaKeyref)xi).Refer.ToString(), xi);
                    }
                    CompileIdentityConstraint(ic);
                    if (ic.CompiledConstraint == null) { 
                        throw new XmlSchemaException(Res.Sch_RefInvalidIdentityConstraint, ((XmlSchemaKeyref)xi).Refer.ToString(), xi);
                    } 
                    // keyref has the different cardinality with the key it referred 
                    if (ic.Fields.Count != xi.Fields.Count) {
                        throw new XmlSchemaException(Res.Sch_RefInvalidCardin, xi.QualifiedName.ToString(), xi); 
                    }
                    // keyref can only refer to key/unique
                    if (ic.CompiledConstraint.Role == CompiledIdentityConstraint.ConstraintRole.Keyref) {
                        throw new XmlSchemaException(Res.Sch_ReftoKeyref, xi.QualifiedName.ToString(), xi); 
                    }
                } 
                xi.CompiledConstraint = compic; 
            }
            catch (XmlSchemaException e) { 
                if (e.SourceSchemaObject == null) {
                    e.SetSource(xi);
                }
                SendValidationEvent(e); 
                xi.CompiledConstraint = CompiledIdentityConstraint.Empty;
                // empty is better than null here, stop quickly when circle referencing 
            } 
            finally {
                xi.IsProcessing = false; 
            }

        }
 
        private void CompileElement(XmlSchemaElement xe) {
            if (xe.IsProcessing) { 
                SendValidationEvent(Res.Sch_ElementCircularRef, xe); 
                return;
            } 
            if (xe.ElementDecl != null) {
                return;
            }
            xe.IsProcessing = true; 
            SchemaElementDecl decl = null;
            try { 
                if (!xe.RefName.IsEmpty) { 
                    XmlSchemaElement e = (XmlSchemaElement)this.schema.Elements[xe.RefName];
                    if (e == null) { 
                        throw new XmlSchemaException(Res.Sch_UndeclaredElement, xe.RefName.ToString(), xe);
                    }
                    CompileElement(e);
                    if (e.ElementDecl == null) { 
                        throw new XmlSchemaException(Res.Sch_RefInvalidElement, xe.RefName.ToString(), xe);
                    } 
                    xe.SetElementType(e.ElementSchemaType); 
                    decl = e.ElementDecl.Clone();
                } 
                else {
                    if (xe.SchemaType != null) {
                        xe.SetElementType(xe.SchemaType);
                    } 
                    else if (!xe.SchemaTypeName.IsEmpty) {
                        xe.SetElementType(GetAnySchemaType(xe.SchemaTypeName)); 
                        if (xe.ElementSchemaType == null) { 
                            throw new XmlSchemaException(Res.Sch_UndeclaredType, xe.SchemaTypeName.ToString(), xe);
                        } 
                    }
                    else  if (!xe.SubstitutionGroup.IsEmpty) {
                        XmlSchemaElement examplar = (XmlSchemaElement)this.schema.Elements[xe.SubstitutionGroup];
                        if (examplar == null) { 
                            throw new XmlSchemaException(Res.Sch_UndeclaredEquivClass, xe.SubstitutionGroup.Name.ToString(CultureInfo.InvariantCulture), xe);
                        } 
                        if (examplar.IsProcessing) { //Circular subst group; already detected by now 
                            return;
                        } 
                        CompileElement(examplar);
                        if (examplar.ElementDecl == null) { //If head is invalid, fall back to AnyType
                            xe.SetElementType(XmlSchemaComplexType.AnyType);
                            decl = XmlSchemaComplexType.AnyType.ElementDecl.Clone(); 
                        }
                        else { 
                            xe.SetElementType(examplar.ElementSchemaType); 
                            decl = examplar.ElementDecl.Clone();
                        } 
                    }
                    else {
                        xe.SetElementType(XmlSchemaComplexType.AnyType);
                        decl = XmlSchemaComplexType.AnyType.ElementDecl.Clone(); 
                    }
 
                    if (decl == null) { 
                        Debug.Assert(xe.ElementSchemaType != null);
                        if (xe.ElementSchemaType is XmlSchemaComplexType) { 
                            XmlSchemaComplexType complexType = (XmlSchemaComplexType)xe.ElementSchemaType;
                            CompileComplexType(complexType);
                            if (complexType.ElementDecl != null) {
                                decl = complexType.ElementDecl.Clone(); 
//                                decl.LocalElements = complexType.LocalElementDecls;
                            } 
                        } 
                        else if (xe.ElementSchemaType is XmlSchemaSimpleType) {
                            XmlSchemaSimpleType simpleType = (XmlSchemaSimpleType)xe.ElementSchemaType; 
                            CompileSimpleType(simpleType);
                            if (simpleType.ElementDecl != null) {
                                decl = simpleType.ElementDecl.Clone();
                            } 
                        }
                    } 
                    decl.Name = xe.QualifiedName; 
                    decl.IsAbstract = xe.IsAbstract;
                    XmlSchemaComplexType ct = xe.ElementSchemaType as XmlSchemaComplexType; 
                    if (ct != null) {
                        decl.IsAbstract |= ct.IsAbstract;
                    }
                    decl.IsNillable = xe.IsNillable; 
                    decl.Block |= xe.BlockResolved;
                } 
                if (decl.Datatype != null) { 
                    decl.Datatype.VerifySchemaValid(this.schema.Notations, xe);
                } 

                if (xe.DefaultValue != null || xe.FixedValue != null) {
                    if (decl.ContentValidator != null) {
                        if (decl.ContentValidator.ContentType == XmlSchemaContentType.TextOnly) { 
                            if (xe.DefaultValue != null) {
                                decl.Presence = SchemaDeclBase.Use.Default; 
                                decl.DefaultValueRaw = xe.DefaultValue; 
                            }
                            else { 
                                decl.Presence = SchemaDeclBase.Use.Fixed;
                                decl.DefaultValueRaw = xe.FixedValue;
                            }
                            if (decl.Datatype != null) { 
                                decl.DefaultValueTyped = decl.Datatype.ParseValue(decl.DefaultValueRaw, NameTable, new SchemaNamespaceManager(xe), true);
                            } 
                        } 
                        else if (decl.ContentValidator.ContentType != XmlSchemaContentType.Mixed || !decl.ContentValidator.IsEmptiable) {
                            throw new XmlSchemaException(Res.Sch_ElementCannotHaveValue, xe); 
                        }
                    }
                }
                if (xe.HasConstraints) { 
                    XmlSchemaObjectCollection constraints = xe.Constraints;
                    CompiledIdentityConstraint[] compiledConstraints = new CompiledIdentityConstraint[constraints.Count]; 
                    int idx = 0; 
                    foreach(XmlSchemaIdentityConstraint constraint in constraints) {
                        CompileIdentityConstraint (constraint); 
                        compiledConstraints[idx ++] = constraint.CompiledConstraint;
                    }
                    decl.Constraints = compiledConstraints;
                } 
                decl.SchemaElement = xe; //So this is available for PSVI
                xe.ElementDecl = decl; 
            } 
            catch (XmlSchemaException e) {
                if (e.SourceSchemaObject == null) { 
                    e.SetSource(xe);
                }
                SendValidationEvent(e);
                xe.ElementDecl = SchemaElementDecl.Empty; 
            }
            finally { 
                xe.IsProcessing = false; 
            }
        } 

        private ContentValidator CompileComplexContent(XmlSchemaComplexType complexType) {
            if (complexType.ContentType == XmlSchemaContentType.Empty) {
                return ContentValidator.Empty; 
            }
            else if (complexType.ContentType == XmlSchemaContentType.TextOnly) { 
                return ContentValidator.TextOnly; 
            }
            XmlSchemaParticle particle = complexType.ContentTypeParticle; 
            if (particle == null || particle == XmlSchemaParticle.Empty) {
                if (complexType.ContentType == XmlSchemaContentType.ElementOnly) {
                    return ContentValidator.Empty;
                } 
                else {
                    return ContentValidator.Mixed; 
                } 
            }
            PushComplexType(complexType); 
            if (particle is XmlSchemaAll) {
                XmlSchemaAll all = (XmlSchemaAll)particle;
                AllElementsContentValidator contentValidator = new AllElementsContentValidator(complexType.ContentType, all.Items.Count, all.MinOccurs == decimal.Zero);
                foreach (XmlSchemaElement localElement in all.Items) { 
                    if (!contentValidator.AddElement(localElement.QualifiedName, localElement, localElement.MinOccurs == decimal.Zero)) {
                       SendValidationEvent(Res.Sch_DupElement, localElement.QualifiedName.ToString(), localElement); 
                    } 
                }
                return contentValidator; 
            }
            else {
                ParticleContentValidator contentValidator = new ParticleContentValidator(complexType.ContentType);
#if DEBUG 
                string name = complexType.Name != null ? complexType.Name : string.Empty;
                Debug.WriteLineIf(DiagnosticsSwitches.XmlSchema.TraceVerbose, "CompileComplexContent: "+ name  + DumpContentModel(particle)); 
#endif 
                try {
                    contentValidator.Start(); 
                    BuildParticleContentModel(contentValidator, particle);
                    return contentValidator.Finish(compileContentModel);
                }
                catch(UpaException e) { 
                    if (e.Particle1 is XmlSchemaElement) {
                        if (e.Particle2 is XmlSchemaElement) { 
                            SendValidationEvent(Res.Sch_NonDeterministic, ((XmlSchemaElement)e.Particle1).QualifiedName.ToString(), (XmlSchemaElement)e.Particle2); 
                        }
                        else { 
                            SendValidationEvent(Res.Sch_NonDeterministicAnyEx, ((XmlSchemaAny)e.Particle2).NamespaceList.ToString(), ((XmlSchemaElement)e.Particle1).QualifiedName.ToString(), (XmlSchemaAny)e.Particle2);
                        }
                    }
                    else { 
                        if (e.Particle2 is XmlSchemaElement) {
                            SendValidationEvent(Res.Sch_NonDeterministicAnyEx, ((XmlSchemaAny)e.Particle1).NamespaceList.ToString(), ((XmlSchemaElement)e.Particle2).QualifiedName.ToString(), (XmlSchemaAny)e.Particle1); 
                        } 
                        else {
                            SendValidationEvent(Res.Sch_NonDeterministicAnyAny, ((XmlSchemaAny)e.Particle1).NamespaceList.ToString(), ((XmlSchemaAny)e.Particle2).NamespaceList.ToString() ,(XmlSchemaAny)e.Particle1); 
                        }
                    }
                    return XmlSchemaComplexType.AnyTypeContentValidator;
                } 
                catch(NotSupportedException) {
                    SendValidationEvent(Res.Sch_ComplexContentModel, complexType, XmlSeverityType.Warning); 
                    return XmlSchemaComplexType.AnyTypeContentValidator; 
                }
            } 
        }

#if DEBUG
        private string DumpContentModel(XmlSchemaParticle particle) { 
            StringBuilder sb = new StringBuilder();
            DumpContentModelTo(sb, particle); 
            return sb.ToString(); 
        }
 
        private void DumpContentModelTo(StringBuilder sb, XmlSchemaParticle particle) {
            if (particle is XmlSchemaElement) {
                sb.Append(((XmlSchemaElement)particle).QualifiedName);
            } 
            else if (particle is XmlSchemaAny) {
                sb.Append("<"); 
                sb.Append(((XmlSchemaAny)particle).NamespaceList.ToString()); 
                sb.Append(">");
            } 
            else if (particle is XmlSchemaAll) {
                XmlSchemaAll all = (XmlSchemaAll)particle;
                sb.Append("[");
                bool first = true; 
                foreach (XmlSchemaElement localElement in all.Items) {
                    if (first) { 
                        first = false; 
                    }
                    else { 
                        sb.Append(", ");
                    }
                    sb.Append(localElement.QualifiedName.Name);
                    if (localElement.MinOccurs == decimal.Zero) { 
                        sb.Append("?");
                    } 
                } 
                sb.Append("]");
            } 
            else if (particle is XmlSchemaGroupBase) {
                XmlSchemaGroupBase gb = (XmlSchemaGroupBase)particle;
                sb.Append("(");
                string delimeter = (particle is XmlSchemaChoice) ? " | " : ", "; 
                bool first = true;
                foreach (XmlSchemaParticle p in gb.Items) { 
                    if (first) { 
                        first = false;
                    } 
                    else {
                        sb.Append(delimeter);
                    }
                    DumpContentModelTo(sb, p); 
                }
                sb.Append(")"); 
            } else { 
                Debug.Assert(particle == XmlSchemaParticle.Empty);
                sb.Append("<>"); 
            }
            if (particle.MinOccurs == decimal.One && particle.MaxOccurs == decimal.One) {
                // nothing
            } 
            else if (particle.MinOccurs == decimal.Zero && particle.MaxOccurs == decimal.One) {
                sb.Append("?"); 
            } 
            else if (particle.MinOccurs == decimal.Zero && particle.MaxOccurs == decimal.MaxValue) {
                sb.Append("*"); 
            }
            else if (particle.MinOccurs == decimal.One && particle.MaxOccurs == decimal.MaxValue) {
                sb.Append("+");
            } 
            else {
                sb.Append("{" + particle.MinOccurs.ToString(NumberFormatInfo.InvariantInfo) +", " + particle.MaxOccurs.ToString(NumberFormatInfo.InvariantInfo) + "}"); 
            } 
        }
#endif 

        private void BuildParticleContentModel(ParticleContentValidator contentValidator, XmlSchemaParticle particle) {
            if (particle is XmlSchemaElement) {
                XmlSchemaElement element = (XmlSchemaElement)particle; 
                contentValidator.AddName(element.QualifiedName, element);
            } 
            else if (particle is XmlSchemaAny) { 
                XmlSchemaAny any = (XmlSchemaAny)particle;
                contentValidator.AddNamespaceList(any.NamespaceList, any); 
            }
            else if (particle is XmlSchemaGroupBase) {
                XmlSchemaObjectCollection particles = ((XmlSchemaGroupBase)particle).Items;
                bool isChoice = particle is XmlSchemaChoice; 
                contentValidator.OpenGroup();
                bool first = true; 
                foreach (XmlSchemaParticle p in particles) { 
                    Debug.Assert(!p.IsEmpty);
                    if (first) { 
                        first = false;
                    }
                    else if (isChoice) {
                        contentValidator.AddChoice(); 
                    }
                    else { 
                        contentValidator.AddSequence(); 
                    }
                    BuildParticleContentModel(contentValidator, p); 
                }
                contentValidator.CloseGroup();
            }
            else { 
                Debug.Assert(false);
            } 
            if (particle.MinOccurs == decimal.One && particle.MaxOccurs == decimal.One) { 
                // nothing
            } 
            else if (particle.MinOccurs == decimal.Zero && particle.MaxOccurs == decimal.One) {
                contentValidator.AddQMark();
            }
            else if (particle.MinOccurs == decimal.Zero && particle.MaxOccurs == decimal.MaxValue) { 
                contentValidator.AddStar();
            } 
            else if (particle.MinOccurs == decimal.One && particle.MaxOccurs == decimal.MaxValue) { 
                contentValidator.AddPlus();
            } 
            else {
                contentValidator.AddLeafRange(particle.MinOccurs, particle.MaxOccurs);
            }
        } 

        private void CompileParticleElements(XmlSchemaComplexType complexType, XmlSchemaParticle particle) { 
            if (particle is XmlSchemaElement) { 
                XmlSchemaElement localElement = (XmlSchemaElement)particle;
                CompileElement(localElement); 
                if (complexType.LocalElements[localElement.QualifiedName] == null) {
                    complexType.LocalElements.Add(localElement.QualifiedName, localElement);
                }
                else { 
                    XmlSchemaElement element = (XmlSchemaElement)complexType.LocalElements[localElement.QualifiedName];
                    if (element.ElementSchemaType != localElement.ElementSchemaType) { 
                        SendValidationEvent(Res.Sch_ElementTypeCollision, particle); 
                    }
                } 
            }
            else if (particle is XmlSchemaGroupBase) {
                XmlSchemaObjectCollection particles = ((XmlSchemaGroupBase)particle).Items;
                foreach (XmlSchemaParticle p in particles) { 
                    CompileParticleElements(complexType, p);
                } 
            } 
        }
 
        private void CompileCompexTypeElements(XmlSchemaComplexType complexType) {
            if (complexType.IsProcessing) {
                SendValidationEvent(Res.Sch_TypeCircularRef, complexType);
                return; 
            }
            complexType.IsProcessing = true; 
            if (complexType.ContentTypeParticle != XmlSchemaParticle.Empty) { 
                CompileParticleElements(complexType, complexType.ContentTypeParticle);
            } 
            complexType.IsProcessing = false;
        }

        private XmlSchemaSimpleType GetSimpleType(XmlQualifiedName name) { 
            XmlSchemaSimpleType type = this.schema.SchemaTypes[name] as XmlSchemaSimpleType;
            if (type != null) { 
                CompileSimpleType(type); 
            }
            else { 
                type = DatatypeImplementation.GetSimpleTypeFromXsdType(name);
                //Re-assign datatype impl for V1Compat
                if (type != null) {
                    if (type.TypeCode == XmlTypeCode.NormalizedString) { 
                        type = DatatypeImplementation.GetNormalizedStringTypeV1Compat();
                    } 
                    else if (type.TypeCode == XmlTypeCode.Token) { 
                        type = DatatypeImplementation.GetTokenTypeV1Compat();
                    } 
                }
            }
            return type;
        } 

        private XmlSchemaComplexType GetComplexType(XmlQualifiedName name) { 
            XmlSchemaComplexType type = this.schema.SchemaTypes[name] as XmlSchemaComplexType; 
            if (type != null) {
                CompileComplexType(type); 
            }
            return type;
        }
 
         private XmlSchemaType GetAnySchemaType(XmlQualifiedName name) {
                XmlSchemaType type = (XmlSchemaType)this.schema.SchemaTypes[name]; 
                if (type != null) { 
                    if (type is XmlSchemaComplexType) {
                        CompileComplexType((XmlSchemaComplexType)type); 
                    }
                    else {
                        CompileSimpleType((XmlSchemaSimpleType)type);
                    } 
                    return type;
                } 
                else { //Its is a built-in simpleType 
                    XmlSchemaSimpleType simpleType = DatatypeImplementation.GetSimpleTypeFromXsdType(name);
                    return simpleType; 
                }
        }
    };
 
} // namespace System.Xml

// 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.Globalization;
    using System.Text;
    using System.Diagnostics; 

    internal sealed class SchemaCollectionCompiler : BaseProcessor { 
        bool compileContentModel; 
        XmlSchemaObjectTable examplars = new XmlSchemaObjectTable();
        Stack complexTypeStack = new Stack(); 
        XmlSchema schema;

        public SchemaCollectionCompiler(XmlNameTable nameTable, ValidationEventHandler eventHandler)
            : base(nameTable, null, eventHandler) { 
        }
 
        public bool Execute(XmlSchema schema, SchemaInfo schemaInfo, bool compileContentModel) { 
            this.compileContentModel = compileContentModel;
            this.schema = schema; 
            Prepare();
            Cleanup();
            Compile();
            if (!HasErrors) { 
                Output(schemaInfo);
            } 
            return !HasErrors; 
        }
 
        private void Prepare() {
            foreach (XmlSchemaElement element in this.schema.Elements.Values) {
                if (!element.SubstitutionGroup.IsEmpty) {
                    XmlSchemaSubstitutionGroup substitutionGroup = (XmlSchemaSubstitutionGroup)this.examplars[element.SubstitutionGroup]; 
                    if (substitutionGroup == null) {
                        substitutionGroup = new XmlSchemaSubstitutionGroupV1Compat(); 
                        substitutionGroup.Examplar = element.SubstitutionGroup; 
                        examplars.Add(element.SubstitutionGroup, substitutionGroup);
                    } 
                    ArrayList members = substitutionGroup.Members;
                    Debug.Assert(!members.Contains(element));
                    members.Add(element);
                } 
            }
        } 
 
        private void Cleanup() {
            foreach (XmlSchemaGroup group in this.schema.Groups.Values) { 
                CleanupGroup(group);
            }
            foreach (XmlSchemaAttributeGroup attributeGroup in this.schema.AttributeGroups.Values) {
                CleanupAttributeGroup(attributeGroup); 
            }
            foreach (XmlSchemaType type in this.schema.SchemaTypes.Values) { 
                if (type is XmlSchemaComplexType) { 
                    CleanupComplexType((XmlSchemaComplexType)type);
                } 
                else {
                    CleanupSimpleType((XmlSchemaSimpleType)type);
                }
            } 
            foreach (XmlSchemaElement element in this.schema.Elements.Values) {
                CleanupElement(element); 
            } 
            foreach (XmlSchemaAttribute attribute in this.schema.Attributes.Values) {
                CleanupAttribute(attribute); 
            }
        }

 
        internal static void Cleanup(XmlSchema schema) {
            foreach(XmlSchemaExternal include in schema.Includes) { 
                if (include.Schema != null) { 
                    Cleanup(include.Schema);
                } 
                if(include is XmlSchemaRedefine) {
                    XmlSchemaRedefine rdef = include as XmlSchemaRedefine;
                    rdef.AttributeGroups.Clear();
                    rdef.Groups.Clear(); 
                    rdef.SchemaTypes.Clear();
 
                 foreach(object item in rdef.Items) { 
                    if (item is XmlSchemaAttribute) {
                        CleanupAttribute((XmlSchemaAttribute)item); 
                    }
                    else if (item is XmlSchemaAttributeGroup) {
                        CleanupAttributeGroup((XmlSchemaAttributeGroup)item);
                    } 
                    else if (item is XmlSchemaComplexType) {
                        CleanupComplexType((XmlSchemaComplexType)item); 
                    } 
                    else if (item is XmlSchemaSimpleType) {
                        CleanupSimpleType((XmlSchemaSimpleType)item); 
                    }
                    else if (item is XmlSchemaElement) {
                        CleanupElement((XmlSchemaElement)item);
                    } 
                    else if (item is XmlSchemaGroup) {
                        CleanupGroup((XmlSchemaGroup)item); 
                    } 
                 }
                } 

            }

            foreach(object item in schema.Items) { 
                if (item is XmlSchemaAttribute) {
                    CleanupAttribute((XmlSchemaAttribute)item); 
                } 
                else if (item is XmlSchemaAttributeGroup) {
                    CleanupAttributeGroup((XmlSchemaAttributeGroup)item); 
                }
                else if (item is XmlSchemaComplexType) {
                    CleanupComplexType((XmlSchemaComplexType)item);
                } 
                else if (item is XmlSchemaSimpleType) {
                    CleanupSimpleType((XmlSchemaSimpleType)item); 
                } 
                else if (item is XmlSchemaElement) {
                    CleanupElement((XmlSchemaElement)item); 
                }
                else if (item is XmlSchemaGroup) {
                    CleanupGroup((XmlSchemaGroup)item);
                } 
            }
            schema.Attributes.Clear(); 
            schema.AttributeGroups.Clear(); 
            schema.SchemaTypes.Clear();
            schema.Elements.Clear(); 
            schema.Groups.Clear();
            schema.Notations.Clear();
            schema.Ids.Clear();
            schema.IdentityConstraints.Clear(); 
        }
 
        private void Compile() { 
            this.schema.SchemaTypes.Insert(DatatypeImplementation.QnAnyType, XmlSchemaComplexType.AnyType);
 
            foreach (XmlSchemaSubstitutionGroupV1Compat substitutionGroup in examplars.Values) {
                CompileSubstitutionGroup(substitutionGroup);
            }
            foreach (XmlSchemaGroup group in this.schema.Groups.Values) { 
                CompileGroup(group);
            } 
            foreach (XmlSchemaAttributeGroup attributeGroup in this.schema.AttributeGroups.Values) { 
                CompileAttributeGroup(attributeGroup);
            } 
            foreach (XmlSchemaType type in this.schema.SchemaTypes.Values) {
                if (type is XmlSchemaComplexType) {
                    CompileComplexType((XmlSchemaComplexType)type);
                } 
                else {
                    CompileSimpleType((XmlSchemaSimpleType)type); 
                } 
            }
            foreach (XmlSchemaElement element in this.schema.Elements.Values) { 
                if (element.ElementDecl == null) {
                    CompileElement(element);
                }
            } 
            foreach (XmlSchemaAttribute attribute in this.schema.Attributes.Values) {
                if (attribute.AttDef == null) { 
                    CompileAttribute(attribute); 
                }
            } 
            foreach (XmlSchemaIdentityConstraint identityConstraint in this.schema.IdentityConstraints.Values) {
                if (identityConstraint.CompiledConstraint == null) {
                    CompileIdentityConstraint(identityConstraint);
                } 
            }
            while (this.complexTypeStack.Count > 0) { 
                XmlSchemaComplexType type = (XmlSchemaComplexType)complexTypeStack.Pop(); 
                CompileCompexTypeElements(type);
            } 
            foreach (XmlSchemaType type in this.schema.SchemaTypes.Values) {
                if (type is XmlSchemaComplexType) {
                    CheckParticleDerivation((XmlSchemaComplexType)type);
                } 
            }
            foreach (XmlSchemaElement element in this.schema.Elements.Values) { 
                if (element.ElementSchemaType is XmlSchemaComplexType && element.SchemaTypeName == XmlQualifiedName.Empty) { // only local schemaTypes 
                    CheckParticleDerivation((XmlSchemaComplexType)element.ElementSchemaType);
                } 
            }
            foreach (XmlSchemaSubstitutionGroup substitutionGroup in examplars.Values) {
                CheckSubstitutionGroup(substitutionGroup);
            } 

            this.schema.SchemaTypes.Remove(DatatypeImplementation.QnAnyType); //For backward compatibility 
        } 

        private void Output(SchemaInfo schemaInfo) { 
            foreach (XmlSchemaElement element in this.schema.Elements.Values) {
                schemaInfo.TargetNamespaces[element.QualifiedName.Namespace] = true;
                schemaInfo.ElementDecls.Add(element.QualifiedName, element.ElementDecl);
            } 
            foreach (XmlSchemaAttribute attribute in this.schema.Attributes.Values) {
                schemaInfo.TargetNamespaces[attribute.QualifiedName.Namespace] = true; 
                schemaInfo.AttributeDecls.Add(attribute.QualifiedName, attribute.AttDef); 
            }
            foreach (XmlSchemaType type in this.schema.SchemaTypes.Values) { 
                schemaInfo.TargetNamespaces[type.QualifiedName.Namespace] = true;
                 XmlSchemaComplexType complexType = type as XmlSchemaComplexType;
                 if (complexType == null || (!complexType.IsAbstract && type != XmlSchemaComplexType.AnyType)) {
                    schemaInfo.ElementDeclsByType.Add(type.QualifiedName, type.ElementDecl); 
                 }
            } 
            foreach (XmlSchemaNotation notation in this.schema.Notations.Values) { 
                schemaInfo.TargetNamespaces[notation.QualifiedName.Namespace] = true;
                SchemaNotation no = new SchemaNotation(notation.QualifiedName); 
                no.SystemLiteral = notation.System;
                no.Pubid = notation.Public;
                if (schemaInfo.Notations[no.Name.Name] == null) {
                    schemaInfo.Notations.Add(no.Name.Name, no); 
                }
            } 
        } 

        private static void CleanupAttribute(XmlSchemaAttribute attribute) { 
            if (attribute.SchemaType != null) {
                CleanupSimpleType((XmlSchemaSimpleType)attribute.SchemaType);
            }
            attribute.AttDef = null; 
        }
 
        private static void CleanupAttributeGroup(XmlSchemaAttributeGroup attributeGroup) { 
            CleanupAttributes(attributeGroup.Attributes);
            attributeGroup.AttributeUses.Clear(); 
            attributeGroup.AttributeWildcard = null;
        }

        private static void CleanupComplexType(XmlSchemaComplexType complexType) { 
            if (complexType.ContentModel != null) { //simpleContent or complexContent
                if (complexType.ContentModel is XmlSchemaSimpleContent) { 
                    XmlSchemaSimpleContent simpleContent = (XmlSchemaSimpleContent)complexType.ContentModel; 
                    if (simpleContent.Content is XmlSchemaSimpleContentExtension) {
                        XmlSchemaSimpleContentExtension simpleExtension = (XmlSchemaSimpleContentExtension)simpleContent.Content; 
                        CleanupAttributes(simpleExtension.Attributes);
                    }
                    else { //simpleContent.Content is XmlSchemaSimpleContentRestriction
                        XmlSchemaSimpleContentRestriction simpleRestriction = (XmlSchemaSimpleContentRestriction)simpleContent.Content; 
                        CleanupAttributes(simpleRestriction.Attributes);
                    } 
                } 
                else { // complexType.ContentModel is XmlSchemaComplexContent
                    XmlSchemaComplexContent complexContent = (XmlSchemaComplexContent)complexType.ContentModel; 
                    if (complexContent.Content is XmlSchemaComplexContentExtension) {
                        XmlSchemaComplexContentExtension complexExtension = (XmlSchemaComplexContentExtension)complexContent.Content;
                        CleanupParticle(complexExtension.Particle);
                        CleanupAttributes(complexExtension.Attributes); 

                    } 
                    else { //XmlSchemaComplexContentRestriction 
                        XmlSchemaComplexContentRestriction complexRestriction = (XmlSchemaComplexContentRestriction)complexContent.Content;
                        CleanupParticle(complexRestriction.Particle); 
                        CleanupAttributes(complexRestriction.Attributes);
                    }
                }
            } 
            else { //equals XmlSchemaComplexContent with baseType is anyType
                CleanupParticle(complexType.Particle); 
                CleanupAttributes(complexType.Attributes); 
            }
            complexType.LocalElements.Clear(); 
            complexType.AttributeUses.Clear();
            complexType.SetAttributeWildcard(null);
            complexType.SetContentTypeParticle(XmlSchemaParticle.Empty);
            complexType.ElementDecl = null; 
        }
 
        private static void CleanupSimpleType(XmlSchemaSimpleType simpleType) { 
            simpleType.ElementDecl = null;
        } 

        private static void CleanupElement(XmlSchemaElement element) {
            if (element.SchemaType != null) {
                XmlSchemaComplexType complexType = element.SchemaType as XmlSchemaComplexType; 
                if (complexType != null) {
                    CleanupComplexType(complexType); 
                } 
                else {
                    CleanupSimpleType((XmlSchemaSimpleType)element.SchemaType); 
                }
            }
            foreach (XmlSchemaIdentityConstraint constr in element.Constraints) {
                constr.CompiledConstraint = null; 
            }
            element.ElementDecl = null; 
        } 

        private static void CleanupAttributes(XmlSchemaObjectCollection attributes) { 
            foreach (XmlSchemaObject obj in attributes) {
                if (obj is XmlSchemaAttribute) {
                    CleanupAttribute((XmlSchemaAttribute)obj);
                } 
            }
        } 
 
        private static void CleanupGroup(XmlSchemaGroup group) {
            CleanupParticle(group.Particle); 
            group.CanonicalParticle = null;
        }

        private static void CleanupParticle(XmlSchemaParticle particle) { 
            if (particle is XmlSchemaElement) {
                CleanupElement((XmlSchemaElement)particle); 
            } 
            else if (particle is XmlSchemaGroupBase) {
                foreach(XmlSchemaParticle p in ((XmlSchemaGroupBase)particle).Items) { 
                    CleanupParticle(p);
                }
            }
        } 

        private void CompileSubstitutionGroup(XmlSchemaSubstitutionGroupV1Compat substitutionGroup) { 
            if (substitutionGroup.IsProcessing) { 
                foreach (XmlSchemaElement element in substitutionGroup.Members) {
                    SendValidationEvent(Res.Sch_SubstitutionCircularRef, element); 
                    return;
                }
            }
            XmlSchemaElement examplar = (XmlSchemaElement)this.schema.Elements[substitutionGroup.Examplar]; 
            if (substitutionGroup.Members.Contains(examplar)) {// already checked
                return; 
            } 
            substitutionGroup.IsProcessing = true;
            if (examplar != null) { 
                if (examplar.FinalResolved == XmlSchemaDerivationMethod.All) {
                    SendValidationEvent(Res.Sch_InvalidExamplar, examplar);
                }
 
                foreach (XmlSchemaElement element in substitutionGroup.Members) {
 
                    //Chain to other head's that are members of this head's substGroup 
                    XmlSchemaSubstitutionGroupV1Compat g = (XmlSchemaSubstitutionGroupV1Compat)examplars[element.QualifiedName];
                    if (g != null) { 
                        CompileSubstitutionGroup(g);
                        foreach (XmlSchemaElement element1 in g.Choice.Items) {
                            substitutionGroup.Choice.Items.Add(element1);
                        } 
                    }
                    else { 
                        substitutionGroup.Choice.Items.Add(element); 
                    }
                } 
                substitutionGroup.Choice.Items.Add(examplar);
                substitutionGroup.Members.Add(examplar); // Compiled mark
            }
            else { 
                foreach (XmlSchemaElement element in substitutionGroup.Members) {
                    SendValidationEvent(Res.Sch_NoExamplar, element); 
                    break; 
                }
            } 
           substitutionGroup.IsProcessing = false;
        }

        private void CheckSubstitutionGroup(XmlSchemaSubstitutionGroup substitutionGroup) { 
            XmlSchemaElement examplar = (XmlSchemaElement)this.schema.Elements[substitutionGroup.Examplar];
            if (examplar != null) { 
                foreach (XmlSchemaElement element in substitutionGroup.Members) { 
                    if (element != examplar) {
                        if (!XmlSchemaType.IsDerivedFrom(element.ElementSchemaType, examplar.ElementSchemaType, examplar.FinalResolved)) { 
                            SendValidationEvent(Res.Sch_InvalidSubstitutionMember, (element.QualifiedName).ToString(), (examplar.QualifiedName).ToString(), element);
                        }
                    }
                } 
            }
        } 
 
        private void CompileGroup(XmlSchemaGroup group) {
            if (group.IsProcessing) { 
                SendValidationEvent(Res.Sch_GroupCircularRef, group);
                group.CanonicalParticle = XmlSchemaParticle.Empty;
            }
            else { 
                group.IsProcessing = true;
                if (group.CanonicalParticle == null) { 
                    group.CanonicalParticle = CannonicalizeParticle(group.Particle, true, true); 
                }
                Debug.Assert(group.CanonicalParticle != null); 
                group.IsProcessing = false;
            }
        }
 
        private void CompileSimpleType(XmlSchemaSimpleType simpleType) {
            if (simpleType.IsProcessing) { 
                throw new XmlSchemaException(Res.Sch_TypeCircularRef, simpleType); 
            }
            if (simpleType.ElementDecl != null) { // already compiled 
                return;
            }
            simpleType.IsProcessing = true;
            try { 
                if (simpleType.Content is XmlSchemaSimpleTypeList) {
                    XmlSchemaSimpleTypeList list = (XmlSchemaSimpleTypeList)simpleType.Content; 
                    XmlSchemaDatatype datatype; 
                    simpleType.SetBaseSchemaType(DatatypeImplementation.AnySimpleType);
                    if (list.ItemTypeName.IsEmpty) { 
                        CompileSimpleType(list.ItemType);
                        list.BaseItemType = list.ItemType;
                        datatype = list.ItemType.Datatype;
                    } 
                    else {
                        XmlSchemaSimpleType type = GetSimpleType(list.ItemTypeName); 
                        if (type != null) { 
                            if ((type.FinalResolved & XmlSchemaDerivationMethod.List) != 0) {
                                SendValidationEvent(Res.Sch_BaseFinalList, simpleType); 
                            }
                            list.BaseItemType = type;
                            datatype = type.Datatype;
                        } 
                        else {
                            throw new XmlSchemaException(Res.Sch_UndeclaredSimpleType, list.ItemTypeName.ToString(), simpleType); 
                        } 
                    }
                    simpleType.SetDatatype(datatype.DeriveByList(simpleType)); 
                    simpleType.SetDerivedBy(XmlSchemaDerivationMethod.List);
                }
                else if (simpleType.Content is XmlSchemaSimpleTypeRestriction) {
                    XmlSchemaSimpleTypeRestriction restriction = (XmlSchemaSimpleTypeRestriction)simpleType.Content; 
                    XmlSchemaDatatype datatype;
                    if (restriction.BaseTypeName.IsEmpty) { 
                        CompileSimpleType(restriction.BaseType); 
                        simpleType.SetBaseSchemaType(restriction.BaseType);
                        datatype = restriction.BaseType.Datatype; 
                    }
                    else if (simpleType.Redefined != null && restriction.BaseTypeName == simpleType.Redefined.QualifiedName) {
                        CompileSimpleType((XmlSchemaSimpleType)simpleType.Redefined);
                        simpleType.SetBaseSchemaType(simpleType.Redefined.BaseXmlSchemaType); 
                        datatype = simpleType.Redefined.Datatype;
                    } 
                    else { 
                        if (restriction.BaseTypeName.Equals(DatatypeImplementation.QnAnySimpleType)) {
                            throw new XmlSchemaException(Res.Sch_InvalidSimpleTypeRestriction, restriction.BaseTypeName.ToString(), simpleType); 
                        }
                        XmlSchemaSimpleType type = GetSimpleType(restriction.BaseTypeName);
                        if (type != null) {
                            if ((type.FinalResolved & XmlSchemaDerivationMethod.Restriction) != 0) { 
                                SendValidationEvent(Res.Sch_BaseFinalRestriction, simpleType);
                            } 
                            simpleType.SetBaseSchemaType(type); 
                            datatype = type.Datatype;
                        } 
                        else {
                            throw new XmlSchemaException(Res.Sch_UndeclaredSimpleType, restriction.BaseTypeName.ToString(), simpleType);
                        }
                    } 
                    simpleType.SetDatatype(datatype.DeriveByRestriction(restriction.Facets, NameTable, simpleType));
                    simpleType.SetDerivedBy(XmlSchemaDerivationMethod.Restriction); 
                } 
                else { //simpleType.Content is XmlSchemaSimpleTypeUnion
                    XmlSchemaSimpleType[] baseTypes = CompileBaseMemberTypes(simpleType); 
                    simpleType.SetBaseSchemaType(DatatypeImplementation.AnySimpleType);
                    simpleType.SetDatatype(XmlSchemaDatatype.DeriveByUnion(baseTypes, simpleType));
                    simpleType.SetDerivedBy(XmlSchemaDerivationMethod.Union);
                } 
            }
            catch (XmlSchemaException e) { 
                if (e.SourceSchemaObject == null) { 
                    e.SetSource(simpleType);
                } 
                SendValidationEvent(e);
                simpleType.SetDatatype(DatatypeImplementation.AnySimpleType.Datatype);
            }
            finally { 
                SchemaElementDecl decl = new SchemaElementDecl();
                decl.ContentValidator = ContentValidator.TextOnly; 
                decl.SchemaType = simpleType; 
                decl.Datatype = simpleType.Datatype;
                simpleType.ElementDecl = decl; 
                simpleType.IsProcessing = false;
            }
        }
 
        private XmlSchemaSimpleType[] CompileBaseMemberTypes(XmlSchemaSimpleType simpleType) {
            XmlSchemaSimpleType unionMember; 
            ArrayList memberTypeDefinitions = new ArrayList(); 

            XmlSchemaSimpleTypeUnion mainUnion = (XmlSchemaSimpleTypeUnion)simpleType.Content; 

            Array mainMemberTypes = mainUnion.MemberTypes;
            if (mainMemberTypes != null) {
                foreach(XmlQualifiedName memberName in mainMemberTypes) { 
                    unionMember = GetSimpleType(memberName);
                    if (unionMember != null) { 
                        if (unionMember.Datatype.Variety == XmlSchemaDatatypeVariety.Union) { //union of union 
                            CheckUnionType(unionMember, memberTypeDefinitions, simpleType);
                        } 
                        else { //its list or atomic
                            memberTypeDefinitions.Add(unionMember);
                        }
                        //Check derivation method of the member that is referenced 
                        if ((unionMember.FinalResolved & XmlSchemaDerivationMethod.Union) != 0) {
                            SendValidationEvent(Res.Sch_BaseFinalUnion, simpleType); 
                        } 
                    }
                    else { 
                        throw new XmlSchemaException(Res.Sch_UndeclaredSimpleType, memberName.ToString(), simpleType);
                    }
                }
            } 

            //Now add the baseTypes that are defined inside the union itself 
            XmlSchemaObjectCollection mainBaseTypes = mainUnion.BaseTypes; // 
            if (mainBaseTypes != null) {
                foreach(XmlSchemaSimpleType st in mainBaseTypes) { 
                    CompileSimpleType(st);
                    if (st.Datatype.Variety == XmlSchemaDatatypeVariety.Union) { //union of union
                        CheckUnionType(st, memberTypeDefinitions, simpleType);
                    } 
                    else {  //its list or atomic
                        memberTypeDefinitions.Add(st); 
                    } 
                }
            } 
            //set all types
            mainUnion.SetBaseMemberTypes(memberTypeDefinitions.ToArray(typeof(XmlSchemaSimpleType)) as XmlSchemaSimpleType[]);
            return mainUnion.BaseMemberTypes;
        } 

        private void CheckUnionType(XmlSchemaSimpleType unionMember, ArrayList memberTypeDefinitions, XmlSchemaSimpleType parentType) { 
            XmlSchemaDatatype unionDatatype = unionMember.Datatype; 
            if (unionMember.DerivedBy == XmlSchemaDerivationMethod.Restriction && (unionDatatype.HasLexicalFacets || unionDatatype.HasValueFacets) ) {
                SendValidationEvent(Res.Sch_UnionFromUnion, parentType); 
            }
            else {
                Datatype_union uniondt = unionMember.Datatype as Datatype_union;
                memberTypeDefinitions.AddRange(uniondt.BaseMemberTypes); 
            }
        } 
 
        private void CompileComplexType(XmlSchemaComplexType complexType) {
            if (complexType.ElementDecl != null) { //already compiled 
                return;
            }
            if (complexType.IsProcessing) {
                SendValidationEvent(Res.Sch_TypeCircularRef, complexType); 
                return;
            } 
            complexType.IsProcessing = true; 
            if (complexType.ContentModel != null) { //simpleContent or complexContent
                if (complexType.ContentModel is XmlSchemaSimpleContent) { 
                    XmlSchemaSimpleContent simpleContent = (XmlSchemaSimpleContent)complexType.ContentModel;
                    complexType.SetContentType(XmlSchemaContentType.TextOnly);
                    if (simpleContent.Content is XmlSchemaSimpleContentExtension) {
                        CompileSimpleContentExtension(complexType, (XmlSchemaSimpleContentExtension)simpleContent.Content); 
                    }
                    else { //simpleContent.Content is XmlSchemaSimpleContentRestriction 
                        CompileSimpleContentRestriction(complexType, (XmlSchemaSimpleContentRestriction)simpleContent.Content); 
                    }
                } 
                else { // complexType.ContentModel is XmlSchemaComplexContent
                    XmlSchemaComplexContent complexContent = (XmlSchemaComplexContent)complexType.ContentModel;
                    if (complexContent.Content is XmlSchemaComplexContentExtension) {
                        CompileComplexContentExtension(complexType, complexContent, (XmlSchemaComplexContentExtension)complexContent.Content); 
                    }
                    else { // complexContent.Content is XmlSchemaComplexContentRestriction 
                        CompileComplexContentRestriction(complexType, complexContent, (XmlSchemaComplexContentRestriction)complexContent.Content); 
                    }
                } 
            }
            else { //equals XmlSchemaComplexContent with baseType is anyType
                    complexType.SetBaseSchemaType(XmlSchemaComplexType.AnyType);
                    CompileLocalAttributes(XmlSchemaComplexType.AnyType, complexType, complexType.Attributes, complexType.AnyAttribute, XmlSchemaDerivationMethod.Restriction); 
                    complexType.SetDerivedBy(XmlSchemaDerivationMethod.Restriction);
                    complexType.SetContentTypeParticle(CompileContentTypeParticle(complexType.Particle, true)); 
                    complexType.SetContentType(GetSchemaContentType(complexType, null, complexType.ContentTypeParticle)); 
            }
            bool hasID = false; 
            foreach(XmlSchemaAttribute attribute in complexType.AttributeUses.Values) {
                if (attribute.Use != XmlSchemaUse.Prohibited) {
                    XmlSchemaDatatype datatype = attribute.Datatype;
                    if (datatype != null && datatype.TokenizedType == XmlTokenizedType.ID) { 
                        if (hasID) {
                            SendValidationEvent(Res.Sch_TwoIdAttrUses, complexType); 
                        } 
                        else {
                            hasID = true; 
                        }
                    }
                }
            } 
            SchemaElementDecl decl = new SchemaElementDecl();
            decl.ContentValidator = CompileComplexContent(complexType); 
            decl.SchemaType = complexType; 
            decl.IsAbstract = complexType.IsAbstract;
            decl.Datatype = complexType.Datatype; 
            decl.Block = complexType.BlockResolved;
            decl.AnyAttribute = complexType.AttributeWildcard;
            foreach(XmlSchemaAttribute attribute in complexType.AttributeUses.Values) {
                if (attribute.Use == XmlSchemaUse.Prohibited) { 
                    if (decl.ProhibitedAttributes[attribute.QualifiedName] == null) {
                        decl.ProhibitedAttributes.Add(attribute.QualifiedName, attribute.QualifiedName); 
                    } 
                }
                else { 
                    if (decl.AttDefs[attribute.QualifiedName] == null && attribute.AttDef != null && attribute.AttDef.Name != XmlQualifiedName.Empty && attribute.AttDef != SchemaAttDef.Empty) {
                        decl.AddAttDef(attribute.AttDef);
                    }
                } 
            }
            decl.EndAddAttDef(); 
 
            complexType.ElementDecl = decl;
 
            complexType.IsProcessing = false;
        }

 
        private void CompileSimpleContentExtension(XmlSchemaComplexType complexType, XmlSchemaSimpleContentExtension simpleExtension) {
            XmlSchemaComplexType baseType = null; 
            if (complexType.Redefined != null && simpleExtension.BaseTypeName == complexType.Redefined.QualifiedName) { 
                baseType = (XmlSchemaComplexType)complexType.Redefined;
                CompileComplexType(baseType); 
                complexType.SetBaseSchemaType(baseType);
                complexType.SetDatatype(baseType.Datatype);
            }
            else { 
                XmlSchemaType bto = GetAnySchemaType(simpleExtension.BaseTypeName);
                if (bto == null) { 
                    SendValidationEvent(Res.Sch_UndeclaredType, simpleExtension.BaseTypeName.ToString(), complexType); 
                }
                else { 
                    complexType.SetBaseSchemaType(bto);
                    complexType.SetDatatype(bto.Datatype);
                }
                baseType = bto as XmlSchemaComplexType; 
            }
            if (baseType != null) { 
                if ((baseType.FinalResolved & XmlSchemaDerivationMethod.Extension) != 0) { 
                    SendValidationEvent(Res.Sch_BaseFinalExtension, complexType);
                } 
                if (baseType.ContentType != XmlSchemaContentType.TextOnly) {
                    SendValidationEvent(Res.Sch_NotSimpleContent, complexType);
                }
            } 
            complexType.SetDerivedBy(XmlSchemaDerivationMethod.Extension);
            CompileLocalAttributes(baseType, complexType, simpleExtension.Attributes, simpleExtension.AnyAttribute, XmlSchemaDerivationMethod.Extension); 
        } 

        private void CompileSimpleContentRestriction(XmlSchemaComplexType complexType, XmlSchemaSimpleContentRestriction simpleRestriction) { 
            XmlSchemaComplexType baseType = null;
            XmlSchemaDatatype datatype = null;
            if (complexType.Redefined != null && simpleRestriction.BaseTypeName == complexType.Redefined.QualifiedName) {
                baseType = (XmlSchemaComplexType)complexType.Redefined; 
                CompileComplexType(baseType);
                datatype = baseType.Datatype; 
            } 
            else {
                baseType = GetComplexType(simpleRestriction.BaseTypeName); 
                if (baseType == null) {
                    SendValidationEvent(Res.Sch_UndefBaseRestriction, simpleRestriction.BaseTypeName.ToString(), simpleRestriction);
                    return;
                } 
                if (baseType.ContentType == XmlSchemaContentType.TextOnly) {
                    if (simpleRestriction.BaseType == null) { 
                        datatype = baseType.Datatype; 
                        //There is a bug here. Need to check if simpleRestriction has facets.
                        //If yes, Need tp apply these facets as well. 
                    }
                    else {
                        CompileSimpleType(simpleRestriction.BaseType);
                        if(!XmlSchemaType.IsDerivedFromDatatype(simpleRestriction.BaseType.Datatype, baseType.Datatype, XmlSchemaDerivationMethod.None)) { 
                           SendValidationEvent(Res.Sch_DerivedNotFromBase, simpleRestriction);
                        } 
                        datatype = simpleRestriction.BaseType.Datatype; 
                    }
                } 
                else if (baseType.ContentType == XmlSchemaContentType.Mixed && baseType.ElementDecl.ContentValidator.IsEmptiable) {
                    if (simpleRestriction.BaseType != null) {
                        CompileSimpleType(simpleRestriction.BaseType);
                        complexType.SetBaseSchemaType(simpleRestriction.BaseType); 
                        datatype = simpleRestriction.BaseType.Datatype;
                    } 
                    else { 
                        SendValidationEvent(Res.Sch_NeedSimpleTypeChild, simpleRestriction);
                    } 
                }
                else {
                    SendValidationEvent(Res.Sch_NotSimpleContent, complexType);
                } 
            }
            if (baseType != null && baseType.ElementDecl != null) { 
                if ((baseType.FinalResolved & XmlSchemaDerivationMethod.Restriction) != 0) { 
                    SendValidationEvent(Res.Sch_BaseFinalRestriction, complexType);
                } 
            }
            if (baseType != null) {
                complexType.SetBaseSchemaType(baseType);
            } 
            if (datatype != null) {
                try { 
                    complexType.SetDatatype(datatype.DeriveByRestriction(simpleRestriction.Facets, NameTable, complexType)); 
                }
                catch (XmlSchemaException e) { 
                    if (e.SourceSchemaObject == null) {
                        e.SetSource(complexType);
                    }
                    SendValidationEvent(e); 
                    complexType.SetDatatype(DatatypeImplementation.AnySimpleType.Datatype);
                } 
            } 
            complexType.SetDerivedBy(XmlSchemaDerivationMethod.Restriction);
            CompileLocalAttributes(baseType, complexType, simpleRestriction.Attributes, simpleRestriction.AnyAttribute, XmlSchemaDerivationMethod.Restriction); 
        }

        private void CompileComplexContentExtension(XmlSchemaComplexType complexType, XmlSchemaComplexContent complexContent, XmlSchemaComplexContentExtension complexExtension) {
            XmlSchemaComplexType baseType = null; 
            if (complexType.Redefined != null && complexExtension.BaseTypeName == complexType.Redefined.QualifiedName) {
                baseType = (XmlSchemaComplexType)complexType.Redefined; 
                CompileComplexType(baseType); 
            }
            else { 
                baseType = GetComplexType(complexExtension.BaseTypeName);
                if (baseType == null) {
                    SendValidationEvent(Res.Sch_UndefBaseExtension, complexExtension.BaseTypeName.ToString(), complexExtension);
                    return; 
                }
            } 
            if (baseType != null && baseType.ElementDecl != null) { 
                if (baseType.ContentType == XmlSchemaContentType.TextOnly) {
                    SendValidationEvent(Res.Sch_NotComplexContent, complexType); 
                    return;
                }
            }
            complexType.SetBaseSchemaType(baseType); 
            if ((baseType.FinalResolved & XmlSchemaDerivationMethod.Extension) != 0) {
                SendValidationEvent(Res.Sch_BaseFinalExtension, complexType); 
            } 
            CompileLocalAttributes(baseType, complexType, complexExtension.Attributes, complexExtension.AnyAttribute, XmlSchemaDerivationMethod.Extension);
 
            XmlSchemaParticle baseParticle = baseType.ContentTypeParticle;
            XmlSchemaParticle extendedParticle = CannonicalizeParticle(complexExtension.Particle, true, true);
            if (baseParticle != XmlSchemaParticle.Empty) {
                if (extendedParticle != XmlSchemaParticle.Empty) { 
                    XmlSchemaSequence compiledParticle = new XmlSchemaSequence();
                    compiledParticle.Items.Add(baseParticle); 
                    compiledParticle.Items.Add(extendedParticle); 
                    complexType.SetContentTypeParticle(CompileContentTypeParticle(compiledParticle, false));
                } 
                else {
                    complexType.SetContentTypeParticle(baseParticle);
                }
                XmlSchemaContentType contentType = GetSchemaContentType(complexType, complexContent, extendedParticle); 
                if (contentType == XmlSchemaContentType.Empty) { //Derived content type is empty, Get ContentType from base
                    contentType = baseType.ContentType; 
                } 
                complexType.SetContentType(contentType);
                if (complexType.ContentType != baseType.ContentType) { 
                    SendValidationEvent(Res.Sch_DifContentType, complexType);
                }
            }
            else { 
                complexType.SetContentTypeParticle(extendedParticle);
                complexType.SetContentType(GetSchemaContentType(complexType, complexContent, complexType.ContentTypeParticle)); 
            } 
            complexType.SetDerivedBy(XmlSchemaDerivationMethod.Extension);
        } 

        private void CompileComplexContentRestriction(XmlSchemaComplexType complexType, XmlSchemaComplexContent complexContent, XmlSchemaComplexContentRestriction complexRestriction) {
            XmlSchemaComplexType baseType = null;
            if (complexType.Redefined != null && complexRestriction.BaseTypeName == complexType.Redefined.QualifiedName) { 
                baseType = (XmlSchemaComplexType)complexType.Redefined;
                CompileComplexType(baseType); 
            } 
            else {
                baseType = GetComplexType(complexRestriction.BaseTypeName); 
                if (baseType == null) {
                    SendValidationEvent(Res.Sch_UndefBaseRestriction, complexRestriction.BaseTypeName.ToString(), complexRestriction);
                    return;
                } 
            }
            if (baseType != null && baseType.ElementDecl != null) { 
                if (baseType.ContentType == XmlSchemaContentType.TextOnly) { 
                    SendValidationEvent(Res.Sch_NotComplexContent, complexType);
                    return; 
                }
            }
            complexType.SetBaseSchemaType(baseType);
            if ((baseType.FinalResolved & XmlSchemaDerivationMethod.Restriction) != 0) { 
                SendValidationEvent(Res.Sch_BaseFinalRestriction, complexType);
            } 
            CompileLocalAttributes(baseType, complexType, complexRestriction.Attributes, complexRestriction.AnyAttribute, XmlSchemaDerivationMethod.Restriction); 

            complexType.SetContentTypeParticle(CompileContentTypeParticle(complexRestriction.Particle, true)); 
            complexType.SetContentType(GetSchemaContentType(complexType, complexContent, complexType.ContentTypeParticle));
            if (complexType.ContentType == XmlSchemaContentType.Empty) {
                if (baseType.ElementDecl != null) {
                    Debug.Assert(baseType.ElementDecl.ContentValidator != null); 
                }
                if (baseType.ElementDecl != null && !baseType.ElementDecl.ContentValidator.IsEmptiable) { 
                    SendValidationEvent(Res.Sch_InvalidContentRestriction, complexType); 
                }
            } 
            complexType.SetDerivedBy(XmlSchemaDerivationMethod.Restriction);
        }

        private void CheckParticleDerivation(XmlSchemaComplexType complexType) { 
            XmlSchemaComplexType baseType = complexType.BaseXmlSchemaType as XmlSchemaComplexType;
            if (baseType != null && baseType != XmlSchemaComplexType.AnyType && complexType.DerivedBy == XmlSchemaDerivationMethod.Restriction) { 
                if (!IsValidRestriction(complexType.ContentTypeParticle, baseType.ContentTypeParticle)) { 
#if DEBUG
                    if(complexType.ContentTypeParticle != null && baseType.ContentTypeParticle != null) { 
                        string position = string.Empty;
                        if (complexType.SourceUri != null) {
                            position = " in " + complexType.SourceUri + "(" + complexType.LineNumber + ", " + complexType.LinePosition + ")";
                        } 
                        Debug.WriteLineIf(DiagnosticsSwitches.XmlSchema.TraceError, "Invalid complexType content restriction" + position);
                        Debug.WriteLineIf(DiagnosticsSwitches.XmlSchema.TraceError, "     Base    " + DumpContentModel(baseType.ContentTypeParticle)); 
                        Debug.WriteLineIf(DiagnosticsSwitches.XmlSchema.TraceError, "     Derived " + DumpContentModel(complexType.ContentTypeParticle)); 
                    }
#endif 
                    SendValidationEvent(Res.Sch_InvalidParticleRestriction, complexType);
                }
            }
        } 

        private XmlSchemaParticle CompileContentTypeParticle(XmlSchemaParticle particle, bool substitution) { 
            XmlSchemaParticle ctp = CannonicalizeParticle(particle, true, substitution); 
            XmlSchemaChoice choice = ctp as XmlSchemaChoice;
            if (choice != null && choice.Items.Count == 0) { 
                if (choice.MinOccurs != decimal.Zero) {
                    SendValidationEvent(Res.Sch_EmptyChoice, choice, XmlSeverityType.Warning);
                }
                return XmlSchemaParticle.Empty; 
            }
            return ctp; 
        } 

        private XmlSchemaParticle CannonicalizeParticle(XmlSchemaParticle particle, bool root, bool substitution) { 
            if (particle == null || particle.IsEmpty) {
                return XmlSchemaParticle.Empty;
            }
            else if (particle is XmlSchemaElement) { 
                return CannonicalizeElement((XmlSchemaElement)particle, substitution);
            } 
            else if (particle is XmlSchemaGroupRef) { 
                return CannonicalizeGroupRef((XmlSchemaGroupRef)particle, root, substitution);
            } 
            else if (particle is XmlSchemaAll) {
                return CannonicalizeAll((XmlSchemaAll)particle, root, substitution);
            }
            else if (particle is XmlSchemaChoice) { 
                return CannonicalizeChoice((XmlSchemaChoice)particle, root, substitution);
            } 
            else if (particle is XmlSchemaSequence) { 
                return CannonicalizeSequence((XmlSchemaSequence)particle, root, substitution);
            } 
            else {
                return particle;
            }
        } 

        private XmlSchemaParticle CannonicalizeElement(XmlSchemaElement element, bool substitution) { 
            if (!element.RefName.IsEmpty && substitution && (element.BlockResolved & XmlSchemaDerivationMethod.Substitution) == 0) { 
                XmlSchemaSubstitutionGroupV1Compat substitutionGroup = (XmlSchemaSubstitutionGroupV1Compat)examplars[element.QualifiedName];
                if (substitutionGroup == null) { 
                    return element;
                }
                else {
                    XmlSchemaChoice choice = (XmlSchemaChoice)substitutionGroup.Choice.Clone(); 
                    choice.MinOccurs = element.MinOccurs;
                    choice.MaxOccurs = element.MaxOccurs; 
                    return choice; 
                }
            } 
            else {
                return element;
            }
        } 

        private XmlSchemaParticle CannonicalizeGroupRef(XmlSchemaGroupRef groupRef, bool root,  bool substitution) { 
            XmlSchemaGroup group; 
            if (groupRef.Redefined != null) {
                group = groupRef.Redefined; 
            }
            else {
                group = (XmlSchemaGroup)this.schema.Groups[groupRef.RefName];
            } 
            if (group == null) {
                SendValidationEvent(Res.Sch_UndefGroupRef, groupRef.RefName.ToString(), groupRef); 
                return XmlSchemaParticle.Empty; 
            }
            if (group.CanonicalParticle == null) { 
                CompileGroup(group);
            }
            if (group.CanonicalParticle == XmlSchemaParticle.Empty) {
                return XmlSchemaParticle.Empty; 
            }
            XmlSchemaGroupBase groupBase = (XmlSchemaGroupBase)group.CanonicalParticle; 
            if (groupBase is XmlSchemaAll) { 
                if (!root) {
                    SendValidationEvent(Res.Sch_AllRefNotRoot, "", groupRef); 
                    return XmlSchemaParticle.Empty;
                }
                if (groupRef.MinOccurs != decimal.One || groupRef.MaxOccurs != decimal.One) {
                    SendValidationEvent(Res.Sch_AllRefMinMax, groupRef); 
                    return XmlSchemaParticle.Empty;
                } 
            } 
            else if (groupBase is XmlSchemaChoice && groupBase.Items.Count == 0) {
                if (groupRef.MinOccurs != decimal.Zero) { 
                    SendValidationEvent(Res.Sch_EmptyChoice, groupRef, XmlSeverityType.Warning);
                }
                return XmlSchemaParticle.Empty;
            } 
            XmlSchemaGroupBase groupRefBase = (
                (groupBase is XmlSchemaSequence) ? (XmlSchemaGroupBase)new XmlSchemaSequence() : 
                (groupBase is XmlSchemaChoice)   ? (XmlSchemaGroupBase)new XmlSchemaChoice() : 
                                                   (XmlSchemaGroupBase)new XmlSchemaAll()
            ); 
            groupRefBase.MinOccurs = groupRef.MinOccurs;
            groupRefBase.MaxOccurs = groupRef.MaxOccurs;
            foreach (XmlSchemaParticle particle in groupBase.Items) {
                groupRefBase.Items.Add(particle); 
            }
            groupRef.SetParticle(groupRefBase); 
            return groupRefBase; 
        }
 
        private XmlSchemaParticle CannonicalizeAll(XmlSchemaAll all, bool root, bool substitution) {
            if (all.Items.Count > 0) {
                XmlSchemaAll newAll = new XmlSchemaAll();
                newAll.MinOccurs = all.MinOccurs; 
                newAll.MaxOccurs = all.MaxOccurs;
                newAll.SourceUri = all.SourceUri; // all is the only one that might need and error message 
                newAll.LineNumber = all.LineNumber; 
                newAll.LinePosition = all.LinePosition;
                foreach (XmlSchemaElement e in all.Items) { 
                    XmlSchemaParticle p = CannonicalizeParticle(e, false, substitution);
                    if (p != XmlSchemaParticle.Empty) {
                        newAll.Items.Add(p);
                    } 
                }
                all = newAll; 
            } 
            if (all.Items.Count == 0) {
                return XmlSchemaParticle.Empty; 
            }
            else if (root && all.Items.Count == 1) {
                XmlSchemaSequence newSequence = new XmlSchemaSequence();
                newSequence.MinOccurs = all.MinOccurs; 
                newSequence.MaxOccurs = all.MaxOccurs;
                newSequence.Items.Add((XmlSchemaParticle)all.Items[0]); 
                return newSequence; 
            }
            else if (!root && all.Items.Count == 1 && all.MinOccurs == decimal.One && all.MaxOccurs == decimal.One) { 
                return (XmlSchemaParticle)all.Items[0];
            }
            else if (!root) {
                SendValidationEvent(Res.Sch_NotAllAlone, all); 
                return XmlSchemaParticle.Empty;
            } 
            else { 
                return all;
            } 
        }

        private XmlSchemaParticle CannonicalizeChoice(XmlSchemaChoice choice, bool root, bool substitution) {
            XmlSchemaChoice oldChoice = choice; 
            if (choice.Items.Count > 0) {
                XmlSchemaChoice newChoice = new XmlSchemaChoice(); 
                newChoice.MinOccurs = choice.MinOccurs; 
                newChoice.MaxOccurs = choice.MaxOccurs;
                foreach (XmlSchemaParticle p in choice.Items) { 
                    XmlSchemaParticle p1 = CannonicalizeParticle(p, false, substitution);
                    if (p1 != XmlSchemaParticle.Empty) {
                        if (p1.MinOccurs == decimal.One && p1.MaxOccurs == decimal.One && p1 is XmlSchemaChoice) {
                            foreach (XmlSchemaParticle p2 in ((XmlSchemaChoice)p1).Items) { 
                                newChoice.Items.Add(p2);
                            } 
                        } 
                        else {
                            newChoice.Items.Add(p1); 
                        }
                    }
                }
                choice = newChoice; 
            }
            if (!root && choice.Items.Count == 0) { 
                if (choice.MinOccurs != decimal.Zero) { 
                    SendValidationEvent(Res.Sch_EmptyChoice, oldChoice, XmlSeverityType.Warning);
                } 
                return XmlSchemaParticle.Empty;
            }
            else if (!root && choice.Items.Count == 1 && choice.MinOccurs == decimal.One && choice.MaxOccurs == decimal.One) {
                return (XmlSchemaParticle)choice.Items[0]; 
            }
            else { 
                return choice; 
            }
        } 

        private XmlSchemaParticle CannonicalizeSequence(XmlSchemaSequence sequence, bool root, bool substitution) {
            if (sequence.Items.Count > 0) {
                XmlSchemaSequence newSequence = new XmlSchemaSequence(); 
                newSequence.MinOccurs = sequence.MinOccurs;
                newSequence.MaxOccurs = sequence.MaxOccurs; 
                foreach (XmlSchemaParticle p in sequence.Items) { 
                    XmlSchemaParticle p1 = CannonicalizeParticle(p, false, substitution);
                    if (p1 != XmlSchemaParticle.Empty) { 
                        if (p1.MinOccurs == decimal.One && p1.MaxOccurs == decimal.One && p1 is XmlSchemaSequence) {
                            foreach (XmlSchemaParticle p2 in ((XmlSchemaSequence)p1).Items) {
                                newSequence.Items.Add(p2);
                            } 
                        }
                        else { 
                            newSequence.Items.Add(p1); 
                        }
                    } 
                }
                sequence = newSequence;
            }
            if (sequence.Items.Count == 0) { 
                return XmlSchemaParticle.Empty;
            } 
            else if (!root && sequence.Items.Count == 1 && sequence.MinOccurs == decimal.One && sequence.MaxOccurs == decimal.One) { 
                return (XmlSchemaParticle)sequence.Items[0];
            } 
            else {
                return sequence;
            }
        } 

        private bool IsValidRestriction(XmlSchemaParticle derivedParticle, XmlSchemaParticle baseParticle) { 
            if (derivedParticle == baseParticle) { 
                return true;
            } 
            else if (derivedParticle == null || derivedParticle == XmlSchemaParticle.Empty) {
                return IsParticleEmptiable(baseParticle);
            }
            else if (baseParticle == null || baseParticle == XmlSchemaParticle.Empty) { 
                return false;
            } 
            if (baseParticle is XmlSchemaElement) { 
                if (derivedParticle is XmlSchemaElement) {
                    return IsElementFromElement((XmlSchemaElement)derivedParticle, (XmlSchemaElement)baseParticle); 
                }
                else {
                    return false;
                } 
            }
            else if (baseParticle is XmlSchemaAny) { 
                if (derivedParticle is XmlSchemaElement) { 
                    return IsElementFromAny((XmlSchemaElement)derivedParticle, (XmlSchemaAny)baseParticle);
                } 
                else if (derivedParticle is XmlSchemaAny) {
                    return IsAnyFromAny((XmlSchemaAny)derivedParticle, (XmlSchemaAny)baseParticle);
                }
                else { 
                    return IsGroupBaseFromAny((XmlSchemaGroupBase)derivedParticle, (XmlSchemaAny)baseParticle);
                } 
            } 
            else if (baseParticle is XmlSchemaAll) {
                if (derivedParticle is XmlSchemaElement) { 
                    return IsElementFromGroupBase((XmlSchemaElement)derivedParticle, (XmlSchemaGroupBase)baseParticle, true);
                }
                else if (derivedParticle is XmlSchemaAll) {
                    return IsGroupBaseFromGroupBase((XmlSchemaGroupBase)derivedParticle, (XmlSchemaGroupBase)baseParticle, true); 
                }
                else if (derivedParticle is XmlSchemaSequence) { 
                    return IsSequenceFromAll((XmlSchemaSequence)derivedParticle, (XmlSchemaAll)baseParticle); 
                }
            } 
            else if (baseParticle is XmlSchemaChoice ) {
                if (derivedParticle is XmlSchemaElement) {
                    return IsElementFromGroupBase((XmlSchemaElement)derivedParticle, (XmlSchemaGroupBase)baseParticle, false);
                } 
                else if (derivedParticle is XmlSchemaChoice) {
                    return IsGroupBaseFromGroupBase((XmlSchemaGroupBase)derivedParticle, (XmlSchemaGroupBase)baseParticle, false); 
                } 
                else if (derivedParticle is XmlSchemaSequence) {
                    return IsSequenceFromChoice((XmlSchemaSequence)derivedParticle, (XmlSchemaChoice)baseParticle); 
                }
            }
            else if (baseParticle is XmlSchemaSequence) {
                if (derivedParticle is XmlSchemaElement) { 
                    return IsElementFromGroupBase((XmlSchemaElement)derivedParticle, (XmlSchemaGroupBase)baseParticle, true);
                } 
                else if (derivedParticle is XmlSchemaSequence) { 
                    return IsGroupBaseFromGroupBase((XmlSchemaGroupBase)derivedParticle, (XmlSchemaGroupBase)baseParticle, true);
                } 
            }
            else {
                Debug.Assert(false);
            } 

            return false; 
        } 

        private bool IsElementFromElement(XmlSchemaElement derivedElement, XmlSchemaElement baseElement) { 
            return  (derivedElement.QualifiedName == baseElement.QualifiedName) &&
                    (derivedElement.IsNillable == baseElement.IsNillable) &&
                    IsValidOccurrenceRangeRestriction(derivedElement, baseElement) &&
                    (baseElement.FixedValue == null || baseElement.FixedValue == derivedElement.FixedValue) && 
                    ((derivedElement.BlockResolved | baseElement.BlockResolved) ==  derivedElement.BlockResolved) &&
                    (derivedElement.ElementSchemaType != null) && (baseElement.ElementSchemaType != null) && 
                    XmlSchemaType.IsDerivedFrom(derivedElement.ElementSchemaType, baseElement.ElementSchemaType, ~XmlSchemaDerivationMethod.Restriction); 
        }
 
        private bool IsElementFromAny(XmlSchemaElement derivedElement, XmlSchemaAny baseAny) {
            return baseAny.Allows(derivedElement.QualifiedName) &&
                IsValidOccurrenceRangeRestriction(derivedElement, baseAny);
        } 

        private bool IsAnyFromAny(XmlSchemaAny derivedAny, XmlSchemaAny baseAny) { 
            return IsValidOccurrenceRangeRestriction(derivedAny, baseAny) && 
                NamespaceList.IsSubset(derivedAny.NamespaceList, baseAny.NamespaceList);
        } 

        private bool IsGroupBaseFromAny(XmlSchemaGroupBase derivedGroupBase, XmlSchemaAny baseAny) {
            decimal minOccurs, maxOccurs;
            CalculateEffectiveTotalRange(derivedGroupBase, out minOccurs, out maxOccurs); 
            if (!IsValidOccurrenceRangeRestriction(minOccurs, maxOccurs, baseAny.MinOccurs, baseAny.MaxOccurs)) {
                return false; 
            } 
            // eliminate occurrance range check
            string minOccursAny = baseAny.MinOccursString; 
            baseAny.MinOccurs = decimal.Zero;

            foreach (XmlSchemaParticle p in derivedGroupBase.Items) {
                if (!IsValidRestriction(p, baseAny)) { 
                    baseAny.MinOccursString = minOccursAny;
                    return false; 
                } 
            }
            baseAny.MinOccursString = minOccursAny; 
            return true;
        }

        private bool IsElementFromGroupBase(XmlSchemaElement derivedElement, XmlSchemaGroupBase baseGroupBase,  bool skipEmptableOnly) { 
            bool isMatched = false;
            foreach(XmlSchemaParticle baseParticle in baseGroupBase.Items) { 
                if (!isMatched) { 
                    string minOccursElement = baseParticle.MinOccursString;
                    string maxOccursElement = baseParticle.MaxOccursString; 
                    baseParticle.MinOccurs *= baseGroupBase.MinOccurs;
                    if ( baseParticle.MaxOccurs != decimal.MaxValue) {
                        if (baseGroupBase.MaxOccurs == decimal.MaxValue)
                             baseParticle.MaxOccurs = decimal.MaxValue; 
                        else
                             baseParticle.MaxOccurs *= baseGroupBase.MaxOccurs; 
                    } 
                    isMatched  = IsValidRestriction(derivedElement, baseParticle);
                    baseParticle.MinOccursString = minOccursElement; 
                    baseParticle.MaxOccursString = maxOccursElement;
                }
                else if (skipEmptableOnly && !IsParticleEmptiable(baseParticle)) {
                    return false; 
                }
            } 
            return isMatched; 
        }
 
        private bool IsGroupBaseFromGroupBase(XmlSchemaGroupBase derivedGroupBase, XmlSchemaGroupBase baseGroupBase,  bool skipEmptableOnly) {
            if (!IsValidOccurrenceRangeRestriction(derivedGroupBase, baseGroupBase) || derivedGroupBase.Items.Count > baseGroupBase.Items.Count) {
                return false;
            } 
            int count = 0;
            foreach(XmlSchemaParticle baseParticle in baseGroupBase.Items) { 
                if ((count < derivedGroupBase.Items.Count) && IsValidRestriction((XmlSchemaParticle)derivedGroupBase.Items[count], baseParticle)) { 
                    count ++;
                } 
                else if (skipEmptableOnly && !IsParticleEmptiable(baseParticle)) {
                    return false;
                }
            } 
            if (count < derivedGroupBase.Items.Count) {
                return false; 
            } 
            return true;
        } 

        private bool IsSequenceFromAll(XmlSchemaSequence derivedSequence, XmlSchemaAll baseAll) {
            if (!IsValidOccurrenceRangeRestriction(derivedSequence, baseAll) || derivedSequence.Items.Count > baseAll.Items.Count) {
                return false; 
            }
            BitSet map = new BitSet(baseAll.Items.Count); 
            foreach (XmlSchemaParticle p in derivedSequence.Items) { 
                int i = GetMappingParticle(p, baseAll.Items);
                if (i >= 0) { 
                    if (map[i]) {
                        return false;
                    }
                    else { 
                        map.Set(i);
                    } 
                } 
                else {
                    return false; 
                }
            }
            for (int i = 0; i < baseAll.Items.Count; i++) {
                if (!map[i] && !IsParticleEmptiable((XmlSchemaParticle)baseAll.Items[i])) { 
                    return false;
                } 
            } 
            return true;
        } 

        private bool IsSequenceFromChoice(XmlSchemaSequence derivedSequence, XmlSchemaChoice baseChoice) {
            decimal minOccurs, maxOccurs;
            CalculateSequenceRange(derivedSequence, out minOccurs, out maxOccurs); 
            if (!IsValidOccurrenceRangeRestriction(minOccurs, maxOccurs, baseChoice.MinOccurs, baseChoice.MaxOccurs) || derivedSequence.Items.Count > baseChoice.Items.Count) {
                return false; 
            } 
            foreach (XmlSchemaParticle particle in derivedSequence.Items) {
                if (GetMappingParticle(particle, baseChoice.Items) < 0) 
                    return false;
            }
            return true;
        } 

        private void CalculateSequenceRange(XmlSchemaSequence sequence, out decimal minOccurs, out decimal maxOccurs) { 
            minOccurs = decimal.Zero; maxOccurs = decimal.Zero; 
            foreach (XmlSchemaParticle p in sequence.Items) {
                minOccurs += p.MinOccurs; 
                if (p.MaxOccurs == decimal.MaxValue)
                    maxOccurs = decimal.MaxValue;
                else if (maxOccurs != decimal.MaxValue)
                    maxOccurs += p.MaxOccurs; 
            }
            minOccurs *= sequence.MinOccurs; 
            if (sequence.MaxOccurs == decimal.MaxValue) { 
                maxOccurs = decimal.MaxValue;
            } 
            else if (maxOccurs != decimal.MaxValue) {
                maxOccurs *= sequence.MaxOccurs;
            }
        } 

        private bool IsValidOccurrenceRangeRestriction(XmlSchemaParticle derivedParticle, XmlSchemaParticle baseParticle) { 
            return IsValidOccurrenceRangeRestriction(derivedParticle.MinOccurs, derivedParticle.MaxOccurs, baseParticle.MinOccurs, baseParticle.MaxOccurs); 
        }
 
        private bool IsValidOccurrenceRangeRestriction(decimal minOccurs, decimal maxOccurs, decimal baseMinOccurs, decimal baseMaxOccurs) {
            return (baseMinOccurs <= minOccurs) && (maxOccurs <= baseMaxOccurs);
        }
 
        private int GetMappingParticle(XmlSchemaParticle particle, XmlSchemaObjectCollection collection) {
            for (int i = 0; i < collection.Count; i++) { 
                if (IsValidRestriction(particle, (XmlSchemaParticle)collection[i])) 
                    return i;
            } 
            return -1;
        }

        private bool IsParticleEmptiable(XmlSchemaParticle particle) { 
            decimal minOccurs, maxOccurs;
            CalculateEffectiveTotalRange(particle, out minOccurs, out maxOccurs); 
            return minOccurs == decimal.Zero; 
        }
 
        private void CalculateEffectiveTotalRange(XmlSchemaParticle particle, out decimal minOccurs, out decimal maxOccurs) {
            if (particle is XmlSchemaElement || particle is XmlSchemaAny) {
                minOccurs = particle.MinOccurs;
                maxOccurs = particle.MaxOccurs; 
            }
            else if (particle is XmlSchemaChoice) { 
                if (((XmlSchemaChoice)particle).Items.Count == 0) { 
                    minOccurs = maxOccurs = decimal.Zero;
                } 
                else {
                    minOccurs = decimal.MaxValue;
                    maxOccurs = decimal.Zero;
                    foreach (XmlSchemaParticle p in ((XmlSchemaChoice)particle).Items) { 
                        decimal min, max;
                        CalculateEffectiveTotalRange(p, out min, out max); 
                        if (min < minOccurs) { 
                            minOccurs = min;
                        } 
                        if (max > maxOccurs) {
                            maxOccurs = max;
                        }
                    } 
                    minOccurs *= particle.MinOccurs;
                    if (maxOccurs != decimal.MaxValue) { 
                        if (particle.MaxOccurs == decimal.MaxValue) 
                            maxOccurs = decimal.MaxValue;
                        else 
                            maxOccurs *= particle.MaxOccurs;
                    }
                }
            } 
            else {
                XmlSchemaObjectCollection collection = ((XmlSchemaGroupBase)particle).Items; 
                if (collection.Count == 0) { 
                    minOccurs = maxOccurs = decimal.Zero;
                } 
                else {
                    minOccurs = 0;
                    maxOccurs = 0;
                    foreach (XmlSchemaParticle p in collection) { 
                        decimal min, max;
                        CalculateEffectiveTotalRange(p, out min, out max); 
                        minOccurs += min; 
                        if (maxOccurs != decimal.MaxValue) {
                            if (max == decimal.MaxValue) 
                                maxOccurs = decimal.MaxValue;
                            else
                                maxOccurs += max;
                        } 
                    }
                    minOccurs *= particle.MinOccurs; 
                    if (maxOccurs != decimal.MaxValue) { 
                        if (particle.MaxOccurs == decimal.MaxValue)
                            maxOccurs = decimal.MaxValue; 
                        else
                            maxOccurs *= particle.MaxOccurs;
                    }
                } 
            }
        } 
 
        private void PushComplexType(XmlSchemaComplexType complexType) {
            this.complexTypeStack.Push(complexType); 
        }

        private XmlSchemaContentType GetSchemaContentType(XmlSchemaComplexType complexType, XmlSchemaComplexContent complexContent, XmlSchemaParticle particle) {
            if ((complexContent != null && complexContent.IsMixed) || 
                (complexContent == null && complexType.IsMixed)) {
                return XmlSchemaContentType.Mixed; 
            } 
            else if (particle != null && !particle.IsEmpty) {
                return XmlSchemaContentType.ElementOnly; 
            }
            else {
                return XmlSchemaContentType.Empty;
            } 
        }
 
        private void CompileAttributeGroup(XmlSchemaAttributeGroup attributeGroup) { 
            if (attributeGroup.IsProcessing) {
                SendValidationEvent(Res.Sch_AttributeGroupCircularRef, attributeGroup); 
                return;
            }
            if (attributeGroup.AttributeUses.Count > 0) {// already checked
                return; 
            }
            attributeGroup.IsProcessing = true; 
            XmlSchemaAnyAttribute anyAttribute = attributeGroup.AnyAttribute; 
            foreach (XmlSchemaObject obj in attributeGroup.Attributes) {
                if (obj is XmlSchemaAttribute) { 
                    XmlSchemaAttribute attribute = (XmlSchemaAttribute)obj;
                    if (attribute.Use != XmlSchemaUse.Prohibited) {
                        CompileAttribute(attribute);
                    } 
                    if (attributeGroup.AttributeUses[attribute.QualifiedName] == null) {
                        attributeGroup.AttributeUses.Add(attribute.QualifiedName, attribute); 
                    } 
                    else  {
                        SendValidationEvent(Res.Sch_DupAttributeUse, attribute.QualifiedName.ToString(), attribute); 
                    }
                }
                else { // XmlSchemaAttributeGroupRef
                    XmlSchemaAttributeGroupRef attributeGroupRef = (XmlSchemaAttributeGroupRef)obj; 
                    XmlSchemaAttributeGroup attributeGroupResolved;
                    if (attributeGroup.Redefined != null && attributeGroupRef.RefName == attributeGroup.Redefined.QualifiedName) { 
                        attributeGroupResolved = (XmlSchemaAttributeGroup)attributeGroup.Redefined; 
                    }
                    else { 
                        attributeGroupResolved = (XmlSchemaAttributeGroup)this.schema.AttributeGroups[attributeGroupRef.RefName];
                    }
                    if (attributeGroupResolved != null) {
                        CompileAttributeGroup(attributeGroupResolved); 
                        foreach (XmlSchemaAttribute attribute in attributeGroupResolved.AttributeUses.Values) {
                            if (attributeGroup.AttributeUses[attribute.QualifiedName] == null) { 
                                attributeGroup.AttributeUses.Add(attribute.QualifiedName, attribute); 
                            }
                            else { 
                                SendValidationEvent(Res.Sch_DupAttributeUse, attribute.QualifiedName.ToString(), attribute);
                            }
                        }
                        anyAttribute = CompileAnyAttributeIntersection(anyAttribute, attributeGroupResolved.AttributeWildcard); 
                    }
                    else { 
                        SendValidationEvent(Res.Sch_UndefAttributeGroupRef, attributeGroupRef.RefName.ToString(), attributeGroupRef); 
                    }
                } 
            }
            attributeGroup.AttributeWildcard = anyAttribute;
            attributeGroup.IsProcessing = false;
 
        }
 
        private void CompileLocalAttributes(XmlSchemaComplexType baseType, XmlSchemaComplexType derivedType, XmlSchemaObjectCollection attributes, XmlSchemaAnyAttribute anyAttribute, XmlSchemaDerivationMethod derivedBy) { 
            XmlSchemaAnyAttribute baseAttributeWildcard = baseType != null ? baseType.AttributeWildcard : null;
            foreach (XmlSchemaObject obj in attributes) { 
                if (obj is XmlSchemaAttribute) {
                    XmlSchemaAttribute attribute = (XmlSchemaAttribute)obj;
                    if (attribute.Use != XmlSchemaUse.Prohibited) {
                        CompileAttribute(attribute); 
                    }
                    if (attribute.Use != XmlSchemaUse.Prohibited || 
                        (attribute.Use == XmlSchemaUse.Prohibited && derivedBy == XmlSchemaDerivationMethod.Restriction && baseType != XmlSchemaComplexType.AnyType)) { 

                        if (derivedType.AttributeUses[attribute.QualifiedName] == null) { 
                            derivedType.AttributeUses.Add(attribute.QualifiedName, attribute);
                        }
                        else  {
                            SendValidationEvent(Res.Sch_DupAttributeUse, attribute.QualifiedName.ToString(), attribute); 
                        }
                    } 
                    else { 
                        SendValidationEvent(Res.Sch_AttributeIgnored, attribute.QualifiedName.ToString(), attribute, XmlSeverityType.Warning);
                    } 

                }
                else { // is XmlSchemaAttributeGroupRef
                    XmlSchemaAttributeGroupRef attributeGroupRef = (XmlSchemaAttributeGroupRef)obj; 
                    XmlSchemaAttributeGroup attributeGroup = (XmlSchemaAttributeGroup)this.schema.AttributeGroups[attributeGroupRef.RefName];
                    if (attributeGroup != null) { 
                        CompileAttributeGroup(attributeGroup); 
                        foreach (XmlSchemaAttribute attribute in attributeGroup.AttributeUses.Values) {
                          if (attribute.Use != XmlSchemaUse.Prohibited || 
                             (attribute.Use == XmlSchemaUse.Prohibited && derivedBy == XmlSchemaDerivationMethod.Restriction && baseType != XmlSchemaComplexType.AnyType)) {
                            if (derivedType.AttributeUses[attribute.QualifiedName] == null) {
                                derivedType.AttributeUses.Add(attribute.QualifiedName, attribute);
                            } 
                            else {
                                SendValidationEvent(Res.Sch_DupAttributeUse, attribute.QualifiedName.ToString(), attributeGroupRef); 
                            } 
                          }
                          else { 
                            SendValidationEvent(Res.Sch_AttributeIgnored, attribute.QualifiedName.ToString(), attribute, XmlSeverityType.Warning);
                          }

                        } 
                        anyAttribute = CompileAnyAttributeIntersection(anyAttribute, attributeGroup.AttributeWildcard);
                    } 
                    else { 
                        SendValidationEvent(Res.Sch_UndefAttributeGroupRef, attributeGroupRef.RefName.ToString(), attributeGroupRef);
                    } 
                }
            }

            // check derivation rules 
            if (baseType != null) {
                if (derivedBy == XmlSchemaDerivationMethod.Extension) { 
                    derivedType.SetAttributeWildcard(CompileAnyAttributeUnion(anyAttribute, baseAttributeWildcard)); 
                    foreach(XmlSchemaAttribute attributeBase in baseType.AttributeUses.Values) {
                        XmlSchemaAttribute attribute = (XmlSchemaAttribute)derivedType.AttributeUses[attributeBase.QualifiedName]; 
                        if (attribute != null) {
                            Debug.Assert(attribute.Use != XmlSchemaUse.Prohibited);
                            if (attribute.AttributeSchemaType != attributeBase.AttributeSchemaType || attributeBase.Use == XmlSchemaUse.Prohibited) {
                                SendValidationEvent(Res.Sch_InvalidAttributeExtension, attribute); 
                            }
                        } 
                        else { 
                            derivedType.AttributeUses.Add(attributeBase.QualifiedName, attributeBase);
                        } 
                    }
                }
                else {  // derivedBy == XmlSchemaDerivationMethod.Restriction
                    // Schema Component Constraint: Derivation Valid (Restriction, Complex) 
                    if ((anyAttribute != null) && (baseAttributeWildcard == null || !XmlSchemaAnyAttribute.IsSubset(anyAttribute, baseAttributeWildcard))) {
                        SendValidationEvent(Res.Sch_InvalidAnyAttributeRestriction, derivedType); 
                    } 
                    else {
                        derivedType.SetAttributeWildcard(anyAttribute); //complete wildcard 
                    }

                    // Add form the base
                    foreach(XmlSchemaAttribute attributeBase in baseType.AttributeUses.Values) { 
                        XmlSchemaAttribute attribute = (XmlSchemaAttribute)derivedType.AttributeUses[attributeBase.QualifiedName];
                        if (attribute == null) { 
                            derivedType.AttributeUses.Add(attributeBase.QualifiedName, attributeBase); 
                        }
                        else { 
                            if (attributeBase.Use == XmlSchemaUse.Prohibited && attribute.Use != XmlSchemaUse.Prohibited) {
#if DEBUG
                                string position = string.Empty;
                                if (derivedType.SourceUri != null) { 
                                    position = " in " + derivedType.SourceUri + "(" + derivedType.LineNumber + ", " + derivedType.LinePosition + ")";
                                } 
                                Debug.WriteLineIf(DiagnosticsSwitches.XmlSchema.TraceError, "Invalid complexType attributes restriction" + position); 
                                Debug.WriteLineIf(DiagnosticsSwitches.XmlSchema.TraceError, "     Base    " + DumpAttributes(baseType.AttributeUses, baseType.AttributeWildcard));
                                Debug.WriteLineIf(DiagnosticsSwitches.XmlSchema.TraceError, "     Derived " + DumpAttributes(derivedType.AttributeUses, derivedType.AttributeWildcard)); 
#endif
                                SendValidationEvent(Res.Sch_AttributeRestrictionProhibited, attribute);
                            }
                            else if (attribute.Use == XmlSchemaUse.Prohibited) { 
                                continue;
                            } 
                            else if (attributeBase.AttributeSchemaType == null || attribute.AttributeSchemaType == null || !XmlSchemaType.IsDerivedFrom(attribute.AttributeSchemaType, attributeBase.AttributeSchemaType, XmlSchemaDerivationMethod.Empty)) { 
                                SendValidationEvent(Res.Sch_AttributeRestrictionInvalid, attribute);
                            } 
                        }
                    }

                    // Check additional ones are valid restriction of base's wildcard 
                    foreach(XmlSchemaAttribute attribute in derivedType.AttributeUses.Values) {
                        XmlSchemaAttribute attributeBase = (XmlSchemaAttribute)baseType.AttributeUses[attribute.QualifiedName]; 
                        if (attributeBase != null) { 
                            continue;
                        } 
                        if (baseAttributeWildcard == null || !baseAttributeWildcard.Allows(attribute.QualifiedName)) {
#if DEBUG
                            string position = string.Empty;
                            if (derivedType.SourceUri != null) { 
                                position = " in " + derivedType.SourceUri + "(" + derivedType.LineNumber + ", " + derivedType.LinePosition + ")";
                            } 
                            Debug.WriteLineIf(DiagnosticsSwitches.XmlSchema.TraceError, "Invalid complexType attributes restriction" + position); 
                            Debug.WriteLineIf(DiagnosticsSwitches.XmlSchema.TraceError, "     Base    " + DumpAttributes(baseType.AttributeUses, baseType.AttributeWildcard));
                            Debug.WriteLineIf(DiagnosticsSwitches.XmlSchema.TraceError, "     Derived " + DumpAttributes(derivedType.AttributeUses, derivedType.AttributeWildcard)); 
#endif
                            SendValidationEvent(Res.Sch_AttributeRestrictionInvalidFromWildcard, attribute);
                        }
                    } 
                }
            } 
            else { 
                derivedType.SetAttributeWildcard(anyAttribute);
            } 
       }


#if DEBUG 
        private string DumpAttributes(XmlSchemaObjectTable attributeUses, XmlSchemaAnyAttribute attributeWildcard) {
            StringBuilder sb = new StringBuilder(); 
            sb.Append("["); 
            bool first = true;
            foreach (XmlSchemaAttribute attribute in attributeUses.Values) { 
                if (attribute.Use != XmlSchemaUse.Prohibited) {
                    if (first) {
                        first = false;
                    } 
                    else {
                        sb.Append(" "); 
                    } 
                    sb.Append(attribute.QualifiedName.Name);
                    if (attribute.Use == XmlSchemaUse.Optional) { 
                        sb.Append("?");
                    }
                }
            } 
            if (attributeWildcard != null) {
                if (attributeUses.Count != 0) { 
                    sb.Append(" "); 
                }
                sb.Append("<"); 
                sb.Append(attributeWildcard.NamespaceList.ToString());
                sb.Append(">");
            }
            sb.Append("] - ["); 
            first = true;
            foreach (XmlSchemaAttribute attribute in attributeUses.Values) { 
                if (attribute.Use == XmlSchemaUse.Prohibited) { 
                    if (first) {
                        first = false; 
                    }
                    else {
                        sb.Append(" ");
                    } 
                    sb.Append(attribute.QualifiedName.Name);
                } 
            } 
            sb.Append("]");
            return sb.ToString(); 
        }
#endif

        private XmlSchemaAnyAttribute CompileAnyAttributeUnion(XmlSchemaAnyAttribute a, XmlSchemaAnyAttribute b) { 
            if (a == null) {
                return b; 
            } 
            else if (b == null) {
                return a; 
            }
            else {
                XmlSchemaAnyAttribute attribute = XmlSchemaAnyAttribute.Union(a, b, true); //true for v1Compat
                if (attribute == null) { 
                    SendValidationEvent(Res.Sch_UnexpressibleAnyAttribute, a);
                } 
                return attribute; 
            }
 
        }

        private XmlSchemaAnyAttribute CompileAnyAttributeIntersection(XmlSchemaAnyAttribute a, XmlSchemaAnyAttribute b) {
            if (a == null) { 
                return b;
            } 
            else if (b == null) { 
                return a;
            } 
            else {
                XmlSchemaAnyAttribute attribute = XmlSchemaAnyAttribute.Intersection(a, b, true); //true for v1Compat
                if (attribute == null) {
                    SendValidationEvent(Res.Sch_UnexpressibleAnyAttribute, a); 
                }
                return attribute; 
            } 
        }
 
         private void CompileAttribute(XmlSchemaAttribute xa) {
            if (xa.IsProcessing) {
                SendValidationEvent(Res.Sch_AttributeCircularRef, xa);
                return; 
            }
            if (xa.AttDef != null) { //already compiled? 
                return; 
            }
            xa.IsProcessing = true; 
            SchemaAttDef decl = null;
            try {
                if (!xa.RefName.IsEmpty) {
                    XmlSchemaAttribute a = (XmlSchemaAttribute)this.schema.Attributes[xa.RefName]; 
                    if (a == null) {
                        throw new XmlSchemaException(Res.Sch_UndeclaredAttribute, xa.RefName.ToString(), xa); 
                    } 
                    CompileAttribute(a);
                    if (a.AttDef == null) { 
                        throw new XmlSchemaException(Res.Sch_RefInvalidAttribute, xa.RefName.ToString(), xa);
                    }
                    decl = a.AttDef.Clone();
                    if(decl.Datatype != null) { 
                        if(a.FixedValue != null) {
                            if(xa.DefaultValue != null) { 
                                throw new XmlSchemaException(Res.Sch_FixedDefaultInRef, xa.RefName.ToString(), xa); 
                            }
                            else if(xa.FixedValue != null ) { 
                                if (xa.FixedValue != a.FixedValue) {
                                    throw new XmlSchemaException(Res.Sch_FixedInRef, xa.RefName.ToString(), xa);
                                }
                            } 
                            else {
                                decl.Presence = SchemaDeclBase.Use.Fixed; 
                                decl.DefaultValueRaw = decl.DefaultValueExpanded = a.FixedValue; 
                                decl.DefaultValueTyped = decl.Datatype.ParseValue(decl.DefaultValueRaw, NameTable, new SchemaNamespaceManager(xa), true);
                            } 
                        }
                        else if (a.DefaultValue != null) {
                            if(xa.DefaultValue == null && xa.FixedValue == null) {
                                decl.Presence = SchemaDeclBase.Use.Default; 
                                decl.DefaultValueRaw = decl.DefaultValueExpanded = a.DefaultValue;
                                decl.DefaultValueTyped = decl.Datatype.ParseValue(decl.DefaultValueRaw, NameTable, new SchemaNamespaceManager(xa), true); 
                            } 
                        }
                    } 
                    xa.SetAttributeType(a.AttributeSchemaType);
                }
                else {
                    decl = new SchemaAttDef(xa.QualifiedName, xa.Prefix); 
                    if (xa.SchemaType != null) {
                        CompileSimpleType(xa.SchemaType); 
                        xa.SetAttributeType(xa.SchemaType); 
                        decl.SchemaType = xa.SchemaType;
                        decl.Datatype = xa.SchemaType.Datatype; 
                    }
                    else if (!xa.SchemaTypeName.IsEmpty) {
                        XmlSchemaSimpleType simpleType = GetSimpleType(xa.SchemaTypeName);
                        if (simpleType != null) { 
                            xa.SetAttributeType(simpleType);
                            decl.Datatype = simpleType.Datatype; 
                            decl.SchemaType = simpleType; 
                        }
                        else { 
                            throw new XmlSchemaException(Res.Sch_UndeclaredSimpleType, xa.SchemaTypeName.ToString(), xa);
                        }
                    }
                    else { 
                        decl.SchemaType = DatatypeImplementation.AnySimpleType;
                        decl.Datatype = DatatypeImplementation.AnySimpleType.Datatype; 
                        xa.SetAttributeType(DatatypeImplementation.AnySimpleType); 
                    }
                } 
                if (decl.Datatype != null) {
                    decl.Datatype.VerifySchemaValid(this.schema.Notations, xa);
                }
                if (xa.DefaultValue != null || xa.FixedValue != null) { 
                    if (xa.DefaultValue != null) {
                        decl.Presence = SchemaDeclBase.Use.Default; 
                        decl.DefaultValueRaw = decl.DefaultValueExpanded = xa.DefaultValue; 
                    }
                    else { 
                        decl.Presence = SchemaDeclBase.Use.Fixed;
                        decl.DefaultValueRaw = decl.DefaultValueExpanded = xa.FixedValue;
                    }
                    if(decl.Datatype != null) { 
                        decl.DefaultValueTyped = decl.Datatype.ParseValue(decl.DefaultValueRaw, NameTable, new SchemaNamespaceManager(xa), true);
                    } 
                } 
                else {
                    switch (xa.Use) { 
                        case XmlSchemaUse.None:
                        case XmlSchemaUse.Optional:
                            decl.Presence = SchemaDeclBase.Use.Implied;
                            break; 
                        case XmlSchemaUse.Required:
                            decl.Presence = SchemaDeclBase.Use.Required; 
                            break; 
                        case XmlSchemaUse.Prohibited:
                            break; 
                    }
                }
                decl.SchemaAttribute = xa; //So this is available for PSVI
                xa.AttDef = decl; 
            }
            catch (XmlSchemaException e) { 
                if (e.SourceSchemaObject == null) { 
                    e.SetSource(xa);
                } 
                SendValidationEvent(e);
                xa.AttDef = SchemaAttDef.Empty;
            }
            finally { 
                xa.IsProcessing = false;
            } 
        } 

        private void CompileIdentityConstraint (XmlSchemaIdentityConstraint xi) { 
            if (xi.IsProcessing) {
                xi.CompiledConstraint = CompiledIdentityConstraint.Empty;
                SendValidationEvent(Res.Sch_IdentityConstraintCircularRef, xi);
                return; 
            }
 
            if (xi.CompiledConstraint != null) { 
                return;
            } 

            xi.IsProcessing = true;
            CompiledIdentityConstraint compic = null;
            try { 
                SchemaNamespaceManager xnmgr = new SchemaNamespaceManager(xi);
                compic = new CompiledIdentityConstraint(xi, xnmgr); 
                if (xi is XmlSchemaKeyref) { 
                    XmlSchemaIdentityConstraint ic = (XmlSchemaIdentityConstraint)this.schema.IdentityConstraints[((XmlSchemaKeyref)xi).Refer];
                    if (ic == null) { 
                        throw new XmlSchemaException(Res.Sch_UndeclaredIdentityConstraint, ((XmlSchemaKeyref)xi).Refer.ToString(), xi);
                    }
                    CompileIdentityConstraint(ic);
                    if (ic.CompiledConstraint == null) { 
                        throw new XmlSchemaException(Res.Sch_RefInvalidIdentityConstraint, ((XmlSchemaKeyref)xi).Refer.ToString(), xi);
                    } 
                    // keyref has the different cardinality with the key it referred 
                    if (ic.Fields.Count != xi.Fields.Count) {
                        throw new XmlSchemaException(Res.Sch_RefInvalidCardin, xi.QualifiedName.ToString(), xi); 
                    }
                    // keyref can only refer to key/unique
                    if (ic.CompiledConstraint.Role == CompiledIdentityConstraint.ConstraintRole.Keyref) {
                        throw new XmlSchemaException(Res.Sch_ReftoKeyref, xi.QualifiedName.ToString(), xi); 
                    }
                } 
                xi.CompiledConstraint = compic; 
            }
            catch (XmlSchemaException e) { 
                if (e.SourceSchemaObject == null) {
                    e.SetSource(xi);
                }
                SendValidationEvent(e); 
                xi.CompiledConstraint = CompiledIdentityConstraint.Empty;
                // empty is better than null here, stop quickly when circle referencing 
            } 
            finally {
                xi.IsProcessing = false; 
            }

        }
 
        private void CompileElement(XmlSchemaElement xe) {
            if (xe.IsProcessing) { 
                SendValidationEvent(Res.Sch_ElementCircularRef, xe); 
                return;
            } 
            if (xe.ElementDecl != null) {
                return;
            }
            xe.IsProcessing = true; 
            SchemaElementDecl decl = null;
            try { 
                if (!xe.RefName.IsEmpty) { 
                    XmlSchemaElement e = (XmlSchemaElement)this.schema.Elements[xe.RefName];
                    if (e == null) { 
                        throw new XmlSchemaException(Res.Sch_UndeclaredElement, xe.RefName.ToString(), xe);
                    }
                    CompileElement(e);
                    if (e.ElementDecl == null) { 
                        throw new XmlSchemaException(Res.Sch_RefInvalidElement, xe.RefName.ToString(), xe);
                    } 
                    xe.SetElementType(e.ElementSchemaType); 
                    decl = e.ElementDecl.Clone();
                } 
                else {
                    if (xe.SchemaType != null) {
                        xe.SetElementType(xe.SchemaType);
                    } 
                    else if (!xe.SchemaTypeName.IsEmpty) {
                        xe.SetElementType(GetAnySchemaType(xe.SchemaTypeName)); 
                        if (xe.ElementSchemaType == null) { 
                            throw new XmlSchemaException(Res.Sch_UndeclaredType, xe.SchemaTypeName.ToString(), xe);
                        } 
                    }
                    else  if (!xe.SubstitutionGroup.IsEmpty) {
                        XmlSchemaElement examplar = (XmlSchemaElement)this.schema.Elements[xe.SubstitutionGroup];
                        if (examplar == null) { 
                            throw new XmlSchemaException(Res.Sch_UndeclaredEquivClass, xe.SubstitutionGroup.Name.ToString(CultureInfo.InvariantCulture), xe);
                        } 
                        if (examplar.IsProcessing) { //Circular subst group; already detected by now 
                            return;
                        } 
                        CompileElement(examplar);
                        if (examplar.ElementDecl == null) { //If head is invalid, fall back to AnyType
                            xe.SetElementType(XmlSchemaComplexType.AnyType);
                            decl = XmlSchemaComplexType.AnyType.ElementDecl.Clone(); 
                        }
                        else { 
                            xe.SetElementType(examplar.ElementSchemaType); 
                            decl = examplar.ElementDecl.Clone();
                        } 
                    }
                    else {
                        xe.SetElementType(XmlSchemaComplexType.AnyType);
                        decl = XmlSchemaComplexType.AnyType.ElementDecl.Clone(); 
                    }
 
                    if (decl == null) { 
                        Debug.Assert(xe.ElementSchemaType != null);
                        if (xe.ElementSchemaType is XmlSchemaComplexType) { 
                            XmlSchemaComplexType complexType = (XmlSchemaComplexType)xe.ElementSchemaType;
                            CompileComplexType(complexType);
                            if (complexType.ElementDecl != null) {
                                decl = complexType.ElementDecl.Clone(); 
//                                decl.LocalElements = complexType.LocalElementDecls;
                            } 
                        } 
                        else if (xe.ElementSchemaType is XmlSchemaSimpleType) {
                            XmlSchemaSimpleType simpleType = (XmlSchemaSimpleType)xe.ElementSchemaType; 
                            CompileSimpleType(simpleType);
                            if (simpleType.ElementDecl != null) {
                                decl = simpleType.ElementDecl.Clone();
                            } 
                        }
                    } 
                    decl.Name = xe.QualifiedName; 
                    decl.IsAbstract = xe.IsAbstract;
                    XmlSchemaComplexType ct = xe.ElementSchemaType as XmlSchemaComplexType; 
                    if (ct != null) {
                        decl.IsAbstract |= ct.IsAbstract;
                    }
                    decl.IsNillable = xe.IsNillable; 
                    decl.Block |= xe.BlockResolved;
                } 
                if (decl.Datatype != null) { 
                    decl.Datatype.VerifySchemaValid(this.schema.Notations, xe);
                } 

                if (xe.DefaultValue != null || xe.FixedValue != null) {
                    if (decl.ContentValidator != null) {
                        if (decl.ContentValidator.ContentType == XmlSchemaContentType.TextOnly) { 
                            if (xe.DefaultValue != null) {
                                decl.Presence = SchemaDeclBase.Use.Default; 
                                decl.DefaultValueRaw = xe.DefaultValue; 
                            }
                            else { 
                                decl.Presence = SchemaDeclBase.Use.Fixed;
                                decl.DefaultValueRaw = xe.FixedValue;
                            }
                            if (decl.Datatype != null) { 
                                decl.DefaultValueTyped = decl.Datatype.ParseValue(decl.DefaultValueRaw, NameTable, new SchemaNamespaceManager(xe), true);
                            } 
                        } 
                        else if (decl.ContentValidator.ContentType != XmlSchemaContentType.Mixed || !decl.ContentValidator.IsEmptiable) {
                            throw new XmlSchemaException(Res.Sch_ElementCannotHaveValue, xe); 
                        }
                    }
                }
                if (xe.HasConstraints) { 
                    XmlSchemaObjectCollection constraints = xe.Constraints;
                    CompiledIdentityConstraint[] compiledConstraints = new CompiledIdentityConstraint[constraints.Count]; 
                    int idx = 0; 
                    foreach(XmlSchemaIdentityConstraint constraint in constraints) {
                        CompileIdentityConstraint (constraint); 
                        compiledConstraints[idx ++] = constraint.CompiledConstraint;
                    }
                    decl.Constraints = compiledConstraints;
                } 
                decl.SchemaElement = xe; //So this is available for PSVI
                xe.ElementDecl = decl; 
            } 
            catch (XmlSchemaException e) {
                if (e.SourceSchemaObject == null) { 
                    e.SetSource(xe);
                }
                SendValidationEvent(e);
                xe.ElementDecl = SchemaElementDecl.Empty; 
            }
            finally { 
                xe.IsProcessing = false; 
            }
        } 

        private ContentValidator CompileComplexContent(XmlSchemaComplexType complexType) {
            if (complexType.ContentType == XmlSchemaContentType.Empty) {
                return ContentValidator.Empty; 
            }
            else if (complexType.ContentType == XmlSchemaContentType.TextOnly) { 
                return ContentValidator.TextOnly; 
            }
            XmlSchemaParticle particle = complexType.ContentTypeParticle; 
            if (particle == null || particle == XmlSchemaParticle.Empty) {
                if (complexType.ContentType == XmlSchemaContentType.ElementOnly) {
                    return ContentValidator.Empty;
                } 
                else {
                    return ContentValidator.Mixed; 
                } 
            }
            PushComplexType(complexType); 
            if (particle is XmlSchemaAll) {
                XmlSchemaAll all = (XmlSchemaAll)particle;
                AllElementsContentValidator contentValidator = new AllElementsContentValidator(complexType.ContentType, all.Items.Count, all.MinOccurs == decimal.Zero);
                foreach (XmlSchemaElement localElement in all.Items) { 
                    if (!contentValidator.AddElement(localElement.QualifiedName, localElement, localElement.MinOccurs == decimal.Zero)) {
                       SendValidationEvent(Res.Sch_DupElement, localElement.QualifiedName.ToString(), localElement); 
                    } 
                }
                return contentValidator; 
            }
            else {
                ParticleContentValidator contentValidator = new ParticleContentValidator(complexType.ContentType);
#if DEBUG 
                string name = complexType.Name != null ? complexType.Name : string.Empty;
                Debug.WriteLineIf(DiagnosticsSwitches.XmlSchema.TraceVerbose, "CompileComplexContent: "+ name  + DumpContentModel(particle)); 
#endif 
                try {
                    contentValidator.Start(); 
                    BuildParticleContentModel(contentValidator, particle);
                    return contentValidator.Finish(compileContentModel);
                }
                catch(UpaException e) { 
                    if (e.Particle1 is XmlSchemaElement) {
                        if (e.Particle2 is XmlSchemaElement) { 
                            SendValidationEvent(Res.Sch_NonDeterministic, ((XmlSchemaElement)e.Particle1).QualifiedName.ToString(), (XmlSchemaElement)e.Particle2); 
                        }
                        else { 
                            SendValidationEvent(Res.Sch_NonDeterministicAnyEx, ((XmlSchemaAny)e.Particle2).NamespaceList.ToString(), ((XmlSchemaElement)e.Particle1).QualifiedName.ToString(), (XmlSchemaAny)e.Particle2);
                        }
                    }
                    else { 
                        if (e.Particle2 is XmlSchemaElement) {
                            SendValidationEvent(Res.Sch_NonDeterministicAnyEx, ((XmlSchemaAny)e.Particle1).NamespaceList.ToString(), ((XmlSchemaElement)e.Particle2).QualifiedName.ToString(), (XmlSchemaAny)e.Particle1); 
                        } 
                        else {
                            SendValidationEvent(Res.Sch_NonDeterministicAnyAny, ((XmlSchemaAny)e.Particle1).NamespaceList.ToString(), ((XmlSchemaAny)e.Particle2).NamespaceList.ToString() ,(XmlSchemaAny)e.Particle1); 
                        }
                    }
                    return XmlSchemaComplexType.AnyTypeContentValidator;
                } 
                catch(NotSupportedException) {
                    SendValidationEvent(Res.Sch_ComplexContentModel, complexType, XmlSeverityType.Warning); 
                    return XmlSchemaComplexType.AnyTypeContentValidator; 
                }
            } 
        }

#if DEBUG
        private string DumpContentModel(XmlSchemaParticle particle) { 
            StringBuilder sb = new StringBuilder();
            DumpContentModelTo(sb, particle); 
            return sb.ToString(); 
        }
 
        private void DumpContentModelTo(StringBuilder sb, XmlSchemaParticle particle) {
            if (particle is XmlSchemaElement) {
                sb.Append(((XmlSchemaElement)particle).QualifiedName);
            } 
            else if (particle is XmlSchemaAny) {
                sb.Append("<"); 
                sb.Append(((XmlSchemaAny)particle).NamespaceList.ToString()); 
                sb.Append(">");
            } 
            else if (particle is XmlSchemaAll) {
                XmlSchemaAll all = (XmlSchemaAll)particle;
                sb.Append("[");
                bool first = true; 
                foreach (XmlSchemaElement localElement in all.Items) {
                    if (first) { 
                        first = false; 
                    }
                    else { 
                        sb.Append(", ");
                    }
                    sb.Append(localElement.QualifiedName.Name);
                    if (localElement.MinOccurs == decimal.Zero) { 
                        sb.Append("?");
                    } 
                } 
                sb.Append("]");
            } 
            else if (particle is XmlSchemaGroupBase) {
                XmlSchemaGroupBase gb = (XmlSchemaGroupBase)particle;
                sb.Append("(");
                string delimeter = (particle is XmlSchemaChoice) ? " | " : ", "; 
                bool first = true;
                foreach (XmlSchemaParticle p in gb.Items) { 
                    if (first) { 
                        first = false;
                    } 
                    else {
                        sb.Append(delimeter);
                    }
                    DumpContentModelTo(sb, p); 
                }
                sb.Append(")"); 
            } else { 
                Debug.Assert(particle == XmlSchemaParticle.Empty);
                sb.Append("<>"); 
            }
            if (particle.MinOccurs == decimal.One && particle.MaxOccurs == decimal.One) {
                // nothing
            } 
            else if (particle.MinOccurs == decimal.Zero && particle.MaxOccurs == decimal.One) {
                sb.Append("?"); 
            } 
            else if (particle.MinOccurs == decimal.Zero && particle.MaxOccurs == decimal.MaxValue) {
                sb.Append("*"); 
            }
            else if (particle.MinOccurs == decimal.One && particle.MaxOccurs == decimal.MaxValue) {
                sb.Append("+");
            } 
            else {
                sb.Append("{" + particle.MinOccurs.ToString(NumberFormatInfo.InvariantInfo) +", " + particle.MaxOccurs.ToString(NumberFormatInfo.InvariantInfo) + "}"); 
            } 
        }
#endif 

        private void BuildParticleContentModel(ParticleContentValidator contentValidator, XmlSchemaParticle particle) {
            if (particle is XmlSchemaElement) {
                XmlSchemaElement element = (XmlSchemaElement)particle; 
                contentValidator.AddName(element.QualifiedName, element);
            } 
            else if (particle is XmlSchemaAny) { 
                XmlSchemaAny any = (XmlSchemaAny)particle;
                contentValidator.AddNamespaceList(any.NamespaceList, any); 
            }
            else if (particle is XmlSchemaGroupBase) {
                XmlSchemaObjectCollection particles = ((XmlSchemaGroupBase)particle).Items;
                bool isChoice = particle is XmlSchemaChoice; 
                contentValidator.OpenGroup();
                bool first = true; 
                foreach (XmlSchemaParticle p in particles) { 
                    Debug.Assert(!p.IsEmpty);
                    if (first) { 
                        first = false;
                    }
                    else if (isChoice) {
                        contentValidator.AddChoice(); 
                    }
                    else { 
                        contentValidator.AddSequence(); 
                    }
                    BuildParticleContentModel(contentValidator, p); 
                }
                contentValidator.CloseGroup();
            }
            else { 
                Debug.Assert(false);
            } 
            if (particle.MinOccurs == decimal.One && particle.MaxOccurs == decimal.One) { 
                // nothing
            } 
            else if (particle.MinOccurs == decimal.Zero && particle.MaxOccurs == decimal.One) {
                contentValidator.AddQMark();
            }
            else if (particle.MinOccurs == decimal.Zero && particle.MaxOccurs == decimal.MaxValue) { 
                contentValidator.AddStar();
            } 
            else if (particle.MinOccurs == decimal.One && particle.MaxOccurs == decimal.MaxValue) { 
                contentValidator.AddPlus();
            } 
            else {
                contentValidator.AddLeafRange(particle.MinOccurs, particle.MaxOccurs);
            }
        } 

        private void CompileParticleElements(XmlSchemaComplexType complexType, XmlSchemaParticle particle) { 
            if (particle is XmlSchemaElement) { 
                XmlSchemaElement localElement = (XmlSchemaElement)particle;
                CompileElement(localElement); 
                if (complexType.LocalElements[localElement.QualifiedName] == null) {
                    complexType.LocalElements.Add(localElement.QualifiedName, localElement);
                }
                else { 
                    XmlSchemaElement element = (XmlSchemaElement)complexType.LocalElements[localElement.QualifiedName];
                    if (element.ElementSchemaType != localElement.ElementSchemaType) { 
                        SendValidationEvent(Res.Sch_ElementTypeCollision, particle); 
                    }
                } 
            }
            else if (particle is XmlSchemaGroupBase) {
                XmlSchemaObjectCollection particles = ((XmlSchemaGroupBase)particle).Items;
                foreach (XmlSchemaParticle p in particles) { 
                    CompileParticleElements(complexType, p);
                } 
            } 
        }
 
        private void CompileCompexTypeElements(XmlSchemaComplexType complexType) {
            if (complexType.IsProcessing) {
                SendValidationEvent(Res.Sch_TypeCircularRef, complexType);
                return; 
            }
            complexType.IsProcessing = true; 
            if (complexType.ContentTypeParticle != XmlSchemaParticle.Empty) { 
                CompileParticleElements(complexType, complexType.ContentTypeParticle);
            } 
            complexType.IsProcessing = false;
        }

        private XmlSchemaSimpleType GetSimpleType(XmlQualifiedName name) { 
            XmlSchemaSimpleType type = this.schema.SchemaTypes[name] as XmlSchemaSimpleType;
            if (type != null) { 
                CompileSimpleType(type); 
            }
            else { 
                type = DatatypeImplementation.GetSimpleTypeFromXsdType(name);
                //Re-assign datatype impl for V1Compat
                if (type != null) {
                    if (type.TypeCode == XmlTypeCode.NormalizedString) { 
                        type = DatatypeImplementation.GetNormalizedStringTypeV1Compat();
                    } 
                    else if (type.TypeCode == XmlTypeCode.Token) { 
                        type = DatatypeImplementation.GetTokenTypeV1Compat();
                    } 
                }
            }
            return type;
        } 

        private XmlSchemaComplexType GetComplexType(XmlQualifiedName name) { 
            XmlSchemaComplexType type = this.schema.SchemaTypes[name] as XmlSchemaComplexType; 
            if (type != null) {
                CompileComplexType(type); 
            }
            return type;
        }
 
         private XmlSchemaType GetAnySchemaType(XmlQualifiedName name) {
                XmlSchemaType type = (XmlSchemaType)this.schema.SchemaTypes[name]; 
                if (type != null) { 
                    if (type is XmlSchemaComplexType) {
                        CompileComplexType((XmlSchemaComplexType)type); 
                    }
                    else {
                        CompileSimpleType((XmlSchemaSimpleType)type);
                    } 
                    return type;
                } 
                else { //Its is a built-in simpleType 
                    XmlSchemaSimpleType simpleType = DatatypeImplementation.GetSimpleTypeFromXsdType(name);
                    return simpleType; 
                }
        }
    };
 
} // namespace System.Xml

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

Link Menu

Network programming in C#, Network Programming in VB.NET, Network Programming in .NET
This book is available now!
Buy at Amazon US or
Buy at Amazon UK