// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.

using System;
using System.Xml;
using System.Xml.XPath;
using System.Globalization;
using System.Diagnostics;
using System.Collections;
using System.Collections.Generic;
using System.Xml.Schema;
using System.IO;
using System.Text;
using System.Runtime.InteropServices;
using System.Reflection;

namespace System.Xml.Schema
{
    //
    // NOTE!!! LARGE PORTIONS OF THIS FILE ARE AUTOGENERATED BY GENERATECONVERTER.CS.  DO NOT MANUALLY CHANGE ANY CODE
    //         WITHIN #REGION.  INSTEAD, MODIFY GENERATECONVERTER.CS.
    //

    // SUMMARY
    // =======
    // For each Xml type, there is a set of Clr types that can represent it.  Some of these mappings involve
    // loss of fidelity.  For example, xsd:dateTime can be represented as System.DateTime, but only at the expense
    // of normalizing the time zone.  And xs:duration can be represented as System.TimeSpan, but only at the expense
    // of discarding variations such as "P50H", "P1D26H", "P2D2H", all of which are normalized as "P2D2H".
    //
    // Implementations of this class convert between the various Clr representations of Xml types.  Note that
    // in *no* case is the Xml type ever modified.  Only the Clr type is changed.  This means that in cases where
    // the Xml type is part of the representation (such as XmlAtomicValue), the destination value is guaranteed
    // to have the same Xml type.
    //
    // For all converters, converting to typeof(object) is identical to converting to XmlSchemaType.Datatype.ValueType.
    //
    //
    // ATOMIC MAPPINGS
    // ===============
    //
    // -----------------------------------------------------------------------------------------------------------
    // Source/Destination   System.String                       Other Clr Type
    // -----------------------------------------------------------------------------------------------------------
    // System.String        No-op conversion.                   Use Xsd rules to convert from the string
    //                                                          to primitive, full-fidelity Clr type (use
    //                                                          XmlConvert where possible).  Use Clr rules
    //                                                          to convert to destination type.
    // -----------------------------------------------------------------------------------------------------------
    // Other Clr Type       Use Clr rules to convert from       Use Clr rules to convert from source to
    //                      source type to primitive, full-     destination type.
    //                      fidelity Clr type.  Use Xsd rules
    //                      to convert to a string (use
    //                      XmlConvert where possible).         
    // -----------------------------------------------------------------------------------------------------------
    //
    //
    // LIST MAPPINGS
    // =============
    // The following Clr types can be used to represent Xsd list types: IList, ICollection, IEnumerable, Type[],
    // String.
    //
    // -----------------------------------------------------------------------------------------------------------
    // Source/Destination   System.String                           Clr List Type
    // -----------------------------------------------------------------------------------------------------------
    // System.String        No-op conversion                        Tokenize the string by whitespace, create a
    //                                                              String[] from tokens, and follow List => List 
    //                                                              rules.
    // -----------------------------------------------------------------------------------------------------------
    // Clr List Type        Follow List => String[] rules,          Create destination list having the same length
    //                      then concatenate strings from array,    as the source list.  For each item in the
    //                      separating adjacent strings with a      source list, call the atomic converter to
    //                      single space character.                 convert to the destination type.  The destination
    //                                                              item type for IList, ICollection, IEnumerable
    //                                                              is typeof(object).  The destination item type
    //                                                              for Type[] is Type.
    // -----------------------------------------------------------------------------------------------------------
    //
    //
    // UNION MAPPINGS
    // ==============
    // Union types may only be represented using System.Xml.Schema.XmlAtomicValue or System.String.  Either the
    // source type or the destination type must therefore always be either System.String or
    // System.Xml.Schema.XmlAtomicValue.
    //
    // -----------------------------------------------------------------------------------------------------------
    // Source/Destination   System.String           XmlAtomicValue          Other Clr Type
    // -----------------------------------------------------------------------------------------------------------
    // System.String        No-op conversion        Follow System.String=>  Call ParseValue in order to determine
    //                                              Other Clr Type rules.   the member type.  Call ChangeType on
    //                                                                      the member type's converter to convert
    //                                                                      to desired Clr type.
    // -----------------------------------------------------------------------------------------------------------
    // XmlAtomicValue       Follow XmlAtomicValue   No-op conversion.       Call ReadValueAs, where destinationType
    //                      => Other Clr Type                               is the desired Clr type.
    //                      rules.
    // -----------------------------------------------------------------------------------------------------------
    // Other Clr Type       InvalidCastException   InvalidCastException     InvalidCastException
    // -----------------------------------------------------------------------------------------------------------
    //
    //
    // EXAMPLES
    // ========
    //
    // -----------------------------------------------------------------------------------------------------------
    //            Source    Destination
    // Xml Type   Value     Type             Conversion Steps                  Explanation
    // -----------------------------------------------------------------------------------------------------------
    // xs:int     "10"      Byte             "10" => 10M => (byte) 10          Primitive, full-fidelity for xs:int
    //                                                                         is a truncated decimal
    // -----------------------------------------------------------------------------------------------------------
    // xs:int     "10.10"   Byte             FormatException                   xs:integer parsing rules do not
    //                                                                         allow fractional parts
    // -----------------------------------------------------------------------------------------------------------
    // xs:int     10.10M    Byte             10.10M => (byte) 10               Default Clr rules truncate when
    //                                                                         converting from Decimal to Byte
    // -----------------------------------------------------------------------------------------------------------
    // xs:int     10.10M    Decimal          10.10M => 10.10M                  Decimal => Decimal is no-op
    // -----------------------------------------------------------------------------------------------------------
    // xs:int     10.10M    String           10.10M => 10M => "10"
    // -----------------------------------------------------------------------------------------------------------
    // xs:int     "hello"   String           "hello" => "hello"                String => String is no-op
    // -----------------------------------------------------------------------------------------------------------
    // xs:byte    "300"     Int32            "300" => 300M => (int) 300
    // -----------------------------------------------------------------------------------------------------------
    // xs:byte    300       Byte             300 => 300M => OverflowException  Clr overflows when converting from
    //                                                                         Decimal to Byte
    // -----------------------------------------------------------------------------------------------------------
    // xs:byte    300       XmlAtomicValue   new XmlAtomicValue(xs:byte, 300)  Invalid atomic value created
    // -----------------------------------------------------------------------------------------------------------
    // xs:double  1.234f    String          1.234f => 1.2339999675750732d =>   Converting a Single value to a Double
    //                                      "1.2339999675750732"               value zero-extends it in base-2, so
    //                                                                         "garbage" digits appear when it's
    //                                                                         converted to base-10.
    // -----------------------------------------------------------------------------------------------------------
    // xs:int*    {1, "2",  String          {1, "2", 3.1M} =>                  Delegate to xs:int converter to
    //            3.1M}                     {"1", "2", "3"} => "1 2 3"         convert each item to a string.
    // -----------------------------------------------------------------------------------------------------------
    // xs:int*    "1 2 3"   Int32[]         "1 2 3" => {"1", "2", "3"} =>
    //                                      {1, 2, 3}
    // -----------------------------------------------------------------------------------------------------------
    // xs:int*    {1, "2",  Object[]        {1, "2", 3.1M} =>                  xs:int converter uses Int32 by default,
    //            3.1M}                     {(object)1, (object)2, (object)3}  so returns boxed Int32 values.
    // -----------------------------------------------------------------------------------------------------------
    // (xs:int |  "1 2001"  XmlAtomicValue[]  "1 2001" => {(xs:int) 1,
    // xs:gYear)*                             (xs:gYear) 2001}
    // -----------------------------------------------------------------------------------------------------------
    // (xs:int* | "1 2001"  String          "1 2001"                           No-op conversion even though
    // xs:gYear*)                                                              ParseValue would fail if it were called.
    // -----------------------------------------------------------------------------------------------------------
    // (xs:int* | "1 2001"  Int[]           XmlSchemaException                 ParseValue fails.
    // xs:gYear*)
    // -----------------------------------------------------------------------------------------------------------
    //
    internal abstract class XmlValueConverter
    {
        public abstract bool ToBoolean(long value);
        public abstract bool ToBoolean(int value);
        public abstract bool ToBoolean(double value);
        public abstract bool ToBoolean(DateTime value);
        public abstract bool ToBoolean(string value);
        public abstract bool ToBoolean(object value);

        public abstract int ToInt32(bool value);
        public abstract int ToInt32(long value);
        public abstract int ToInt32(double value);
        public abstract int ToInt32(DateTime value);
        public abstract int ToInt32(string value);
        public abstract int ToInt32(object value);

        public abstract long ToInt64(bool value);
        public abstract long ToInt64(int value);
        public abstract long ToInt64(double value);
        public abstract long ToInt64(DateTime value);
        public abstract long ToInt64(string value);
        public abstract long ToInt64(object value);
        public abstract decimal ToDecimal(string value);
        public abstract decimal ToDecimal(object value);

        public abstract double ToDouble(bool value);
        public abstract double ToDouble(int value);
        public abstract double ToDouble(long value);
        public abstract double ToDouble(DateTime value);
        public abstract double ToDouble(string value);
        public abstract double ToDouble(object value);
        public abstract float ToSingle(double value);
        public abstract float ToSingle(string value);
        public abstract float ToSingle(object value);

        public abstract DateTime ToDateTime(bool value);
        public abstract DateTime ToDateTime(int value);
        public abstract DateTime ToDateTime(long value);
        public abstract DateTime ToDateTime(double value);
        public abstract DateTime ToDateTime(DateTimeOffset value);
        public abstract DateTime ToDateTime(string value);
        public abstract DateTime ToDateTime(object value);
        public abstract DateTimeOffset ToDateTimeOffset(DateTime value);
        public abstract DateTimeOffset ToDateTimeOffset(string value);
        public abstract DateTimeOffset ToDateTimeOffset(object value);

        public abstract string ToString(bool value);
        public abstract string ToString(int value);
        public abstract string ToString(long value);
        public abstract string ToString(decimal value);
        public abstract string ToString(float value);
        public abstract string ToString(double value);
        public abstract string ToString(DateTime value);
        public abstract string ToString(DateTimeOffset value);
        public abstract string ToString(object value);
        public abstract string ToString(object value, IXmlNamespaceResolver nsResolver);

        public abstract object ChangeType(bool value, Type destinationType);
        public abstract object ChangeType(int value, Type destinationType);
        public abstract object ChangeType(long value, Type destinationType);
        public abstract object ChangeType(decimal value, Type destinationType);
        public abstract object ChangeType(double value, Type destinationType);
        public abstract object ChangeType(DateTime value, Type destinationType);
        public abstract object ChangeType(string value, Type destinationType, IXmlNamespaceResolver nsResolver);
        public abstract object ChangeType(object value, Type destinationType);
        public abstract object ChangeType(object value, Type destinationType, IXmlNamespaceResolver nsResolver);
    }

    internal abstract class XmlBaseConverter : XmlValueConverter
    {
        private XmlSchemaType _schemaType;
        private XmlTypeCode _typeCode;
        private Type _clrTypeDefault;

        protected XmlBaseConverter(XmlSchemaType schemaType)
        {
            // XmlValueConverter is defined only on types with simple content
            XmlSchemaDatatype datatype = schemaType.Datatype;
            Debug.Assert(schemaType != null && datatype != null, "schemaType or schemaType.Datatype may not be null");

            while (schemaType != null && !(schemaType is XmlSchemaSimpleType))
            {
                schemaType = schemaType.BaseXmlSchemaType;
            }
            if (schemaType == null)
            { //Did not find any simple type in the parent chain
                schemaType = XmlSchemaType.GetBuiltInSimpleType(datatype.TypeCode);
            }
            Debug.Assert(schemaType.Datatype.Variety != XmlSchemaDatatypeVariety.List, "schemaType must be list's item type, not list itself");

            _schemaType = schemaType;
            _typeCode = schemaType.TypeCode;
            _clrTypeDefault = schemaType.Datatype.ValueType;
        }

        protected XmlBaseConverter(XmlTypeCode typeCode)
        {
            switch (typeCode)
            {
                case XmlTypeCode.Item:
                    _clrTypeDefault = XPathItemType;
                    break;

                case XmlTypeCode.Node:
                    _clrTypeDefault = XPathNavigatorType;
                    break;

                case XmlTypeCode.AnyAtomicType:
                    _clrTypeDefault = XmlAtomicValueType;
                    break;

                default:
                    Debug.Fail("Type code " + typeCode + " is not supported.");
                    break;
            }

            _typeCode = typeCode;
        }

        protected XmlBaseConverter(XmlBaseConverter converterAtomic)
        {
            _schemaType = converterAtomic._schemaType;
            _typeCode = converterAtomic._typeCode;
            _clrTypeDefault = Array.CreateInstance(converterAtomic.DefaultClrType, 0).GetType();
        }

        protected XmlBaseConverter(XmlBaseConverter converterAtomic, Type clrTypeDefault)
        {
            _schemaType = converterAtomic._schemaType;
            _typeCode = converterAtomic._typeCode;
            _clrTypeDefault = clrTypeDefault;
        }

        protected static readonly Type ICollectionType = typeof(ICollection);
        protected static readonly Type IEnumerableType = typeof(IEnumerable);
        protected static readonly Type IListType = typeof(IList);
        protected static readonly Type ObjectArrayType = typeof(object[]);
        protected static readonly Type StringArrayType = typeof(string[]);
        protected static readonly Type XmlAtomicValueArrayType = typeof(XmlAtomicValue[]);

        #region AUTOGENERATED_XMLBASECONVERTER
        protected static readonly Type DecimalType = typeof(decimal);
        protected static readonly Type Int32Type = typeof(int);
        protected static readonly Type Int64Type = typeof(long);
        protected static readonly Type StringType = typeof(string);
        protected static readonly Type XmlAtomicValueType = typeof(XmlAtomicValue);
        protected static readonly Type ObjectType = typeof(object);
        protected static readonly Type ByteType = typeof(byte);
        protected static readonly Type Int16Type = typeof(short);
        protected static readonly Type SByteType = typeof(sbyte);
        protected static readonly Type UInt16Type = typeof(ushort);
        protected static readonly Type UInt32Type = typeof(uint);
        protected static readonly Type UInt64Type = typeof(ulong);
        protected static readonly Type XPathItemType = typeof(XPathItem);
        protected static readonly Type DoubleType = typeof(double);
        protected static readonly Type SingleType = typeof(float);
        protected static readonly Type DateTimeType = typeof(DateTime);
        protected static readonly Type DateTimeOffsetType = typeof(DateTimeOffset);
        protected static readonly Type BooleanType = typeof(bool);
        protected static readonly Type ByteArrayType = typeof(byte[]);
        protected static readonly Type XmlQualifiedNameType = typeof(XmlQualifiedName);
        protected static readonly Type UriType = typeof(Uri);
        protected static readonly Type TimeSpanType = typeof(TimeSpan);
        protected static readonly Type XPathNavigatorType = typeof(XPathNavigator);
        public override bool ToBoolean(DateTime value) { return (bool)ChangeType((object)value, BooleanType, null); }
        public override bool ToBoolean(double value) { return (bool)ChangeType((object)value, BooleanType, null); }
        public override bool ToBoolean(int value) { return (bool)ChangeType((object)value, BooleanType, null); }
        public override bool ToBoolean(long value) { return (bool)ChangeType((object)value, BooleanType, null); }
        public override bool ToBoolean(string value) { return (bool)ChangeType((object)value, BooleanType, null); }
        public override bool ToBoolean(object value) { return (bool)ChangeType((object)value, BooleanType, null); }

        public override DateTime ToDateTime(bool value) { return (DateTime)ChangeType((object)value, DateTimeType, null); }
        public override DateTime ToDateTime(DateTimeOffset value) { return (DateTime)ChangeType((object)value, DateTimeType, null); }
        public override DateTime ToDateTime(double value) { return (DateTime)ChangeType((object)value, DateTimeType, null); }
        public override DateTime ToDateTime(int value) { return (DateTime)ChangeType((object)value, DateTimeType, null); }
        public override DateTime ToDateTime(long value) { return (DateTime)ChangeType((object)value, DateTimeType, null); }
        public override DateTime ToDateTime(string value) { return (DateTime)ChangeType((object)value, DateTimeType, null); }
        public override DateTime ToDateTime(object value) { return (DateTime)ChangeType((object)value, DateTimeType, null); }
        public override DateTimeOffset ToDateTimeOffset(DateTime value) { return (DateTimeOffset)ChangeType((object)value, DateTimeOffsetType, null); }
        public override DateTimeOffset ToDateTimeOffset(string value) { return (DateTimeOffset)ChangeType((object)value, DateTimeOffsetType, null); }
        public override DateTimeOffset ToDateTimeOffset(object value) { return (DateTimeOffset)ChangeType((object)value, DateTimeOffsetType, null); }
        public override decimal ToDecimal(string value) { return (decimal)ChangeType((object)value, DecimalType, null); }
        public override decimal ToDecimal(object value) { return (decimal)ChangeType((object)value, DecimalType, null); }

        public override double ToDouble(bool value) { return (double)ChangeType((object)value, DoubleType, null); }
        public override double ToDouble(DateTime value) { return (double)ChangeType((object)value, DoubleType, null); }
        public override double ToDouble(int value) { return (double)ChangeType((object)value, DoubleType, null); }
        public override double ToDouble(long value) { return (double)ChangeType((object)value, DoubleType, null); }
        public override double ToDouble(string value) { return (double)ChangeType((object)value, DoubleType, null); }
        public override double ToDouble(object value) { return (double)ChangeType((object)value, DoubleType, null); }

        public override int ToInt32(bool value) { return (int)ChangeType((object)value, Int32Type, null); }
        public override int ToInt32(DateTime value) { return (int)ChangeType((object)value, Int32Type, null); }
        public override int ToInt32(double value) { return (int)ChangeType((object)value, Int32Type, null); }
        public override int ToInt32(long value) { return (int)ChangeType((object)value, Int32Type, null); }
        public override int ToInt32(string value) { return (int)ChangeType((object)value, Int32Type, null); }
        public override int ToInt32(object value) { return (int)ChangeType((object)value, Int32Type, null); }

        public override long ToInt64(bool value) { return (long)ChangeType((object)value, Int64Type, null); }
        public override long ToInt64(DateTime value) { return (long)ChangeType((object)value, Int64Type, null); }
        public override long ToInt64(double value) { return (long)ChangeType((object)value, Int64Type, null); }
        public override long ToInt64(int value) { return (long)ChangeType((object)value, Int64Type, null); }
        public override long ToInt64(string value) { return (long)ChangeType((object)value, Int64Type, null); }
        public override long ToInt64(object value) { return (long)ChangeType((object)value, Int64Type, null); }
        public override float ToSingle(double value) { return (float)ChangeType((object)value, SingleType, null); }
        public override float ToSingle(string value) { return (float)ChangeType((object)value, SingleType, null); }
        public override float ToSingle(object value) { return (float)ChangeType((object)value, SingleType, null); }

        public override string ToString(bool value) { return (string)ChangeType((object)value, StringType, null); }
        public override string ToString(DateTime value) { return (string)ChangeType((object)value, StringType, null); }
        public override string ToString(DateTimeOffset value) { return (string)ChangeType((object)value, StringType, null); }
        public override string ToString(decimal value) { return (string)ChangeType((object)value, StringType, null); }
        public override string ToString(double value) { return (string)ChangeType((object)value, StringType, null); }
        public override string ToString(int value) { return (string)ChangeType((object)value, StringType, null); }
        public override string ToString(long value) { return (string)ChangeType((object)value, StringType, null); }
        public override string ToString(float value) { return (string)ChangeType((object)value, StringType, null); }
        public override string ToString(object value, IXmlNamespaceResolver nsResolver) { return (string)ChangeType((object)value, StringType, nsResolver); }
        public override string ToString(object value) { return this.ToString(value, null); }

        public override object ChangeType(bool value, Type destinationType) { return (object)ChangeType((object)value, destinationType, null); }
        public override object ChangeType(DateTime value, Type destinationType) { return (object)ChangeType((object)value, destinationType, null); }
        public override object ChangeType(decimal value, Type destinationType) { return (object)ChangeType((object)value, destinationType, null); }
        public override object ChangeType(double value, Type destinationType) { return (object)ChangeType((object)value, destinationType, null); }
        public override object ChangeType(int value, Type destinationType) { return (object)ChangeType((object)value, destinationType, null); }
        public override object ChangeType(long value, Type destinationType) { return (object)ChangeType((object)value, destinationType, null); }
        public override object ChangeType(string value, Type destinationType, IXmlNamespaceResolver nsResolver) { return (object)ChangeType((object)value, destinationType, nsResolver); }
        public override object ChangeType(object value, Type destinationType) { return this.ChangeType(value, destinationType, null); }

        #endregion

        /// <summary>
        /// Return this converter's prime schema type (may be null in case of Node, Item, etc).
        /// </summary>
        protected XmlSchemaType SchemaType
        {
            get { return _schemaType; }
        }

        /// <summary>
        /// Return the XmlTypeCode of this converter's prime schema type.
        /// </summary>
        protected XmlTypeCode TypeCode
        {
            get { return _typeCode; }
        }

        /// <summary>
        /// Return a string representation of this converter's prime schema type.
        /// </summary>
        protected string XmlTypeName
        {
            get
            {
                XmlSchemaType type = _schemaType;

                if (type != null)
                {
                    while (type.QualifiedName.IsEmpty)
                    {
                        // Walk base classes until one with a name is found (in worst case, all simple types derive from xs:anySimpleType)
                        type = type.BaseXmlSchemaType;
                    }

                    return QNameToString(type.QualifiedName);
                }

                // SchemaType is null in the case of item, node, and xdt:anyAtomicType
                if (_typeCode == XmlTypeCode.Node) return "node";
                if (_typeCode == XmlTypeCode.AnyAtomicType) return "xdt:anyAtomicType";

                Debug.Assert(_typeCode == XmlTypeCode.Item, "If SchemaType is null, then TypeCode may only be Item, Node, or AnyAtomicType");
                return "item";
            }
        }

        /// <summary>
        /// Return default V1 Clr mapping of this converter's type.
        /// </summary>
        protected Type DefaultClrType
        {
            get { return _clrTypeDefault; }
        }

        /// <summary>
        /// Type.IsSubtypeOf does not return true if types are equal, this method does.
        /// </summary>
        protected static bool IsDerivedFrom(Type derivedType, Type baseType)
        {
            while (derivedType != null)
            {
                if (derivedType == baseType)
                    return true;

                derivedType = derivedType.BaseType;
            }
            return false;
        }

        /// <summary>
        /// Create an InvalidCastException for cases where either "destinationType" or "sourceType" is not a supported CLR representation
        /// for this Xml type.
        /// </summary>
        protected Exception CreateInvalidClrMappingException(Type sourceType, Type destinationType)
        {
            if (sourceType == destinationType)
                return new InvalidCastException(SR.Format(SR.XmlConvert_TypeBadMapping, XmlTypeName, sourceType.Name));

            return new InvalidCastException(SR.Format(SR.XmlConvert_TypeBadMapping2, XmlTypeName, sourceType.Name, destinationType.Name));
        }

        /// <summary>
        /// Convert an XmlQualifiedName to a string, using somewhat different rules than XmlQualifiedName.ToString():
        ///   1. Recognize the built-in xs: and xdt: namespaces and print the short prefix rather than the long namespace
        ///   2. Use brace characters "{", "}" around the namespace portion of the QName
        /// </summary>
        protected static string QNameToString(XmlQualifiedName name)
        {
            if (name.Namespace.Length == 0)
            {
                return name.Name;
            }
            else if (name.Namespace == XmlReservedNs.NsXs)
            {
                return "xs:" + name.Name;
            }
            else if (name.Namespace == XmlReservedNs.NsXQueryDataType)
            {
                return "xdt:" + name.Name;
            }
            else
            {
                return "{" + name.Namespace + "}" + name.Name;
            }
        }

        /// <summary>
        /// This method is called when a valid conversion cannot be found.  By default, this method throws an error.  It can
        /// be overridden in derived classes to support list conversions.
        /// </summary>
        protected virtual object ChangeListType(object value, Type destinationType, IXmlNamespaceResolver nsResolver)
        {
            throw CreateInvalidClrMappingException(value.GetType(), destinationType);
        }


        //------------------------------------------------------------------------
        // From String Conversion Helpers
        //------------------------------------------------------------------------

        protected static byte[] StringToBase64Binary(string value)
        {
            return Convert.FromBase64String(XmlConvert.TrimString(value));
        }

        protected static DateTime StringToDate(string value)
        {
            return (DateTime)(new XsdDateTime(value, XsdDateTimeFlags.Date));
        }

        protected static DateTime StringToDateTime(string value)
        {
            return (DateTime)(new XsdDateTime(value, XsdDateTimeFlags.DateTime));
        }

        protected static TimeSpan StringToDayTimeDuration(string value)
        {
            // Parse string as DayTimeDuration and convert it to a DayTimeDuration TimeSpan (it is an error to have year and month parts)
            return new XsdDuration(value, XsdDuration.DurationType.DayTimeDuration).ToTimeSpan(XsdDuration.DurationType.DayTimeDuration);
        }

        protected static TimeSpan StringToDuration(string value)
        {
            return new XsdDuration(value, XsdDuration.DurationType.Duration).ToTimeSpan(XsdDuration.DurationType.Duration);
        }

        protected static DateTime StringToGDay(string value)
        {
            return (DateTime)(new XsdDateTime(value, XsdDateTimeFlags.GDay));
        }

        protected static DateTime StringToGMonth(string value)
        {
            return (DateTime)(new XsdDateTime(value, XsdDateTimeFlags.GMonth));
        }

        protected static DateTime StringToGMonthDay(string value)
        {
            return (DateTime)(new XsdDateTime(value, XsdDateTimeFlags.GMonthDay));
        }

        protected static DateTime StringToGYear(string value)
        {
            return (DateTime)(new XsdDateTime(value, XsdDateTimeFlags.GYear));
        }

        protected static DateTime StringToGYearMonth(string value)
        {
            return (DateTime)(new XsdDateTime(value, XsdDateTimeFlags.GYearMonth));
        }

        protected static DateTimeOffset StringToDateOffset(string value)
        {
            return (DateTimeOffset)(new XsdDateTime(value, XsdDateTimeFlags.Date));
        }

        protected static DateTimeOffset StringToDateTimeOffset(string value)
        {
            return (DateTimeOffset)(new XsdDateTime(value, XsdDateTimeFlags.DateTime));
        }

        protected static DateTimeOffset StringToGDayOffset(string value)
        {
            return (DateTimeOffset)(new XsdDateTime(value, XsdDateTimeFlags.GDay));
        }

        protected static DateTimeOffset StringToGMonthOffset(string value)
        {
            return (DateTimeOffset)(new XsdDateTime(value, XsdDateTimeFlags.GMonth));
        }

        protected static DateTimeOffset StringToGMonthDayOffset(string value)
        {
            return (DateTimeOffset)(new XsdDateTime(value, XsdDateTimeFlags.GMonthDay));
        }

        protected static DateTimeOffset StringToGYearOffset(string value)
        {
            return (DateTimeOffset)(new XsdDateTime(value, XsdDateTimeFlags.GYear));
        }

        protected static DateTimeOffset StringToGYearMonthOffset(string value)
        {
            return (DateTimeOffset)(new XsdDateTime(value, XsdDateTimeFlags.GYearMonth));
        }

        protected static byte[] StringToHexBinary(string value)
        {
            try
            {
                return XmlConvert.FromBinHexString(XmlConvert.TrimString(value), false);
            }
            catch (XmlException e)
            {
                throw new FormatException(e.Message);
            }
        }

        protected static XmlQualifiedName StringToQName(string value, IXmlNamespaceResolver nsResolver)
        {
            string prefix, localName, ns;

            value = value.Trim();

            // Parse prefix:localName
            try
            {
                ValidateNames.ParseQNameThrow(value, out prefix, out localName);
            }
            catch (XmlException e)
            {
                throw new FormatException(e.Message);
            }

            // Throw error if no namespaces are in scope
            if (nsResolver == null)
                throw new InvalidCastException(SR.Format(SR.XmlConvert_TypeNoNamespace, value, prefix));

            // Lookup namespace
            ns = nsResolver.LookupNamespace(prefix);
            if (ns == null)
                throw new InvalidCastException(SR.Format(SR.XmlConvert_TypeNoNamespace, value, prefix));

            // Create XmlQualfiedName
            return new XmlQualifiedName(localName, ns);
        }

        protected static DateTime StringToTime(string value)
        {
            return (DateTime)(new XsdDateTime(value, XsdDateTimeFlags.Time));
        }

        protected static DateTimeOffset StringToTimeOffset(string value)
        {
            return (DateTimeOffset)(new XsdDateTime(value, XsdDateTimeFlags.Time));
        }

        protected static TimeSpan StringToYearMonthDuration(string value)
        {
            // Parse string as YearMonthDuration and convert it to a YearMonthDuration TimeSpan (it is an error to have day and time parts)
            return new XsdDuration(value, XsdDuration.DurationType.YearMonthDuration).ToTimeSpan(XsdDuration.DurationType.YearMonthDuration);
        }


        //------------------------------------------------------------------------
        // To String Conversion Helpers
        //------------------------------------------------------------------------

        protected static string AnyUriToString(Uri value)
        {
            return value.OriginalString;
        }

        protected static string Base64BinaryToString(byte[] value)
        {
            return Convert.ToBase64String(value);
        }

        protected static string DateToString(DateTime value)
        {
            return (new XsdDateTime(value, XsdDateTimeFlags.Date)).ToString();
        }

        protected static string DateTimeToString(DateTime value)
        {
            return (new XsdDateTime(value, XsdDateTimeFlags.DateTime)).ToString();
        }

        protected static string DayTimeDurationToString(TimeSpan value)
        {
            return new XsdDuration(value, XsdDuration.DurationType.DayTimeDuration).ToString(XsdDuration.DurationType.DayTimeDuration);
        }

        protected static string DurationToString(TimeSpan value)
        {
            return new XsdDuration(value, XsdDuration.DurationType.Duration).ToString(XsdDuration.DurationType.Duration);
        }

        protected static string GDayToString(DateTime value)
        {
            return (new XsdDateTime(value, XsdDateTimeFlags.GDay)).ToString();
        }

        protected static string GMonthToString(DateTime value)
        {
            return (new XsdDateTime(value, XsdDateTimeFlags.GMonth)).ToString();
        }

        protected static string GMonthDayToString(DateTime value)
        {
            return (new XsdDateTime(value, XsdDateTimeFlags.GMonthDay)).ToString();
        }

        protected static string GYearToString(DateTime value)
        {
            return (new XsdDateTime(value, XsdDateTimeFlags.GYear)).ToString();
        }

        protected static string GYearMonthToString(DateTime value)
        {
            return (new XsdDateTime(value, XsdDateTimeFlags.GYearMonth)).ToString();
        }

        protected static string DateOffsetToString(DateTimeOffset value)
        {
            return (new XsdDateTime(value, XsdDateTimeFlags.Date)).ToString();
        }

        protected static string DateTimeOffsetToString(DateTimeOffset value)
        {
            return (new XsdDateTime(value, XsdDateTimeFlags.DateTime)).ToString();
        }

        protected static string GDayOffsetToString(DateTimeOffset value)
        {
            return (new XsdDateTime(value, XsdDateTimeFlags.GDay)).ToString();
        }

        protected static string GMonthOffsetToString(DateTimeOffset value)
        {
            return (new XsdDateTime(value, XsdDateTimeFlags.GMonth)).ToString();
        }

        protected static string GMonthDayOffsetToString(DateTimeOffset value)
        {
            return (new XsdDateTime(value, XsdDateTimeFlags.GMonthDay)).ToString();
        }

        protected static string GYearOffsetToString(DateTimeOffset value)
        {
            return (new XsdDateTime(value, XsdDateTimeFlags.GYear)).ToString();
        }

        protected static string GYearMonthOffsetToString(DateTimeOffset value)
        {
            return (new XsdDateTime(value, XsdDateTimeFlags.GYearMonth)).ToString();
        }

        protected static string QNameToString(XmlQualifiedName qname, IXmlNamespaceResolver nsResolver)
        {
            string prefix;

            if (nsResolver == null)
                return string.Concat("{", qname.Namespace, "}", qname.Name);

            prefix = nsResolver.LookupPrefix(qname.Namespace);
            if (prefix == null)
                throw new InvalidCastException(SR.Format(SR.XmlConvert_TypeNoPrefix, qname, qname.Namespace));

            return (prefix.Length != 0) ? string.Concat(prefix, ":", qname.Name) : qname.Name;
        }

        protected static string TimeToString(DateTime value)
        {
            return (new XsdDateTime(value, XsdDateTimeFlags.Time)).ToString();
        }

        protected static string TimeOffsetToString(DateTimeOffset value)
        {
            return (new XsdDateTime(value, XsdDateTimeFlags.Time)).ToString();
        }

        protected static string YearMonthDurationToString(TimeSpan value)
        {
            return new XsdDuration(value, XsdDuration.DurationType.YearMonthDuration).ToString(XsdDuration.DurationType.YearMonthDuration);
        }


        //------------------------------------------------------------------------
        // Other Conversion Helpers
        //------------------------------------------------------------------------

        internal static DateTime DateTimeOffsetToDateTime(DateTimeOffset value)
        {
            return value.LocalDateTime;
        }

        internal static int DecimalToInt32(decimal value)
        {
            if (value < (decimal)int.MinValue || value > (decimal)int.MaxValue)
                throw new OverflowException(SR.Format(SR.XmlConvert_Overflow, new string[] { XmlConvert.ToString(value), "Int32" }));

            return (int)value;
        }

        protected static long DecimalToInt64(decimal value)
        {
            if (value < (decimal)long.MinValue || value > (decimal)long.MaxValue)
                throw new OverflowException(SR.Format(SR.XmlConvert_Overflow, new string[] { XmlConvert.ToString(value), "Int64" }));

            return (long)value;
        }

        protected static ulong DecimalToUInt64(decimal value)
        {
            if (value < (decimal)ulong.MinValue || value > (decimal)ulong.MaxValue)
                throw new OverflowException(SR.Format(SR.XmlConvert_Overflow, new string[] { XmlConvert.ToString(value), "UInt64" }));

            return (ulong)value;
        }

        protected static byte Int32ToByte(int value)
        {
            if (value < (int)byte.MinValue || value > (int)byte.MaxValue)
                throw new OverflowException(SR.Format(SR.XmlConvert_Overflow, new string[] { XmlConvert.ToString(value), "Byte" }));

            return (byte)value;
        }

        protected static short Int32ToInt16(int value)
        {
            if (value < (int)short.MinValue || value > (int)short.MaxValue)
                throw new OverflowException(SR.Format(SR.XmlConvert_Overflow, new string[] { XmlConvert.ToString(value), "Int16" }));

            return (short)value;
        }

        protected static sbyte Int32ToSByte(int value)
        {
            if (value < (int)sbyte.MinValue || value > (int)sbyte.MaxValue)
                throw new OverflowException(SR.Format(SR.XmlConvert_Overflow, new string[] { XmlConvert.ToString(value), "SByte" }));

            return (sbyte)value;
        }

        protected static ushort Int32ToUInt16(int value)
        {
            if (value < (int)ushort.MinValue || value > (int)ushort.MaxValue)
                throw new OverflowException(SR.Format(SR.XmlConvert_Overflow, new string[] { XmlConvert.ToString(value), "UInt16" }));

            return (ushort)value;
        }

        protected static int Int64ToInt32(long value)
        {
            if (value < (long)int.MinValue || value > (long)int.MaxValue)
                throw new OverflowException(SR.Format(SR.XmlConvert_Overflow, new string[] { XmlConvert.ToString(value), "Int32" }));

            return (int)value;
        }

        protected static uint Int64ToUInt32(long value)
        {
            if (value < (long)uint.MinValue || value > (long)uint.MaxValue)
                throw new OverflowException(SR.Format(SR.XmlConvert_Overflow, new string[] { XmlConvert.ToString(value), "UInt32" }));

            return (uint)value;
        }

        protected static DateTime UntypedAtomicToDateTime(string value)
        {
            return (DateTime)(new XsdDateTime(value, XsdDateTimeFlags.AllXsd));
        }

        protected static DateTimeOffset UntypedAtomicToDateTimeOffset(string value)
        {
            return (DateTimeOffset)(new XsdDateTime(value, XsdDateTimeFlags.AllXsd));
        }
    }

    internal class XmlNumeric10Converter : XmlBaseConverter
    {
        protected XmlNumeric10Converter(XmlSchemaType schemaType) : base(schemaType)
        {
        }

        public static XmlValueConverter Create(XmlSchemaType schemaType)
        {
            return new XmlNumeric10Converter(schemaType);
        }

        #region AUTOGENERATED_XMLNUMERIC10CONVERTER
        public override decimal ToDecimal(string value)
        {
            if (value == null) throw new ArgumentNullException(nameof(value));

            if (TypeCode == XmlTypeCode.Decimal) return XmlConvert.ToDecimal((string)value);
            return XmlConvert.ToInteger((string)value);
        }
        public override decimal ToDecimal(object value)
        {
            if (value == null) throw new ArgumentNullException(nameof(value));

            Type sourceType = value.GetType();

            if (sourceType == DecimalType) return ((decimal)value);
            if (sourceType == Int32Type) return ((decimal)(int)value);
            if (sourceType == Int64Type) return ((decimal)(long)value);
            if (sourceType == StringType) return this.ToDecimal((string)value);
            if (sourceType == XmlAtomicValueType) return ((decimal)((XmlAtomicValue)value).ValueAs(DecimalType));

            return (decimal)ChangeTypeWildcardDestination(value, DecimalType, null);
        }
        public override int ToInt32(long value)
        {
            return Int64ToInt32((long)value);
        }
        public override int ToInt32(string value)
        {
            if (value == null) throw new ArgumentNullException(nameof(value));

            if (TypeCode == XmlTypeCode.Decimal) return DecimalToInt32(XmlConvert.ToDecimal((string)value));
            return XmlConvert.ToInt32((string)value);
        }
        public override int ToInt32(object value)
        {
            if (value == null) throw new ArgumentNullException(nameof(value));

            Type sourceType = value.GetType();

            if (sourceType == DecimalType) return DecimalToInt32((decimal)value);
            if (sourceType == Int32Type) return ((int)value);
            if (sourceType == Int64Type) return Int64ToInt32((long)value);
            if (sourceType == StringType) return this.ToInt32((string)value);
            if (sourceType == XmlAtomicValueType) return ((XmlAtomicValue)value).ValueAsInt;

            return (int)ChangeTypeWildcardDestination(value, Int32Type, null);
        }
        public override long ToInt64(int value)
        {
            return ((long)(int)value);
        }
        public override long ToInt64(string value)
        {
            if (value == null) throw new ArgumentNullException(nameof(value));

            if (TypeCode == XmlTypeCode.Decimal) return DecimalToInt64(XmlConvert.ToDecimal((string)value));
            return XmlConvert.ToInt64((string)value);
        }
        public override long ToInt64(object value)
        {
            if (value == null) throw new ArgumentNullException(nameof(value));

            Type sourceType = value.GetType();

            if (sourceType == DecimalType) return DecimalToInt64((decimal)value);
            if (sourceType == Int32Type) return ((long)(int)value);
            if (sourceType == Int64Type) return ((long)value);
            if (sourceType == StringType) return this.ToInt64((string)value);
            if (sourceType == XmlAtomicValueType) return ((XmlAtomicValue)value).ValueAsLong;

            return (long)ChangeTypeWildcardDestination(value, Int64Type, null);
        }


        //-----------------------------------------------
        // ToSingle
        //-----------------------------------------------

        // This converter does not support conversions to Single.


        //-----------------------------------------------
        // ToString
        //-----------------------------------------------

        public override string ToString(decimal value)
        {
            if (TypeCode == XmlTypeCode.Decimal) return XmlConvert.ToString((decimal)value);
            return XmlConvert.ToString(decimal.Truncate((decimal)value));
        }
        public override string ToString(int value)
        {
            return XmlConvert.ToString((int)value);
        }
        public override string ToString(long value)
        {
            return XmlConvert.ToString((long)value);
        }
        public override string ToString(object value, IXmlNamespaceResolver nsResolver)
        {
            if (value == null) throw new ArgumentNullException(nameof(value));

            Type sourceType = value.GetType();

            if (sourceType == DecimalType) return this.ToString((decimal)value);
            if (sourceType == Int32Type) return XmlConvert.ToString((int)value);
            if (sourceType == Int64Type) return XmlConvert.ToString((long)value);
            if (sourceType == StringType) return ((string)value);
            if (sourceType == XmlAtomicValueType) return ((XmlAtomicValue)value).Value;

            return (string)ChangeTypeWildcardDestination(value, StringType, nsResolver);
        }


        //-----------------------------------------------
        // ChangeType
        //-----------------------------------------------

        public override object ChangeType(decimal value, Type destinationType)
        {
            if (destinationType == null) throw new ArgumentNullException(nameof(destinationType));

            if (destinationType == ObjectType) destinationType = DefaultClrType;
            if (destinationType == DecimalType) return ((decimal)value);
            if (destinationType == Int32Type) return DecimalToInt32((decimal)value);
            if (destinationType == Int64Type) return DecimalToInt64((decimal)value);
            if (destinationType == StringType) return this.ToString((decimal)value);
            if (destinationType == XmlAtomicValueType) return (new XmlAtomicValue(SchemaType, value));
            if (destinationType == XPathItemType) return (new XmlAtomicValue(SchemaType, value));

            return ChangeTypeWildcardSource(value, destinationType, null);
        }

        public override object ChangeType(int value, Type destinationType)
        {
            if (destinationType == null) throw new ArgumentNullException(nameof(destinationType));

            if (destinationType == ObjectType) destinationType = DefaultClrType;
            if (destinationType == DecimalType) return ((decimal)(int)value);
            if (destinationType == Int32Type) return ((int)value);
            if (destinationType == Int64Type) return ((long)(int)value);
            if (destinationType == StringType) return XmlConvert.ToString((int)value);
            if (destinationType == XmlAtomicValueType) return (new XmlAtomicValue(SchemaType, (int)value));
            if (destinationType == XPathItemType) return (new XmlAtomicValue(SchemaType, (int)value));

            return ChangeTypeWildcardSource(value, destinationType, null);
        }

        public override object ChangeType(long value, Type destinationType)
        {
            if (destinationType == null) throw new ArgumentNullException(nameof(destinationType));

            if (destinationType == ObjectType) destinationType = DefaultClrType;
            if (destinationType == DecimalType) return ((decimal)(long)value);
            if (destinationType == Int32Type) return Int64ToInt32((long)value);
            if (destinationType == Int64Type) return ((long)value);
            if (destinationType == StringType) return XmlConvert.ToString((long)value);
            if (destinationType == XmlAtomicValueType) return (new XmlAtomicValue(SchemaType, (long)value));
            if (destinationType == XPathItemType) return (new XmlAtomicValue(SchemaType, (long)value));

            return ChangeTypeWildcardSource(value, destinationType, null);
        }

        public override object ChangeType(string value, Type destinationType, IXmlNamespaceResolver nsResolver)
        {
            if (value == null) throw new ArgumentNullException(nameof(value));
            if (destinationType == null) throw new ArgumentNullException(nameof(destinationType));

            if (destinationType == ObjectType) destinationType = DefaultClrType;
            if (destinationType == DecimalType) return this.ToDecimal((string)value);
            if (destinationType == Int32Type) return this.ToInt32((string)value);
            if (destinationType == Int64Type) return this.ToInt64((string)value);
            if (destinationType == StringType) return ((string)value);
            if (destinationType == XmlAtomicValueType) return (new XmlAtomicValue(SchemaType, (string)value));
            if (destinationType == XPathItemType) return (new XmlAtomicValue(SchemaType, (string)value));

            return ChangeTypeWildcardSource(value, destinationType, nsResolver);
        }

        public override object ChangeType(object value, Type destinationType, IXmlNamespaceResolver nsResolver)
        {
            if (value == null) throw new ArgumentNullException(nameof(value));
            if (destinationType == null) throw new ArgumentNullException(nameof(destinationType));

            Type sourceType = value.GetType();

            if (destinationType == ObjectType) destinationType = DefaultClrType;
            if (destinationType == DecimalType) return this.ToDecimal(value);
            if (destinationType == Int32Type) return this.ToInt32(value);
            if (destinationType == Int64Type) return this.ToInt64(value);
            if (destinationType == StringType) return this.ToString(value, nsResolver);
            if (destinationType == XmlAtomicValueType)
            {
                if (sourceType == DecimalType) return (new XmlAtomicValue(SchemaType, value));
                if (sourceType == Int32Type) return (new XmlAtomicValue(SchemaType, (int)value));
                if (sourceType == Int64Type) return (new XmlAtomicValue(SchemaType, (long)value));
                if (sourceType == StringType) return (new XmlAtomicValue(SchemaType, (string)value));
                if (sourceType == XmlAtomicValueType) return ((XmlAtomicValue)value);
            }
            if (destinationType == XPathItemType)
            {
                if (sourceType == DecimalType) return (new XmlAtomicValue(SchemaType, value));
                if (sourceType == Int32Type) return (new XmlAtomicValue(SchemaType, (int)value));
                if (sourceType == Int64Type) return (new XmlAtomicValue(SchemaType, (long)value));
                if (sourceType == StringType) return (new XmlAtomicValue(SchemaType, (string)value));
                if (sourceType == XmlAtomicValueType) return ((XmlAtomicValue)value);
            }
            if (destinationType == ByteType) return Int32ToByte(this.ToInt32(value));
            if (destinationType == Int16Type) return Int32ToInt16(this.ToInt32(value));
            if (destinationType == SByteType) return Int32ToSByte(this.ToInt32(value));
            if (destinationType == UInt16Type) return Int32ToUInt16(this.ToInt32(value));
            if (destinationType == UInt32Type) return Int64ToUInt32(this.ToInt64(value));
            if (destinationType == UInt64Type) return DecimalToUInt64(this.ToDecimal(value));
            if (sourceType == ByteType) return this.ChangeType((int)(byte)value, destinationType);
            if (sourceType == Int16Type) return this.ChangeType((int)(short)value, destinationType);
            if (sourceType == SByteType) return this.ChangeType((int)(sbyte)value, destinationType);
            if (sourceType == UInt16Type) return this.ChangeType((int)(ushort)value, destinationType);
            if (sourceType == UInt32Type) return this.ChangeType((long)(uint)value, destinationType);
            if (sourceType == UInt64Type) return this.ChangeType((decimal)(ulong)value, destinationType);

            return ChangeListType(value, destinationType, nsResolver);
        }


        //-----------------------------------------------
        // Helpers
        //-----------------------------------------------

        private object ChangeTypeWildcardDestination(object value, Type destinationType, IXmlNamespaceResolver nsResolver)
        {
            Type sourceType = value.GetType();

            if (sourceType == ByteType) return this.ChangeType((int)(byte)value, destinationType);
            if (sourceType == Int16Type) return this.ChangeType((int)(short)value, destinationType);
            if (sourceType == SByteType) return this.ChangeType((int)(sbyte)value, destinationType);
            if (sourceType == UInt16Type) return this.ChangeType((int)(ushort)value, destinationType);
            if (sourceType == UInt32Type) return this.ChangeType((long)(uint)value, destinationType);
            if (sourceType == UInt64Type) return this.ChangeType((decimal)(ulong)value, destinationType);

            return ChangeListType(value, destinationType, nsResolver);
        }
        private object ChangeTypeWildcardSource(object value, Type destinationType, IXmlNamespaceResolver nsResolver)
        {
            if (destinationType == ByteType) return Int32ToByte(this.ToInt32(value));
            if (destinationType == Int16Type) return Int32ToInt16(this.ToInt32(value));
            if (destinationType == SByteType) return Int32ToSByte(this.ToInt32(value));
            if (destinationType == UInt16Type) return Int32ToUInt16(this.ToInt32(value));
            if (destinationType == UInt32Type) return Int64ToUInt32(this.ToInt64(value));
            if (destinationType == UInt64Type) return DecimalToUInt64(this.ToDecimal(value));

            return ChangeListType(value, destinationType, nsResolver);
        }
        #endregion
    }

    internal class XmlNumeric2Converter : XmlBaseConverter
    {
        protected XmlNumeric2Converter(XmlSchemaType schemaType) : base(schemaType)
        {
        }

        public static XmlValueConverter Create(XmlSchemaType schemaType)
        {
            return new XmlNumeric2Converter(schemaType);
        }

        #region AUTOGENERATED_XMLNUMERIC2CONVERTER
        public override double ToDouble(string value)
        {
            if (value == null) throw new ArgumentNullException(nameof(value));

            if (TypeCode == XmlTypeCode.Float) return ((double)XmlConvert.ToSingle((string)value));
            return XmlConvert.ToDouble((string)value);
        }
        public override double ToDouble(object value)
        {
            if (value == null) throw new ArgumentNullException(nameof(value));

            Type sourceType = value.GetType();

            if (sourceType == DoubleType) return ((double)value);
            if (sourceType == SingleType) return ((double)(float)value);
            if (sourceType == StringType) return this.ToDouble((string)value);
            if (sourceType == XmlAtomicValueType) return ((XmlAtomicValue)value).ValueAsDouble;

            return (double)ChangeListType(value, DoubleType, null);
        }


        //-----------------------------------------------
        // ToInt32
        //-----------------------------------------------

        // This converter does not support conversions to Int32.


        //-----------------------------------------------
        // ToInt64
        //-----------------------------------------------

        // This converter does not support conversions to Int64.


        //-----------------------------------------------
        // ToSingle
        //-----------------------------------------------

        public override float ToSingle(double value)
        {
            return ((float)(double)value);
        }
        public override float ToSingle(string value)
        {
            if (value == null) throw new ArgumentNullException(nameof(value));

            if (TypeCode == XmlTypeCode.Float) return XmlConvert.ToSingle((string)value);
            return ((float)XmlConvert.ToDouble((string)value));
        }
        public override float ToSingle(object value)
        {
            if (value == null) throw new ArgumentNullException(nameof(value));

            Type sourceType = value.GetType();

            if (sourceType == DoubleType) return ((float)(double)value);
            if (sourceType == SingleType) return ((float)value);
            if (sourceType == StringType) return this.ToSingle((string)value);
            if (sourceType == XmlAtomicValueType) return ((float)((XmlAtomicValue)value).ValueAs(SingleType));

            return (float)ChangeListType(value, SingleType, null);
        }


        //-----------------------------------------------
        // ToString
        //-----------------------------------------------

        public override string ToString(double value)
        {
            if (TypeCode == XmlTypeCode.Float) return XmlConvert.ToString(ToSingle((double)value));
            return XmlConvert.ToString((double)value);
        }
        public override string ToString(float value)
        {
            if (TypeCode == XmlTypeCode.Float) return XmlConvert.ToString((float)value);
            return XmlConvert.ToString((double)(float)value);
        }
        public override string ToString(object value, IXmlNamespaceResolver nsResolver)
        {
            if (value == null) throw new ArgumentNullException(nameof(value));

            Type sourceType = value.GetType();

            if (sourceType == DoubleType) return this.ToString((double)value);
            if (sourceType == SingleType) return this.ToString((float)value);
            if (sourceType == StringType) return ((string)value);
            if (sourceType == XmlAtomicValueType) return ((XmlAtomicValue)value).Value;

            return (string)ChangeListType(value, StringType, nsResolver);
        }


        //-----------------------------------------------
        // ChangeType
        //-----------------------------------------------

        public override object ChangeType(double value, Type destinationType)
        {
            if (destinationType == null) throw new ArgumentNullException(nameof(destinationType));

            if (destinationType == ObjectType) destinationType = DefaultClrType;
            if (destinationType == DoubleType) return ((double)value);
            if (destinationType == SingleType) return ((float)(double)value);
            if (destinationType == StringType) return this.ToString((double)value);
            if (destinationType == XmlAtomicValueType) return (new XmlAtomicValue(SchemaType, (double)value));
            if (destinationType == XPathItemType) return (new XmlAtomicValue(SchemaType, (double)value));

            return ChangeListType(value, destinationType, null);
        }

        public override object ChangeType(string value, Type destinationType, IXmlNamespaceResolver nsResolver)
        {
            if (value == null) throw new ArgumentNullException(nameof(value));
            if (destinationType == null) throw new ArgumentNullException(nameof(destinationType));

            if (destinationType == ObjectType) destinationType = DefaultClrType;
            if (destinationType == DoubleType) return this.ToDouble((string)value);
            if (destinationType == SingleType) return this.ToSingle((string)value);
            if (destinationType == StringType) return ((string)value);
            if (destinationType == XmlAtomicValueType) return (new XmlAtomicValue(SchemaType, (string)value));
            if (destinationType == XPathItemType) return (new XmlAtomicValue(SchemaType, (string)value));

            return ChangeListType(value, destinationType, nsResolver);
        }

        public override object ChangeType(object value, Type destinationType, IXmlNamespaceResolver nsResolver)
        {
            if (value == null) throw new ArgumentNullException(nameof(value));
            if (destinationType == null) throw new ArgumentNullException(nameof(destinationType));

            Type sourceType = value.GetType();

            if (destinationType == ObjectType) destinationType = DefaultClrType;
            if (destinationType == DoubleType) return this.ToDouble(value);
            if (destinationType == SingleType) return this.ToSingle(value);
            if (destinationType == StringType) return this.ToString(value, nsResolver);
            if (destinationType == XmlAtomicValueType)
            {
                if (sourceType == DoubleType) return (new XmlAtomicValue(SchemaType, (double)value));
                if (sourceType == SingleType) return (new XmlAtomicValue(SchemaType, value));
                if (sourceType == StringType) return (new XmlAtomicValue(SchemaType, (string)value));
                if (sourceType == XmlAtomicValueType) return ((XmlAtomicValue)value);
            }
            if (destinationType == XPathItemType)
            {
                if (sourceType == DoubleType) return (new XmlAtomicValue(SchemaType, (double)value));
                if (sourceType == SingleType) return (new XmlAtomicValue(SchemaType, value));
                if (sourceType == StringType) return (new XmlAtomicValue(SchemaType, (string)value));
                if (sourceType == XmlAtomicValueType) return ((XmlAtomicValue)value);
            }

            return ChangeListType(value, destinationType, nsResolver);
        }
        #endregion
    }

    internal class XmlDateTimeConverter : XmlBaseConverter
    {
        protected XmlDateTimeConverter(XmlSchemaType schemaType) : base(schemaType)
        {
        }

        public static XmlValueConverter Create(XmlSchemaType schemaType)
        {
            return new XmlDateTimeConverter(schemaType);
        }

        #region AUTOGENERATED_XMLDATETIMECONVERTER

        public override DateTime ToDateTime(DateTimeOffset value)
        {
            return DateTimeOffsetToDateTime(value);
        }

        public override DateTime ToDateTime(string value)
        {
            if (value == null) throw new ArgumentNullException(nameof(value));

            switch (TypeCode)
            {
                case XmlTypeCode.Date: return StringToDate((string)value);
                case XmlTypeCode.Time: return StringToTime((string)value);
                case XmlTypeCode.GDay: return StringToGDay((string)value);
                case XmlTypeCode.GMonth: return StringToGMonth((string)value);
                case XmlTypeCode.GMonthDay: return StringToGMonthDay((string)value);
                case XmlTypeCode.GYear: return StringToGYear((string)value);
                case XmlTypeCode.GYearMonth: return StringToGYearMonth((string)value);
            }
            return StringToDateTime((string)value);
        }
        public override DateTime ToDateTime(object value)
        {
            if (value == null) throw new ArgumentNullException(nameof(value));

            Type sourceType = value.GetType();

            if (sourceType == DateTimeType) return ((DateTime)value);
            if (sourceType == DateTimeOffsetType) return this.ToDateTime((DateTimeOffset)value);
            if (sourceType == StringType) return this.ToDateTime((string)value);
            if (sourceType == XmlAtomicValueType) return ((XmlAtomicValue)value).ValueAsDateTime;

            return (DateTime)ChangeListType(value, DateTimeType, null);
        }

        //-----------------------------------------------
        // ToDateTimeOffset
        //-----------------------------------------------

        public override DateTimeOffset ToDateTimeOffset(DateTime value)
        {
            return new DateTimeOffset(value);
        }

        public override DateTimeOffset ToDateTimeOffset(string value)
        {
            if (value == null) throw new ArgumentNullException(nameof(value));

            switch (TypeCode)
            {
                case XmlTypeCode.Date: return StringToDateOffset((string)value);
                case XmlTypeCode.Time: return StringToTimeOffset((string)value);
                case XmlTypeCode.GDay: return StringToGDayOffset((string)value);
                case XmlTypeCode.GMonth: return StringToGMonthOffset((string)value);
                case XmlTypeCode.GMonthDay: return StringToGMonthDayOffset((string)value);
                case XmlTypeCode.GYear: return StringToGYearOffset((string)value);
                case XmlTypeCode.GYearMonth: return StringToGYearMonthOffset((string)value);
            }
            return StringToDateTimeOffset((string)value);
        }

        public override DateTimeOffset ToDateTimeOffset(object value)
        {
            if (value == null) throw new ArgumentNullException(nameof(value));

            Type sourceType = value.GetType();

            if (sourceType == DateTimeType) return ToDateTimeOffset((DateTime)value);
            if (sourceType == DateTimeOffsetType) return ((DateTimeOffset)value);
            if (sourceType == StringType) return this.ToDateTimeOffset((string)value);
            if (sourceType == XmlAtomicValueType) return (DateTimeOffset)((XmlAtomicValue)value).ValueAsDateTime;

            return (DateTimeOffset)ChangeListType(value, DateTimeOffsetType, null);
        }

        //-----------------------------------------------
        // ToDecimal
        //-----------------------------------------------

        // This converter does not support conversions to Decimal.


        //-----------------------------------------------
        // ToDouble
        //-----------------------------------------------

        // This converter does not support conversions to Double.


        //-----------------------------------------------
        // ToInt32
        //-----------------------------------------------

        // This converter does not support conversions to Int32.


        //-----------------------------------------------
        // ToInt64
        //-----------------------------------------------

        // This converter does not support conversions to Int64.


        //-----------------------------------------------
        // ToSingle
        //-----------------------------------------------

        // This converter does not support conversions to Single.


        //-----------------------------------------------
        // ToString
        //-----------------------------------------------

        public override string ToString(DateTime value)
        {
            switch (TypeCode)
            {
                case XmlTypeCode.Date: return DateToString((DateTime)value);
                case XmlTypeCode.Time: return TimeToString((DateTime)value);
                case XmlTypeCode.GDay: return GDayToString((DateTime)value);
                case XmlTypeCode.GMonth: return GMonthToString((DateTime)value);
                case XmlTypeCode.GMonthDay: return GMonthDayToString((DateTime)value);
                case XmlTypeCode.GYear: return GYearToString((DateTime)value);
                case XmlTypeCode.GYearMonth: return GYearMonthToString((DateTime)value);
            }
            return DateTimeToString((DateTime)value);
        }

        public override string ToString(DateTimeOffset value)
        {
            switch (TypeCode)
            {
                case XmlTypeCode.Date: return DateOffsetToString((DateTimeOffset)value);
                case XmlTypeCode.Time: return TimeOffsetToString((DateTimeOffset)value);
                case XmlTypeCode.GDay: return GDayOffsetToString((DateTimeOffset)value);
                case XmlTypeCode.GMonth: return GMonthOffsetToString((DateTimeOffset)value);
                case XmlTypeCode.GMonthDay: return GMonthDayOffsetToString((DateTimeOffset)value);
                case XmlTypeCode.GYear: return GYearOffsetToString((DateTimeOffset)value);
                case XmlTypeCode.GYearMonth: return GYearMonthOffsetToString((DateTimeOffset)value);
            }
            return DateTimeOffsetToString((DateTimeOffset)value);
        }
        public override string ToString(object value, IXmlNamespaceResolver nsResolver)
        {
            if (value == null) throw new ArgumentNullException(nameof(value));

            Type sourceType = value.GetType();

            if (sourceType == DateTimeType) return this.ToString((DateTime)value);
            if (sourceType == DateTimeOffsetType) return this.ToString((DateTimeOffset)value);
            if (sourceType == StringType) return ((string)value);
            if (sourceType == XmlAtomicValueType) return ((XmlAtomicValue)value).Value;

            return (string)ChangeListType(value, StringType, nsResolver);
        }


        //-----------------------------------------------
        // ChangeType
        //-----------------------------------------------

        public override object ChangeType(DateTime value, Type destinationType)
        {
            if (destinationType == null) throw new ArgumentNullException(nameof(destinationType));

            if (destinationType == ObjectType) destinationType = DefaultClrType;
            if (destinationType == DateTimeType) return ((DateTime)value);
            if (destinationType == DateTimeOffsetType) return this.ToDateTimeOffset((DateTime)value);
            if (destinationType == StringType) return this.ToString((DateTime)value);
            if (destinationType == XmlAtomicValueType) return (new XmlAtomicValue(SchemaType, (DateTime)value));
            if (destinationType == XPathItemType) return (new XmlAtomicValue(SchemaType, (DateTime)value));

            return ChangeListType(value, destinationType, null);
        }

        public override object ChangeType(string value, Type destinationType, IXmlNamespaceResolver nsResolver)
        {
            if (value == null) throw new ArgumentNullException(nameof(value));
            if (destinationType == null) throw new ArgumentNullException(nameof(destinationType));

            if (destinationType == ObjectType) destinationType = DefaultClrType;
            if (destinationType == DateTimeType) return this.ToDateTime((string)value);
            if (destinationType == DateTimeOffsetType) return this.ToDateTimeOffset((string)value);
            if (destinationType == StringType) return ((string)value);
            if (destinationType == XmlAtomicValueType) return (new XmlAtomicValue(SchemaType, (string)value));
            if (destinationType == XPathItemType) return (new XmlAtomicValue(SchemaType, (string)value));

            return ChangeListType(value, destinationType, nsResolver);
        }

        public override object ChangeType(object value, Type destinationType, IXmlNamespaceResolver nsResolver)
        {
            if (value == null) throw new ArgumentNullException(nameof(value));
            if (destinationType == null) throw new ArgumentNullException(nameof(destinationType));

            Type sourceType = value.GetType();

            if (destinationType == ObjectType) destinationType = DefaultClrType;
            if (destinationType == DateTimeType) return this.ToDateTime(value);
            if (destinationType == DateTimeOffsetType) return this.ToDateTimeOffset(value);
            if (destinationType == StringType) return this.ToString(value, nsResolver);
            if (destinationType == XmlAtomicValueType)
            {
                if (sourceType == DateTimeType) return (new XmlAtomicValue(SchemaType, (DateTime)value));
                if (sourceType == DateTimeOffsetType) return (new XmlAtomicValue(SchemaType, (DateTimeOffset)value));
                if (sourceType == StringType) return (new XmlAtomicValue(SchemaType, (string)value));
                if (sourceType == XmlAtomicValueType) return ((XmlAtomicValue)value);
            }
            if (destinationType == XPathItemType)
            {
                if (sourceType == DateTimeType) return (new XmlAtomicValue(SchemaType, (DateTime)value));
                if (sourceType == DateTimeOffsetType) return (new XmlAtomicValue(SchemaType, (DateTimeOffset)value));
                if (sourceType == StringType) return (new XmlAtomicValue(SchemaType, (string)value));
                if (sourceType == XmlAtomicValueType) return ((XmlAtomicValue)value);
            }

            return ChangeListType(value, destinationType, nsResolver);
        }
        #endregion
    }

    internal class XmlBooleanConverter : XmlBaseConverter
    {
        protected XmlBooleanConverter(XmlSchemaType schemaType) : base(schemaType)
        {
        }

        public static XmlValueConverter Create(XmlSchemaType schemaType)
        {
            return new XmlBooleanConverter(schemaType);
        }

        #region AUTOGENERATED_XMLBOOLEANCONVERTER
        public override bool ToBoolean(string value)
        {
            if (value == null) throw new ArgumentNullException(nameof(value));

            return XmlConvert.ToBoolean((string)value);
        }
        public override bool ToBoolean(object value)
        {
            if (value == null) throw new ArgumentNullException(nameof(value));

            Type sourceType = value.GetType();

            if (sourceType == BooleanType) return ((bool)value);
            if (sourceType == StringType) return XmlConvert.ToBoolean((string)value);
            if (sourceType == XmlAtomicValueType) return ((XmlAtomicValue)value).ValueAsBoolean;

            return (bool)ChangeListType(value, BooleanType, null);
        }


        //-----------------------------------------------
        // ToDateTime
        //-----------------------------------------------

        // This converter does not support conversions to DateTime.


        //-----------------------------------------------
        // ToDecimal
        //-----------------------------------------------

        // This converter does not support conversions to Decimal.


        //-----------------------------------------------
        // ToDouble
        //-----------------------------------------------

        // This converter does not support conversions to Double.


        //-----------------------------------------------
        // ToInt32
        //-----------------------------------------------

        // This converter does not support conversions to Int32.


        //-----------------------------------------------
        // ToInt64
        //-----------------------------------------------

        // This converter does not support conversions to Int64.


        //-----------------------------------------------
        // ToSingle
        //-----------------------------------------------

        // This converter does not support conversions to Single.


        //-----------------------------------------------
        // ToString
        //-----------------------------------------------

        public override string ToString(bool value)
        {
            return XmlConvert.ToString((bool)value);
        }
        public override string ToString(object value, IXmlNamespaceResolver nsResolver)
        {
            if (value == null) throw new ArgumentNullException(nameof(value));

            Type sourceType = value.GetType();

            if (sourceType == BooleanType) return XmlConvert.ToString((bool)value);
            if (sourceType == StringType) return ((string)value);
            if (sourceType == XmlAtomicValueType) return ((XmlAtomicValue)value).Value;

            return (string)ChangeListType(value, StringType, nsResolver);
        }


        //-----------------------------------------------
        // ChangeType
        //-----------------------------------------------

        public override object ChangeType(bool value, Type destinationType)
        {
            if (destinationType == null) throw new ArgumentNullException(nameof(destinationType));

            if (destinationType == ObjectType) destinationType = DefaultClrType;
            if (destinationType == BooleanType) return ((bool)value);
            if (destinationType == StringType) return XmlConvert.ToString((bool)value);
            if (destinationType == XmlAtomicValueType) return (new XmlAtomicValue(SchemaType, (bool)value));
            if (destinationType == XPathItemType) return (new XmlAtomicValue(SchemaType, (bool)value));

            return ChangeListType(value, destinationType, null);
        }

        public override object ChangeType(string value, Type destinationType, IXmlNamespaceResolver nsResolver)
        {
            if (value == null) throw new ArgumentNullException(nameof(value));
            if (destinationType == null) throw new ArgumentNullException(nameof(destinationType));

            if (destinationType == ObjectType) destinationType = DefaultClrType;
            if (destinationType == BooleanType) return XmlConvert.ToBoolean((string)value);
            if (destinationType == StringType) return ((string)value);
            if (destinationType == XmlAtomicValueType) return (new XmlAtomicValue(SchemaType, (string)value));
            if (destinationType == XPathItemType) return (new XmlAtomicValue(SchemaType, (string)value));

            return ChangeListType(value, destinationType, nsResolver);
        }

        public override object ChangeType(object value, Type destinationType, IXmlNamespaceResolver nsResolver)
        {
            if (value == null) throw new ArgumentNullException(nameof(value));
            if (destinationType == null) throw new ArgumentNullException(nameof(destinationType));

            Type sourceType = value.GetType();

            if (destinationType == ObjectType) destinationType = DefaultClrType;
            if (destinationType == BooleanType) return this.ToBoolean(value);
            if (destinationType == StringType) return this.ToString(value, nsResolver);
            if (destinationType == XmlAtomicValueType)
            {
                if (sourceType == BooleanType) return (new XmlAtomicValue(SchemaType, (bool)value));
                if (sourceType == StringType) return (new XmlAtomicValue(SchemaType, (string)value));
                if (sourceType == XmlAtomicValueType) return ((XmlAtomicValue)value);
            }
            if (destinationType == XPathItemType)
            {
                if (sourceType == BooleanType) return (new XmlAtomicValue(SchemaType, (bool)value));
                if (sourceType == StringType) return (new XmlAtomicValue(SchemaType, (string)value));
                if (sourceType == XmlAtomicValueType) return ((XmlAtomicValue)value);
            }

            return ChangeListType(value, destinationType, nsResolver);
        }
        #endregion
    }

    internal class XmlMiscConverter : XmlBaseConverter
    {
        protected XmlMiscConverter(XmlSchemaType schemaType) : base(schemaType)
        {
        }

        public static XmlValueConverter Create(XmlSchemaType schemaType)
        {
            return new XmlMiscConverter(schemaType);
        }

        #region AUTOGENERATED_XMLMISCCONVERTER
        public override string ToString(object value, IXmlNamespaceResolver nsResolver)
        {
            if (value == null) throw new ArgumentNullException(nameof(value));

            Type sourceType = value.GetType();

            if (sourceType == ByteArrayType)
            {
                switch (TypeCode)
                {
                    case XmlTypeCode.Base64Binary: return Base64BinaryToString((byte[])value);
                    case XmlTypeCode.HexBinary: return XmlConvert.ToBinHexString((byte[])value);
                }
            }
            if (sourceType == StringType) return (string)value;
            if (IsDerivedFrom(sourceType, UriType)) if (TypeCode == XmlTypeCode.AnyUri) return AnyUriToString((Uri)value);
            if (sourceType == TimeSpanType)
            {
                switch (TypeCode)
                {
                    case XmlTypeCode.DayTimeDuration: return DayTimeDurationToString((TimeSpan)value);
                    case XmlTypeCode.Duration: return DurationToString((TimeSpan)value);
                    case XmlTypeCode.YearMonthDuration: return YearMonthDurationToString((TimeSpan)value);
                }
            }
            if (IsDerivedFrom(sourceType, XmlQualifiedNameType))
            {
                switch (TypeCode)
                {
                    case XmlTypeCode.Notation: return QNameToString((XmlQualifiedName)value, nsResolver);
                    case XmlTypeCode.QName: return QNameToString((XmlQualifiedName)value, nsResolver);
                }
            }

            return (string)ChangeTypeWildcardDestination(value, StringType, nsResolver);
        }


        //-----------------------------------------------
        // ChangeType
        //-----------------------------------------------

        public override object ChangeType(string value, Type destinationType, IXmlNamespaceResolver nsResolver)
        {
            if (value == null) throw new ArgumentNullException(nameof(value));
            if (destinationType == null) throw new ArgumentNullException(nameof(destinationType));

            if (destinationType == ObjectType) destinationType = DefaultClrType;
            if (destinationType == ByteArrayType)
            {
                switch (TypeCode)
                {
                    case XmlTypeCode.Base64Binary: return StringToBase64Binary((string)value);
                    case XmlTypeCode.HexBinary: return StringToHexBinary((string)value);
                }
            }
            if (destinationType == XmlQualifiedNameType)
            {
                switch (TypeCode)
                {
                    case XmlTypeCode.Notation: return StringToQName((string)value, nsResolver);
                    case XmlTypeCode.QName: return StringToQName((string)value, nsResolver);
                }
            }
            if (destinationType == StringType) return (string)value;
            if (destinationType == TimeSpanType)
            {
                switch (TypeCode)
                {
                    case XmlTypeCode.DayTimeDuration: return StringToDayTimeDuration((string)value);
                    case XmlTypeCode.Duration: return StringToDuration((string)value);
                    case XmlTypeCode.YearMonthDuration: return StringToYearMonthDuration((string)value);
                }
            }
            if (destinationType == UriType) if (TypeCode == XmlTypeCode.AnyUri) return XmlConvert.ToUri((string)value);
            if (destinationType == XmlAtomicValueType) return (new XmlAtomicValue(SchemaType, (string)value, nsResolver));

            return ChangeTypeWildcardSource(value, destinationType, nsResolver);
        }

        public override object ChangeType(object value, Type destinationType, IXmlNamespaceResolver nsResolver)
        {
            if (value == null) throw new ArgumentNullException(nameof(value));
            if (destinationType == null) throw new ArgumentNullException(nameof(destinationType));

            Type sourceType = value.GetType();

            if (destinationType == ObjectType) destinationType = DefaultClrType;
            if (destinationType == ByteArrayType)
            {
                if (sourceType == ByteArrayType)
                {
                    switch (TypeCode)
                    {
                        case XmlTypeCode.Base64Binary: return ((byte[])value);
                        case XmlTypeCode.HexBinary: return ((byte[])value);
                    }
                }
                if (sourceType == StringType)
                {
                    switch (TypeCode)
                    {
                        case XmlTypeCode.Base64Binary: return StringToBase64Binary((string)value);
                        case XmlTypeCode.HexBinary: return StringToHexBinary((string)value);
                    }
                }
            }
            if (destinationType == XmlQualifiedNameType)
            {
                if (sourceType == StringType)
                {
                    switch (TypeCode)
                    {
                        case XmlTypeCode.Notation: return StringToQName((string)value, nsResolver);
                        case XmlTypeCode.QName: return StringToQName((string)value, nsResolver);
                    }
                }
                if (IsDerivedFrom(sourceType, XmlQualifiedNameType))
                {
                    switch (TypeCode)
                    {
                        case XmlTypeCode.Notation: return ((XmlQualifiedName)value);
                        case XmlTypeCode.QName: return ((XmlQualifiedName)value);
                    }
                }
            }
            if (destinationType == StringType) return this.ToString(value, nsResolver);
            if (destinationType == TimeSpanType)
            {
                if (sourceType == StringType)
                {
                    switch (TypeCode)
                    {
                        case XmlTypeCode.DayTimeDuration: return StringToDayTimeDuration((string)value);
                        case XmlTypeCode.Duration: return StringToDuration((string)value);
                        case XmlTypeCode.YearMonthDuration: return StringToYearMonthDuration((string)value);
                    }
                }
                if (sourceType == TimeSpanType)
                {
                    switch (TypeCode)
                    {
                        case XmlTypeCode.DayTimeDuration: return ((TimeSpan)value);
                        case XmlTypeCode.Duration: return ((TimeSpan)value);
                        case XmlTypeCode.YearMonthDuration: return ((TimeSpan)value);
                    }
                }
            }
            if (destinationType == UriType)
            {
                if (sourceType == StringType) if (TypeCode == XmlTypeCode.AnyUri) return XmlConvert.ToUri((string)value);
                if (IsDerivedFrom(sourceType, UriType)) if (TypeCode == XmlTypeCode.AnyUri) return ((Uri)value);
            }
            if (destinationType == XmlAtomicValueType)
            {
                if (sourceType == ByteArrayType)
                {
                    switch (TypeCode)
                    {
                        case XmlTypeCode.Base64Binary: return (new XmlAtomicValue(SchemaType, value));
                        case XmlTypeCode.HexBinary: return (new XmlAtomicValue(SchemaType, value));
                    }
                }
                if (sourceType == StringType) return (new XmlAtomicValue(SchemaType, (string)value, nsResolver));
                if (sourceType == TimeSpanType)
                {
                    switch (TypeCode)
                    {
                        case XmlTypeCode.DayTimeDuration: return (new XmlAtomicValue(SchemaType, value));
                        case XmlTypeCode.Duration: return (new XmlAtomicValue(SchemaType, value));
                        case XmlTypeCode.YearMonthDuration: return (new XmlAtomicValue(SchemaType, value));
                    }
                }
                if (IsDerivedFrom(sourceType, UriType)) if (TypeCode == XmlTypeCode.AnyUri) return (new XmlAtomicValue(SchemaType, value));
                if (sourceType == XmlAtomicValueType) return ((XmlAtomicValue)value);
                if (IsDerivedFrom(sourceType, XmlQualifiedNameType))
                {
                    switch (TypeCode)
                    {
                        case XmlTypeCode.Notation: return (new XmlAtomicValue(SchemaType, value, nsResolver));
                        case XmlTypeCode.QName: return (new XmlAtomicValue(SchemaType, value, nsResolver));
                    }
                }
            }
            if (destinationType == XPathItemType)
            {
                if (sourceType == XmlAtomicValueType) return ((XmlAtomicValue)value);
            }
            if (destinationType == XPathItemType) return ((XPathItem)this.ChangeType(value, XmlAtomicValueType, nsResolver));
            if (sourceType == XmlAtomicValueType) return ((XmlAtomicValue)value).ValueAs(destinationType, nsResolver);

            return ChangeListType(value, destinationType, nsResolver);
        }


        //-----------------------------------------------
        // Helpers
        //-----------------------------------------------

        private object ChangeTypeWildcardDestination(object value, Type destinationType, IXmlNamespaceResolver nsResolver)
        {
            Type sourceType = value.GetType();

            if (sourceType == XmlAtomicValueType) return ((XmlAtomicValue)value).ValueAs(destinationType, nsResolver);

            return ChangeListType(value, destinationType, nsResolver);
        }
        private object ChangeTypeWildcardSource(object value, Type destinationType, IXmlNamespaceResolver nsResolver)
        {
            if (destinationType == XPathItemType) return ((XPathItem)this.ChangeType(value, XmlAtomicValueType, nsResolver));

            return ChangeListType(value, destinationType, nsResolver);
        }
        #endregion
    }

    internal class XmlStringConverter : XmlBaseConverter
    {
        protected XmlStringConverter(XmlSchemaType schemaType) : base(schemaType)
        {
        }

        public static XmlValueConverter Create(XmlSchemaType schemaType)
        {
            return new XmlStringConverter(schemaType);
        }

        #region AUTOGENERATED_XMLSTRINGCONVERTER
        public override string ToString(object value, IXmlNamespaceResolver nsResolver)
        {
            if (value == null) throw new ArgumentNullException(nameof(value));

            Type sourceType = value.GetType();

            if (sourceType == StringType) return ((string)value);
            if (sourceType == XmlAtomicValueType) return ((XmlAtomicValue)value).Value;

            return (string)ChangeListType(value, StringType, nsResolver);
        }


        //-----------------------------------------------
        // ChangeType
        //-----------------------------------------------

        public override object ChangeType(string value, Type destinationType, IXmlNamespaceResolver nsResolver)
        {
            if (value == null) throw new ArgumentNullException(nameof(value));
            if (destinationType == null) throw new ArgumentNullException(nameof(destinationType));

            if (destinationType == ObjectType) destinationType = DefaultClrType;
            if (destinationType == StringType) return ((string)value);
            if (destinationType == XmlAtomicValueType) return (new XmlAtomicValue(SchemaType, (string)value));
            if (destinationType == XPathItemType) return (new XmlAtomicValue(SchemaType, (string)value));

            return ChangeListType(value, destinationType, nsResolver);
        }

        public override object ChangeType(object value, Type destinationType, IXmlNamespaceResolver nsResolver)
        {
            if (value == null) throw new ArgumentNullException(nameof(value));
            if (destinationType == null) throw new ArgumentNullException(nameof(destinationType));

            Type sourceType = value.GetType();

            if (destinationType == ObjectType) destinationType = DefaultClrType;
            if (destinationType == StringType) return this.ToString(value, nsResolver);
            if (destinationType == XmlAtomicValueType)
            {
                if (sourceType == StringType) return (new XmlAtomicValue(SchemaType, (string)value));
                if (sourceType == XmlAtomicValueType) return ((XmlAtomicValue)value);
            }
            if (destinationType == XPathItemType)
            {
                if (sourceType == StringType) return (new XmlAtomicValue(SchemaType, (string)value));
                if (sourceType == XmlAtomicValueType) return ((XmlAtomicValue)value);
            }

            return ChangeListType(value, destinationType, nsResolver);
        }
        #endregion
    }

    internal class XmlUntypedConverter : XmlListConverter
    {
        private bool _allowListToList;

        protected XmlUntypedConverter() : base(DatatypeImplementation.UntypedAtomicType)
        {
        }

        protected XmlUntypedConverter(XmlUntypedConverter atomicConverter, bool allowListToList)
            : base(atomicConverter, allowListToList ? StringArrayType : StringType)
        {
            _allowListToList = allowListToList;
        }

        public static readonly XmlValueConverter Untyped = new XmlUntypedConverter(new XmlUntypedConverter(), false);
        public static readonly XmlValueConverter UntypedList = new XmlUntypedConverter(new XmlUntypedConverter(), true);

        #region AUTOGENERATED_XMLUNTYPEDCONVERTER

        //-----------------------------------------------
        // ToBoolean
        //-----------------------------------------------

        public override bool ToBoolean(string value)
        {
            if (value == null) throw new ArgumentNullException(nameof(value));

            return XmlConvert.ToBoolean((string)value);
        }
        public override bool ToBoolean(object value)
        {
            if (value == null) throw new ArgumentNullException(nameof(value));

            Type sourceType = value.GetType();

            if (sourceType == StringType) return XmlConvert.ToBoolean((string)value);

            return (bool)ChangeTypeWildcardDestination(value, BooleanType, null);
        }


        //-----------------------------------------------
        // ToDateTime
        //-----------------------------------------------

        public override DateTime ToDateTime(string value)
        {
            if (value == null) throw new ArgumentNullException(nameof(value));

            return UntypedAtomicToDateTime((string)value);
        }
        public override DateTime ToDateTime(object value)
        {
            if (value == null) throw new ArgumentNullException(nameof(value));

            Type sourceType = value.GetType();

            if (sourceType == StringType) return UntypedAtomicToDateTime((string)value);

            return (DateTime)ChangeTypeWildcardDestination(value, DateTimeType, null);
        }

        //-----------------------------------------------
        // ToDateTimeOffset
        //-----------------------------------------------

        public override DateTimeOffset ToDateTimeOffset(string value)
        {
            if (value == null) throw new ArgumentNullException(nameof(value));

            return UntypedAtomicToDateTimeOffset((string)value);
        }

        public override DateTimeOffset ToDateTimeOffset(object value)
        {
            if (value == null) throw new ArgumentNullException(nameof(value));

            Type sourceType = value.GetType();

            if (sourceType == StringType) return UntypedAtomicToDateTimeOffset((string)value);

            return (DateTimeOffset)ChangeTypeWildcardDestination(value, DateTimeOffsetType, null);
        }

        //-----------------------------------------------
        // ToDecimal
        //-----------------------------------------------

        public override decimal ToDecimal(string value)
        {
            if (value == null) throw new ArgumentNullException(nameof(value));

            return XmlConvert.ToDecimal((string)value);
        }
        public override decimal ToDecimal(object value)
        {
            if (value == null) throw new ArgumentNullException(nameof(value));

            Type sourceType = value.GetType();

            if (sourceType == StringType) return XmlConvert.ToDecimal((string)value);

            return (decimal)ChangeTypeWildcardDestination(value, DecimalType, null);
        }


        //-----------------------------------------------
        // ToDouble
        //-----------------------------------------------

        public override double ToDouble(string value)
        {
            if (value == null) throw new ArgumentNullException(nameof(value));

            return XmlConvert.ToDouble((string)value);
        }
        public override double ToDouble(object value)
        {
            if (value == null) throw new ArgumentNullException(nameof(value));

            Type sourceType = value.GetType();

            if (sourceType == StringType) return XmlConvert.ToDouble((string)value);

            return (double)ChangeTypeWildcardDestination(value, DoubleType, null);
        }


        //-----------------------------------------------
        // ToInt32
        //-----------------------------------------------

        public override int ToInt32(string value)
        {
            if (value == null) throw new ArgumentNullException(nameof(value));

            return XmlConvert.ToInt32((string)value);
        }
        public override int ToInt32(object value)
        {
            if (value == null) throw new ArgumentNullException(nameof(value));

            Type sourceType = value.GetType();

            if (sourceType == StringType) return XmlConvert.ToInt32((string)value);

            return (int)ChangeTypeWildcardDestination(value, Int32Type, null);
        }


        //-----------------------------------------------
        // ToInt64
        //-----------------------------------------------

        public override long ToInt64(string value)
        {
            if (value == null) throw new ArgumentNullException(nameof(value));

            return XmlConvert.ToInt64((string)value);
        }
        public override long ToInt64(object value)
        {
            if (value == null) throw new ArgumentNullException(nameof(value));

            Type sourceType = value.GetType();

            if (sourceType == StringType) return XmlConvert.ToInt64((string)value);

            return (long)ChangeTypeWildcardDestination(value, Int64Type, null);
        }


        //-----------------------------------------------
        // ToSingle
        //-----------------------------------------------

        public override float ToSingle(string value)
        {
            if (value == null) throw new ArgumentNullException(nameof(value));

            return XmlConvert.ToSingle((string)value);
        }
        public override float ToSingle(object value)
        {
            if (value == null) throw new ArgumentNullException(nameof(value));

            Type sourceType = value.GetType();

            if (sourceType == StringType) return XmlConvert.ToSingle((string)value);

            return (float)ChangeTypeWildcardDestination(value, SingleType, null);
        }


        //-----------------------------------------------
        // ToString
        //-----------------------------------------------

        public override string ToString(bool value)
        {
            return XmlConvert.ToString((bool)value);
        }
        public override string ToString(DateTime value)
        {
            return DateTimeToString((DateTime)value);
        }
        public override string ToString(DateTimeOffset value)
        {
            return DateTimeOffsetToString((DateTimeOffset)value);
        }
        public override string ToString(decimal value)
        {
            return XmlConvert.ToString((decimal)value);
        }
        public override string ToString(double value)
        {
            return XmlConvert.ToString((double)value);
        }
        public override string ToString(int value)
        {
            return XmlConvert.ToString((int)value);
        }
        public override string ToString(long value)
        {
            return XmlConvert.ToString((long)value);
        }
        public override string ToString(float value)
        {
            return XmlConvert.ToString((float)value);
        }
        public override string ToString(object value, IXmlNamespaceResolver nsResolver)
        {
            if (value == null) throw new ArgumentNullException(nameof(value));

            Type sourceType = value.GetType();

            if (sourceType == BooleanType) return XmlConvert.ToString((bool)value);
            if (sourceType == ByteType) return XmlConvert.ToString((byte)value);
            if (sourceType == ByteArrayType) return Base64BinaryToString((byte[])value);
            if (sourceType == DateTimeType) return DateTimeToString((DateTime)value);
            if (sourceType == DateTimeOffsetType) return DateTimeOffsetToString((DateTimeOffset)value);
            if (sourceType == DecimalType) return XmlConvert.ToString((decimal)value);
            if (sourceType == DoubleType) return XmlConvert.ToString((double)value);
            if (sourceType == Int16Type) return XmlConvert.ToString((short)value);
            if (sourceType == Int32Type) return XmlConvert.ToString((int)value);
            if (sourceType == Int64Type) return XmlConvert.ToString((long)value);
            if (sourceType == SByteType) return XmlConvert.ToString((sbyte)value);
            if (sourceType == SingleType) return XmlConvert.ToString((float)value);
            if (sourceType == StringType) return ((string)value);
            if (sourceType == TimeSpanType) return DurationToString((TimeSpan)value);
            if (sourceType == UInt16Type) return XmlConvert.ToString((ushort)value);
            if (sourceType == UInt32Type) return XmlConvert.ToString((uint)value);
            if (sourceType == UInt64Type) return XmlConvert.ToString((ulong)value);
            if (IsDerivedFrom(sourceType, UriType)) return AnyUriToString((Uri)value);
            if (sourceType == XmlAtomicValueType) return ((string)((XmlAtomicValue)value).ValueAs(StringType, nsResolver));
            if (IsDerivedFrom(sourceType, XmlQualifiedNameType)) return QNameToString((XmlQualifiedName)value, nsResolver);

            return (string)ChangeTypeWildcardDestination(value, StringType, nsResolver);
        }


        //-----------------------------------------------
        // ChangeType
        //-----------------------------------------------

        public override object ChangeType(bool value, Type destinationType)
        {
            if (destinationType == null) throw new ArgumentNullException(nameof(destinationType));

            if (destinationType == ObjectType) destinationType = DefaultClrType;
            if (destinationType == StringType) return XmlConvert.ToString((bool)value);

            return ChangeTypeWildcardSource(value, destinationType, null);
        }

        public override object ChangeType(DateTime value, Type destinationType)
        {
            if (destinationType == null) throw new ArgumentNullException(nameof(destinationType));

            if (destinationType == ObjectType) destinationType = DefaultClrType;
            if (destinationType == StringType) return DateTimeToString((DateTime)value);

            return ChangeTypeWildcardSource(value, destinationType, null);
        }

        public override object ChangeType(decimal value, Type destinationType)
        {
            if (destinationType == null) throw new ArgumentNullException(nameof(destinationType));

            if (destinationType == ObjectType) destinationType = DefaultClrType;
            if (destinationType == StringType) return XmlConvert.ToString((decimal)value);

            return ChangeTypeWildcardSource(value, destinationType, null);
        }

        public override object ChangeType(double value, Type destinationType)
        {
            if (destinationType == null) throw new ArgumentNullException(nameof(destinationType));

            if (destinationType == ObjectType) destinationType = DefaultClrType;
            if (destinationType == StringType) return XmlConvert.ToString((double)value);

            return ChangeTypeWildcardSource(value, destinationType, null);
        }

        public override object ChangeType(int value, Type destinationType)
        {
            if (destinationType == null) throw new ArgumentNullException(nameof(destinationType));

            if (destinationType == ObjectType) destinationType = DefaultClrType;
            if (destinationType == StringType) return XmlConvert.ToString((int)value);

            return ChangeTypeWildcardSource(value, destinationType, null);
        }

        public override object ChangeType(long value, Type destinationType)
        {
            if (destinationType == null) throw new ArgumentNullException(nameof(destinationType));

            if (destinationType == ObjectType) destinationType = DefaultClrType;
            if (destinationType == StringType) return XmlConvert.ToString((long)value);

            return ChangeTypeWildcardSource(value, destinationType, null);
        }

        public override object ChangeType(string value, Type destinationType, IXmlNamespaceResolver nsResolver)
        {
            if (value == null) throw new ArgumentNullException(nameof(value));
            if (destinationType == null) throw new ArgumentNullException(nameof(destinationType));

            if (destinationType == ObjectType) destinationType = DefaultClrType;
            if (destinationType == BooleanType) return XmlConvert.ToBoolean((string)value);
            if (destinationType == ByteType) return Int32ToByte(XmlConvert.ToInt32((string)value));
            if (destinationType == ByteArrayType) return StringToBase64Binary((string)value);
            if (destinationType == DateTimeType) return UntypedAtomicToDateTime((string)value);
            if (destinationType == DateTimeOffsetType) return UntypedAtomicToDateTimeOffset((string)value);
            if (destinationType == DecimalType) return XmlConvert.ToDecimal((string)value);
            if (destinationType == DoubleType) return XmlConvert.ToDouble((string)value);
            if (destinationType == Int16Type) return Int32ToInt16(XmlConvert.ToInt32((string)value));
            if (destinationType == Int32Type) return XmlConvert.ToInt32((string)value);
            if (destinationType == Int64Type) return XmlConvert.ToInt64((string)value);
            if (destinationType == SByteType) return Int32ToSByte(XmlConvert.ToInt32((string)value));
            if (destinationType == SingleType) return XmlConvert.ToSingle((string)value);
            if (destinationType == TimeSpanType) return StringToDuration((string)value);
            if (destinationType == UInt16Type) return Int32ToUInt16(XmlConvert.ToInt32((string)value));
            if (destinationType == UInt32Type) return Int64ToUInt32(XmlConvert.ToInt64((string)value));
            if (destinationType == UInt64Type) return DecimalToUInt64(XmlConvert.ToDecimal((string)value));
            if (destinationType == UriType) return XmlConvert.ToUri((string)value);
            if (destinationType == XmlAtomicValueType) return (new XmlAtomicValue(SchemaType, (string)value));
            if (destinationType == XmlQualifiedNameType) return StringToQName((string)value, nsResolver);
            if (destinationType == XPathItemType) return (new XmlAtomicValue(SchemaType, (string)value));
            if (destinationType == StringType) return ((string)value);

            return ChangeTypeWildcardSource(value, destinationType, nsResolver);
        }

        public override object ChangeType(object value, Type destinationType, IXmlNamespaceResolver nsResolver)
        {
            if (value == null) throw new ArgumentNullException(nameof(value));
            if (destinationType == null) throw new ArgumentNullException(nameof(destinationType));

            Type sourceType = value.GetType();

            if (destinationType == ObjectType) destinationType = DefaultClrType;
            if (destinationType == BooleanType)
            {
                if (sourceType == StringType) return XmlConvert.ToBoolean((string)value);
            }
            if (destinationType == ByteType)
            {
                if (sourceType == StringType) return Int32ToByte(XmlConvert.ToInt32((string)value));
            }
            if (destinationType == ByteArrayType)
            {
                if (sourceType == StringType) return StringToBase64Binary((string)value);
            }
            if (destinationType == DateTimeType)
            {
                if (sourceType == StringType) return UntypedAtomicToDateTime((string)value);
            }
            if (destinationType == DateTimeOffsetType)
            {
                if (sourceType == StringType) return UntypedAtomicToDateTimeOffset((string)value);
            }
            if (destinationType == DecimalType)
            {
                if (sourceType == StringType) return XmlConvert.ToDecimal((string)value);
            }
            if (destinationType == DoubleType)
            {
                if (sourceType == StringType) return XmlConvert.ToDouble((string)value);
            }
            if (destinationType == Int16Type)
            {
                if (sourceType == StringType) return Int32ToInt16(XmlConvert.ToInt32((string)value));
            }
            if (destinationType == Int32Type)
            {
                if (sourceType == StringType) return XmlConvert.ToInt32((string)value);
            }
            if (destinationType == Int64Type)
            {
                if (sourceType == StringType) return XmlConvert.ToInt64((string)value);
            }
            if (destinationType == SByteType)
            {
                if (sourceType == StringType) return Int32ToSByte(XmlConvert.ToInt32((string)value));
            }
            if (destinationType == SingleType)
            {
                if (sourceType == StringType) return XmlConvert.ToSingle((string)value);
            }
            if (destinationType == TimeSpanType)
            {
                if (sourceType == StringType) return StringToDuration((string)value);
            }
            if (destinationType == UInt16Type)
            {
                if (sourceType == StringType) return Int32ToUInt16(XmlConvert.ToInt32((string)value));
            }
            if (destinationType == UInt32Type)
            {
                if (sourceType == StringType) return Int64ToUInt32(XmlConvert.ToInt64((string)value));
            }
            if (destinationType == UInt64Type)
            {
                if (sourceType == StringType) return DecimalToUInt64(XmlConvert.ToDecimal((string)value));
            }
            if (destinationType == UriType)
            {
                if (sourceType == StringType) return XmlConvert.ToUri((string)value);
            }
            if (destinationType == XmlAtomicValueType)
            {
                if (sourceType == StringType) return (new XmlAtomicValue(SchemaType, (string)value));
                if (sourceType == XmlAtomicValueType) return ((XmlAtomicValue)value);
            }
            if (destinationType == XmlQualifiedNameType)
            {
                if (sourceType == StringType) return StringToQName((string)value, nsResolver);
            }
            if (destinationType == XPathItemType)
            {
                if (sourceType == StringType) return (new XmlAtomicValue(SchemaType, (string)value));
                if (sourceType == XmlAtomicValueType) return ((XmlAtomicValue)value);
            }
            if (destinationType == StringType) return this.ToString(value, nsResolver);
            if (destinationType == XmlAtomicValueType) return (new XmlAtomicValue(SchemaType, this.ToString(value, nsResolver)));
            if (destinationType == XPathItemType) return (new XmlAtomicValue(SchemaType, this.ToString(value, nsResolver)));
            if (sourceType == XmlAtomicValueType) return ((XmlAtomicValue)value).ValueAs(destinationType, nsResolver);

            return ChangeListType(value, destinationType, nsResolver);
        }


        //-----------------------------------------------
        // Helpers
        //-----------------------------------------------

        private object ChangeTypeWildcardDestination(object value, Type destinationType, IXmlNamespaceResolver nsResolver)
        {
            Type sourceType = value.GetType();

            if (sourceType == XmlAtomicValueType) return ((XmlAtomicValue)value).ValueAs(destinationType, nsResolver);

            return ChangeListType(value, destinationType, nsResolver);
        }
        private object ChangeTypeWildcardSource(object value, Type destinationType, IXmlNamespaceResolver nsResolver)
        {
            if (destinationType == XmlAtomicValueType) return (new XmlAtomicValue(SchemaType, this.ToString(value, nsResolver)));
            if (destinationType == XPathItemType) return (new XmlAtomicValue(SchemaType, this.ToString(value, nsResolver)));

            return ChangeListType(value, destinationType, nsResolver);
        }
        #endregion


        //-----------------------------------------------
        // Helpers
        //-----------------------------------------------

        protected override object ChangeListType(object value, Type destinationType, IXmlNamespaceResolver nsResolver)
        {
            Type sourceType = value.GetType();

            // 1. If there is no nested atomic converter, then do not support lists at all
            // 2. If list to list conversions are not allowed, only allow string => list and list => string
            if ((this.atomicConverter == null) || (!_allowListToList && sourceType != StringType && destinationType != StringType))
            {
                if (SupportsType(sourceType))
                    throw new InvalidCastException(SR.Format(SR.XmlConvert_TypeToString, XmlTypeName, sourceType.Name));

                if (SupportsType(destinationType))
                    throw new InvalidCastException(SR.Format(SR.XmlConvert_TypeFromString, XmlTypeName, destinationType.Name));

                throw CreateInvalidClrMappingException(sourceType, destinationType);
            }

            return base.ChangeListType(value, destinationType, nsResolver);
        }

        private bool SupportsType(Type clrType)
        {
            if (clrType == BooleanType) return true;
            if (clrType == ByteType) return true;
            if (clrType == ByteArrayType) return true;
            if (clrType == DateTimeType) return true;
            if (clrType == DateTimeOffsetType) return true;
            if (clrType == DecimalType) return true;
            if (clrType == DoubleType) return true;
            if (clrType == Int16Type) return true;
            if (clrType == Int32Type) return true;
            if (clrType == Int64Type) return true;
            if (clrType == SByteType) return true;
            if (clrType == SingleType) return true;
            if (clrType == TimeSpanType) return true;
            if (clrType == UInt16Type) return true;
            if (clrType == UInt32Type) return true;
            if (clrType == UInt64Type) return true;
            if (clrType == UriType) return true;
            if (clrType == XmlQualifiedNameType) return true;

            return false;
        }
    }

    internal class XmlAnyConverter : XmlBaseConverter
    {
        protected XmlAnyConverter(XmlTypeCode typeCode) : base(typeCode)
        {
        }

        public static readonly XmlValueConverter Item = new XmlAnyConverter(XmlTypeCode.Item);
        public static readonly XmlValueConverter AnyAtomic = new XmlAnyConverter(XmlTypeCode.AnyAtomicType);

        #region AUTOGENERATED_XMLANYCONVERTER

        //-----------------------------------------------
        // ToBoolean
        //-----------------------------------------------

        public override bool ToBoolean(object value)
        {
            if (value == null) throw new ArgumentNullException(nameof(value));

            Type sourceType = value.GetType();

            if (sourceType == XmlAtomicValueType) return ((XmlAtomicValue)value).ValueAsBoolean;

            return (bool)ChangeTypeWildcardDestination(value, BooleanType, null);
        }


        //-----------------------------------------------
        // ToDateTime
        //-----------------------------------------------

        public override DateTime ToDateTime(object value)
        {
            if (value == null) throw new ArgumentNullException(nameof(value));

            Type sourceType = value.GetType();

            if (sourceType == XmlAtomicValueType) return ((XmlAtomicValue)value).ValueAsDateTime;

            return (DateTime)ChangeTypeWildcardDestination(value, DateTimeType, null);
        }

        //-----------------------------------------------
        // ToDateTimeOffset
        //-----------------------------------------------

        public override DateTimeOffset ToDateTimeOffset(object value)
        {
            if (value == null) throw new ArgumentNullException(nameof(value));

            Type sourceType = value.GetType();

            if (sourceType == XmlAtomicValueType) return (DateTimeOffset)((XmlAtomicValue)value).ValueAs(DateTimeOffsetType);

            return (DateTimeOffset)ChangeTypeWildcardDestination(value, DateTimeOffsetType, null);
        }


        //-----------------------------------------------
        // ToDecimal
        //-----------------------------------------------

        public override decimal ToDecimal(object value)
        {
            if (value == null) throw new ArgumentNullException(nameof(value));

            Type sourceType = value.GetType();

            if (sourceType == XmlAtomicValueType) return ((decimal)((XmlAtomicValue)value).ValueAs(DecimalType));

            return (decimal)ChangeTypeWildcardDestination(value, DecimalType, null);
        }


        //-----------------------------------------------
        // ToDouble
        //-----------------------------------------------

        public override double ToDouble(object value)
        {
            if (value == null) throw new ArgumentNullException(nameof(value));

            Type sourceType = value.GetType();

            if (sourceType == XmlAtomicValueType) return ((XmlAtomicValue)value).ValueAsDouble;

            return (double)ChangeTypeWildcardDestination(value, DoubleType, null);
        }


        //-----------------------------------------------
        // ToInt32
        //-----------------------------------------------

        public override int ToInt32(object value)
        {
            if (value == null) throw new ArgumentNullException(nameof(value));

            Type sourceType = value.GetType();

            if (sourceType == XmlAtomicValueType) return ((XmlAtomicValue)value).ValueAsInt;

            return (int)ChangeTypeWildcardDestination(value, Int32Type, null);
        }


        //-----------------------------------------------
        // ToInt64
        //-----------------------------------------------

        public override long ToInt64(object value)
        {
            if (value == null) throw new ArgumentNullException(nameof(value));

            Type sourceType = value.GetType();

            if (sourceType == XmlAtomicValueType) return ((XmlAtomicValue)value).ValueAsLong;

            return (long)ChangeTypeWildcardDestination(value, Int64Type, null);
        }


        //-----------------------------------------------
        // ToSingle
        //-----------------------------------------------

        public override float ToSingle(object value)
        {
            if (value == null) throw new ArgumentNullException(nameof(value));

            Type sourceType = value.GetType();

            if (sourceType == XmlAtomicValueType) return ((float)((XmlAtomicValue)value).ValueAs(SingleType));

            return (float)ChangeTypeWildcardDestination(value, SingleType, null);
        }


        //-----------------------------------------------
        // ToString
        //-----------------------------------------------

        // This converter does not support conversions to String.


        //-----------------------------------------------
        // ChangeType
        //-----------------------------------------------

        public override object ChangeType(bool value, Type destinationType)
        {
            if (destinationType == null) throw new ArgumentNullException(nameof(destinationType));

            if (destinationType == ObjectType) destinationType = DefaultClrType;
            if (destinationType == XmlAtomicValueType) return (new XmlAtomicValue(XmlSchemaType.GetBuiltInSimpleType(XmlTypeCode.Boolean), (bool)value));

            return ChangeTypeWildcardSource(value, destinationType, null);
        }

        public override object ChangeType(DateTime value, Type destinationType)
        {
            if (destinationType == null) throw new ArgumentNullException(nameof(destinationType));

            if (destinationType == ObjectType) destinationType = DefaultClrType;
            if (destinationType == XmlAtomicValueType) return (new XmlAtomicValue(XmlSchemaType.GetBuiltInSimpleType(XmlTypeCode.DateTime), (DateTime)value));

            return ChangeTypeWildcardSource(value, destinationType, null);
        }

        public override object ChangeType(decimal value, Type destinationType)
        {
            if (destinationType == null) throw new ArgumentNullException(nameof(destinationType));

            if (destinationType == ObjectType) destinationType = DefaultClrType;
            if (destinationType == XmlAtomicValueType) return (new XmlAtomicValue(XmlSchemaType.GetBuiltInSimpleType(XmlTypeCode.Decimal), value));

            return ChangeTypeWildcardSource(value, destinationType, null);
        }

        public override object ChangeType(double value, Type destinationType)
        {
            if (destinationType == null) throw new ArgumentNullException(nameof(destinationType));

            if (destinationType == ObjectType) destinationType = DefaultClrType;
            if (destinationType == XmlAtomicValueType) return (new XmlAtomicValue(XmlSchemaType.GetBuiltInSimpleType(XmlTypeCode.Double), (double)value));

            return ChangeTypeWildcardSource(value, destinationType, null);
        }

        public override object ChangeType(int value, Type destinationType)
        {
            if (destinationType == null) throw new ArgumentNullException(nameof(destinationType));

            if (destinationType == ObjectType) destinationType = DefaultClrType;
            if (destinationType == XmlAtomicValueType) return (new XmlAtomicValue(XmlSchemaType.GetBuiltInSimpleType(XmlTypeCode.Int), (int)value));

            return ChangeTypeWildcardSource(value, destinationType, null);
        }

        public override object ChangeType(long value, Type destinationType)
        {
            if (destinationType == null) throw new ArgumentNullException(nameof(destinationType));

            if (destinationType == ObjectType) destinationType = DefaultClrType;
            if (destinationType == XmlAtomicValueType) return (new XmlAtomicValue(XmlSchemaType.GetBuiltInSimpleType(XmlTypeCode.Long), (long)value));

            return ChangeTypeWildcardSource(value, destinationType, null);
        }

        public override object ChangeType(string value, Type destinationType, IXmlNamespaceResolver nsResolver)
        {
            if (value == null) throw new ArgumentNullException(nameof(value));
            if (destinationType == null) throw new ArgumentNullException(nameof(destinationType));

            if (destinationType == ObjectType) destinationType = DefaultClrType;
            if (destinationType == XmlAtomicValueType) return (new XmlAtomicValue(XmlSchemaType.GetBuiltInSimpleType(XmlTypeCode.String), (string)value));

            return ChangeTypeWildcardSource(value, destinationType, nsResolver);
        }

        public override object ChangeType(object value, Type destinationType, IXmlNamespaceResolver nsResolver)
        {
            if (value == null) throw new ArgumentNullException(nameof(value));
            if (destinationType == null) throw new ArgumentNullException(nameof(destinationType));

            Type sourceType = value.GetType();

            if (destinationType == ObjectType) destinationType = DefaultClrType;
            if (destinationType == BooleanType)
            {
                if (sourceType == XmlAtomicValueType) return ((XmlAtomicValue)value).ValueAsBoolean;
            }
            if (destinationType == DateTimeType)
            {
                if (sourceType == XmlAtomicValueType) return ((XmlAtomicValue)value).ValueAsDateTime;
            }
            if (destinationType == DateTimeOffsetType)
            {
                if (sourceType == XmlAtomicValueType) return ((XmlAtomicValue)value).ValueAs(DateTimeOffsetType);
            }
            if (destinationType == DecimalType)
            {
                if (sourceType == XmlAtomicValueType) return ((decimal)((XmlAtomicValue)value).ValueAs(DecimalType));
            }
            if (destinationType == DoubleType)
            {
                if (sourceType == XmlAtomicValueType) return ((XmlAtomicValue)value).ValueAsDouble;
            }
            if (destinationType == Int32Type)
            {
                if (sourceType == XmlAtomicValueType) return ((XmlAtomicValue)value).ValueAsInt;
            }
            if (destinationType == Int64Type)
            {
                if (sourceType == XmlAtomicValueType) return ((XmlAtomicValue)value).ValueAsLong;
            }
            if (destinationType == SingleType)
            {
                if (sourceType == XmlAtomicValueType) return ((float)((XmlAtomicValue)value).ValueAs(SingleType));
            }
            if (destinationType == XmlAtomicValueType)
            {
                if (sourceType == XmlAtomicValueType) return ((XmlAtomicValue)value);
                if (sourceType == BooleanType) return (new XmlAtomicValue(XmlSchemaType.GetBuiltInSimpleType(XmlTypeCode.Boolean), (bool)value));
                if (sourceType == ByteType) return (new XmlAtomicValue(XmlSchemaType.GetBuiltInSimpleType(XmlTypeCode.UnsignedByte), value));
                if (sourceType == ByteArrayType) return (new XmlAtomicValue(XmlSchemaType.GetBuiltInSimpleType(XmlTypeCode.Base64Binary), value));
                if (sourceType == DateTimeType) return (new XmlAtomicValue(XmlSchemaType.GetBuiltInSimpleType(XmlTypeCode.DateTime), (DateTime)value));
                if (sourceType == DateTimeOffsetType) return (new XmlAtomicValue(XmlSchemaType.GetBuiltInSimpleType(XmlTypeCode.DateTime), (DateTimeOffset)value));
                if (sourceType == DecimalType) return (new XmlAtomicValue(XmlSchemaType.GetBuiltInSimpleType(XmlTypeCode.Decimal), value));
                if (sourceType == DoubleType) return (new XmlAtomicValue(XmlSchemaType.GetBuiltInSimpleType(XmlTypeCode.Double), (double)value));
                if (sourceType == Int16Type) return (new XmlAtomicValue(XmlSchemaType.GetBuiltInSimpleType(XmlTypeCode.Short), value));
                if (sourceType == Int32Type) return (new XmlAtomicValue(XmlSchemaType.GetBuiltInSimpleType(XmlTypeCode.Int), (int)value));
                if (sourceType == Int64Type) return (new XmlAtomicValue(XmlSchemaType.GetBuiltInSimpleType(XmlTypeCode.Long), (long)value));
                if (sourceType == SByteType) return (new XmlAtomicValue(XmlSchemaType.GetBuiltInSimpleType(XmlTypeCode.Byte), value));
                if (sourceType == SingleType) return (new XmlAtomicValue(XmlSchemaType.GetBuiltInSimpleType(XmlTypeCode.Float), value));
                if (sourceType == StringType) return (new XmlAtomicValue(XmlSchemaType.GetBuiltInSimpleType(XmlTypeCode.String), (string)value));
                if (sourceType == TimeSpanType) return (new XmlAtomicValue(XmlSchemaType.GetBuiltInSimpleType(XmlTypeCode.Duration), value));
                if (sourceType == UInt16Type) return (new XmlAtomicValue(XmlSchemaType.GetBuiltInSimpleType(XmlTypeCode.UnsignedShort), value));
                if (sourceType == UInt32Type) return (new XmlAtomicValue(XmlSchemaType.GetBuiltInSimpleType(XmlTypeCode.UnsignedInt), value));
                if (sourceType == UInt64Type) return (new XmlAtomicValue(XmlSchemaType.GetBuiltInSimpleType(XmlTypeCode.UnsignedLong), value));
                if (IsDerivedFrom(sourceType, UriType)) return (new XmlAtomicValue(XmlSchemaType.GetBuiltInSimpleType(XmlTypeCode.AnyUri), value));
                if (IsDerivedFrom(sourceType, XmlQualifiedNameType)) return (new XmlAtomicValue(XmlSchemaType.GetBuiltInSimpleType(XmlTypeCode.QName), value, nsResolver));
            }
            if (destinationType == XPathItemType)
            {
                if (sourceType == XmlAtomicValueType) return ((XmlAtomicValue)value);
                if (IsDerivedFrom(sourceType, XPathNavigatorType)) return ((XPathNavigator)value);
            }
            if (destinationType == XPathNavigatorType)
            {
                if (IsDerivedFrom(sourceType, XPathNavigatorType)) return ToNavigator((XPathNavigator)value);
            }
            if (destinationType == XPathItemType) return ((XPathItem)this.ChangeType(value, XmlAtomicValueType, nsResolver));
            if (sourceType == XmlAtomicValueType) return ((XmlAtomicValue)value).ValueAs(destinationType, nsResolver);

            return ChangeListType(value, destinationType, nsResolver);
        }


        //-----------------------------------------------
        // Helpers
        //-----------------------------------------------

        private object ChangeTypeWildcardDestination(object value, Type destinationType, IXmlNamespaceResolver nsResolver)
        {
            Type sourceType = value.GetType();

            if (sourceType == XmlAtomicValueType) return ((XmlAtomicValue)value).ValueAs(destinationType, nsResolver);

            return ChangeListType(value, destinationType, nsResolver);
        }
        private object ChangeTypeWildcardSource(object value, Type destinationType, IXmlNamespaceResolver nsResolver)
        {
            if (destinationType == XPathItemType) return ((XPathItem)this.ChangeType(value, XmlAtomicValueType, nsResolver));

            return ChangeListType(value, destinationType, nsResolver);
        }
        #endregion

        /// <summary>
        /// Throw an exception if nodes are not allowed by this converter.
        /// </summary>
        private XPathNavigator ToNavigator(XPathNavigator nav)
        {
            if (TypeCode != XmlTypeCode.Item)
                throw CreateInvalidClrMappingException(XPathNavigatorType, XPathNavigatorType);

            return nav;
        }
    }

    internal class XmlAnyListConverter : XmlListConverter
    {
        protected XmlAnyListConverter(XmlBaseConverter atomicConverter) : base(atomicConverter)
        {
        }

        public static readonly XmlValueConverter ItemList = new XmlAnyListConverter((XmlBaseConverter)XmlAnyConverter.Item);
        public static readonly XmlValueConverter AnyAtomicList = new XmlAnyListConverter((XmlBaseConverter)XmlAnyConverter.AnyAtomic);


        //-----------------------------------------------
        // ChangeType
        //-----------------------------------------------

        public override object ChangeType(object value, Type destinationType, IXmlNamespaceResolver nsResolver)
        {
            if (value == null) throw new ArgumentNullException(nameof(value));
            if (destinationType == null) throw new ArgumentNullException(nameof(destinationType));

            // If source value does not implement IEnumerable, or it is a string or byte[],
            if (!(value is IEnumerable) || value.GetType() == StringType || value.GetType() == ByteArrayType)
            {
                // Then create a list from it
                value = new object[] { value };
            }

            return ChangeListType(value, destinationType, nsResolver);
        }
    }

    internal class XmlListConverter : XmlBaseConverter
    {
        protected XmlValueConverter atomicConverter;

        protected XmlListConverter(XmlBaseConverter atomicConverter) : base(atomicConverter)
        {
            this.atomicConverter = atomicConverter;
        }

        protected XmlListConverter(XmlBaseConverter atomicConverter, Type clrTypeDefault) : base(atomicConverter, clrTypeDefault)
        {
            this.atomicConverter = atomicConverter;
        }

        protected XmlListConverter(XmlSchemaType schemaType) : base(schemaType)
        {
        }

        public static XmlValueConverter Create(XmlValueConverter atomicConverter)
        {
            if (atomicConverter == XmlUntypedConverter.Untyped)
                return XmlUntypedConverter.UntypedList;

            if (atomicConverter == XmlAnyConverter.Item)
                return XmlAnyListConverter.ItemList;

            if (atomicConverter == XmlAnyConverter.AnyAtomic)
                return XmlAnyListConverter.AnyAtomicList;

            Debug.Assert(!(atomicConverter is XmlListConverter) || ((XmlListConverter)atomicConverter).atomicConverter == null,
                         "List converters should not be nested within one another.");

            return new XmlListConverter((XmlBaseConverter)atomicConverter);
        }


        //-----------------------------------------------
        // ChangeType
        //-----------------------------------------------

        public override object ChangeType(object value, Type destinationType, IXmlNamespaceResolver nsResolver)
        {
            if (value == null) throw new ArgumentNullException(nameof(value));
            if (destinationType == null) throw new ArgumentNullException(nameof(destinationType));

            return ChangeListType(value, destinationType, nsResolver);
        }


        //------------------------------------------------------------------------
        // Helpers
        //------------------------------------------------------------------------

        protected override object ChangeListType(object value, Type destinationType, IXmlNamespaceResolver nsResolver)
        {
            Type sourceType = value.GetType();

            if (destinationType == ObjectType) destinationType = DefaultClrType;

            // Input value must support IEnumerable and destination type should be IEnumerable, ICollection, IList, Type[], or String
            if (!(value is IEnumerable) || !IsListType(destinationType))
                throw CreateInvalidClrMappingException(sourceType, destinationType);

            // Handle case where destination type is a string
            if (destinationType == StringType)
            {
                // Conversion from string to string is a no-op
                if (sourceType == StringType)
                    return value;

                // Convert from list to string
                return ListAsString((IEnumerable)value, nsResolver);
            }

            // Handle case where source type is a string
            // Tokenize string and create a list out of resulting string tokens
            if (sourceType == StringType)
                value = StringAsList((string)value);

            if (destinationType.IsArray)
            {
                // Convert from source value to strongly-typed array; special-case each possible item type for performance
                Type itemTypeDst = destinationType.GetElementType();

                // Converting from object[] to object[] is not necessarily a no-op (i.e. xs:int* stored as an object[]
                // containing String values will need to be converted to an object[] containing Int32 values).
                if (itemTypeDst == ObjectType) return ToArray<object>(value, nsResolver);

                // For all types except object[], sourceType = destinationType is a no-op conversion
                if (sourceType == destinationType) return value;

                // Otherwise, iterate over values in source list, convert them to output item type, and store them in result array
                if (itemTypeDst == BooleanType) return ToArray<bool>(value, nsResolver);
                if (itemTypeDst == ByteType) return ToArray<byte>(value, nsResolver);
                if (itemTypeDst == ByteArrayType) return ToArray<byte[]>(value, nsResolver);
                if (itemTypeDst == DateTimeType) return ToArray<DateTime>(value, nsResolver);
                if (itemTypeDst == DateTimeOffsetType) return ToArray<DateTimeOffset>(value, nsResolver);
                if (itemTypeDst == DecimalType) return ToArray<decimal>(value, nsResolver);
                if (itemTypeDst == DoubleType) return ToArray<double>(value, nsResolver);
                if (itemTypeDst == Int16Type) return ToArray<short>(value, nsResolver);
                if (itemTypeDst == Int32Type) return ToArray<int>(value, nsResolver);
                if (itemTypeDst == Int64Type) return ToArray<long>(value, nsResolver);
                if (itemTypeDst == SByteType) return ToArray<sbyte>(value, nsResolver);
                if (itemTypeDst == SingleType) return ToArray<float>(value, nsResolver);
                if (itemTypeDst == StringType) return ToArray<string>(value, nsResolver);
                if (itemTypeDst == TimeSpanType) return ToArray<TimeSpan>(value, nsResolver);
                if (itemTypeDst == UInt16Type) return ToArray<ushort>(value, nsResolver);
                if (itemTypeDst == UInt32Type) return ToArray<uint>(value, nsResolver);
                if (itemTypeDst == UInt64Type) return ToArray<ulong>(value, nsResolver);
                if (itemTypeDst == UriType) return ToArray<Uri>(value, nsResolver);
                if (itemTypeDst == XmlAtomicValueType) return ToArray<XmlAtomicValue>(value, nsResolver);
                if (itemTypeDst == XmlQualifiedNameType) return ToArray<XmlQualifiedName>(value, nsResolver);
                if (itemTypeDst == XPathItemType) return ToArray<XPathItem>(value, nsResolver);
                if (itemTypeDst == XPathNavigatorType) return ToArray<XPathNavigator>(value, nsResolver);

                throw CreateInvalidClrMappingException(sourceType, destinationType);
            }

            // Destination type is IList, ICollection or IEnumerable
            // If source value is an array of values having the default representation, then conversion is a no-op
            if (sourceType == DefaultClrType && sourceType != ObjectArrayType)
                return value;

            return ToList(value, nsResolver);
        }

        /// <summary>
        /// Return true if "type" is one of the following:
        ///   1. IList, ICollection, IEnumerable
        ///   2. A strongly-typed array
        ///   3. A string
        /// </summary>
        private bool IsListType(Type type)
        {
            // IsClrListType returns true if "type" is one of the list interfaces
            if (type == IListType || type == ICollectionType || type == IEnumerableType || type == StringType)
                return true;

            return type.IsArray;
        }

        /// <summary>
        /// Convert "list" to an array of type T by iterating over each item in "list" and converting it to type "T"
        /// by invoking the atomic converter.
        /// </summary>
        private T[] ToArray<T>(object list, IXmlNamespaceResolver nsResolver)
        {
            // IList --> Array<T>
            IList listSrc = list as IList;
            if (listSrc != null)
            {
                T[] arrDst = new T[listSrc.Count];

                for (int i = 0; i < listSrc.Count; i++)
                    arrDst[i] = (T)this.atomicConverter.ChangeType(listSrc[i], typeof(T), nsResolver);

                return arrDst;
            }

            // IEnumerable --> Array<T>
            IEnumerable enumSrc = list as IEnumerable;
            Debug.Assert(enumSrc != null, "Value passed to ToArray must implement IEnumerable");

            List<T> listDst = new List<T>();
            foreach (object value in enumSrc)
                listDst.Add((T)this.atomicConverter.ChangeType(value, typeof(T), nsResolver));

            return listDst.ToArray();
        }

        /// <summary>
        /// Convert "list" to an IList containing items in the atomic type's default representation.
        /// </summary>
        private IList ToList(object list, IXmlNamespaceResolver nsResolver)
        {
            // IList --> object[]
            IList listSrc = list as IList;
            if (listSrc != null)
            {
                object[] arrDst = new object[listSrc.Count];

                for (int i = 0; i < listSrc.Count; i++)
                    arrDst[i] = this.atomicConverter.ChangeType(listSrc[i], ObjectType, nsResolver);

                return arrDst;
            }

            // IEnumerable --> List<object>
            IEnumerable enumSrc = list as IEnumerable;
            Debug.Assert(enumSrc != null, "Value passed to ToArray must implement IEnumerable");

            List<object> listDst = new List<object>();
            foreach (object value in enumSrc)
                listDst.Add(this.atomicConverter.ChangeType(value, ObjectType, nsResolver));

            return listDst;
        }

        /// <summary>
        /// Tokenize "value" by splitting it on whitespace characters.  Insert tokens into an ArrayList and return the list.
        /// </summary>
        private List<string> StringAsList(string value)
        {
            return new List<string>(XmlConvert.SplitString(value));
        }

        /// <summary>
        /// Convert a list to a corresponding list of strings.  Then concatenate the strings, which adjacent values delimited
        /// by a space character.
        /// </summary>
        private string ListAsString(IEnumerable list, IXmlNamespaceResolver nsResolver)
        {
            StringBuilder bldr = new StringBuilder();

            foreach (object value in list)
            {
                // skip null values
                if (value != null)
                {
                    // Separate values by single space character
                    if (bldr.Length != 0)
                        bldr.Append(' ');

                    // Append string value of next item in the list
                    bldr.Append(this.atomicConverter.ToString(value, nsResolver));
                }
            }

            return bldr.ToString();
        }

        /// <summary>
        /// Create an InvalidCastException for cases where either "destinationType" or "sourceType" is not a supported CLR representation
        /// for this Xml type.
        /// </summary>
        private new Exception CreateInvalidClrMappingException(Type sourceType, Type destinationType)
        {
            if (sourceType == destinationType)
                return new InvalidCastException(SR.Format(SR.XmlConvert_TypeListBadMapping, XmlTypeName, sourceType.Name));

            return new InvalidCastException(SR.Format(SR.XmlConvert_TypeListBadMapping2, XmlTypeName, sourceType.Name, destinationType.Name));
        }
    }

    internal class XmlUnionConverter : XmlBaseConverter
    {
        private XmlValueConverter[] _converters;
        private bool _hasAtomicMember, _hasListMember;

        protected XmlUnionConverter(XmlSchemaType schemaType) : base(schemaType)
        {
            // Skip restrictions. It is safe to do that because this is a union, so it's not a built-in type 
            while (schemaType.DerivedBy == XmlSchemaDerivationMethod.Restriction)
                schemaType = schemaType.BaseXmlSchemaType;

            // Get a converter for each member type in the union
            Debug.Assert(schemaType.DerivedBy == XmlSchemaDerivationMethod.Union);
            XmlSchemaSimpleType[] memberTypes = ((XmlSchemaSimpleTypeUnion)((XmlSchemaSimpleType)schemaType).Content).BaseMemberTypes;

            _converters = new XmlValueConverter[memberTypes.Length];
            for (int i = 0; i < memberTypes.Length; i++)
            {
                _converters[i] = memberTypes[i].ValueConverter;

                // Track whether this union's member types include a list type
                if (memberTypes[i].Datatype.Variety == XmlSchemaDatatypeVariety.List)
                    _hasListMember = true;
                else if (memberTypes[i].Datatype.Variety == XmlSchemaDatatypeVariety.Atomic)
                    _hasAtomicMember = true;
            }
        }

        public static XmlValueConverter Create(XmlSchemaType schemaType)
        {
            return new XmlUnionConverter(schemaType);
        }


        //-----------------------------------------------
        // ChangeType
        //-----------------------------------------------

        public override object ChangeType(object value, Type destinationType, IXmlNamespaceResolver nsResolver)
        {
            if (value == null) throw new ArgumentNullException(nameof(value));
            if (destinationType == null) throw new ArgumentNullException(nameof(destinationType));

            Type sourceType = value.GetType();

            // If source value is an XmlAtomicValue, then allow it to perform the conversion
            if (sourceType == XmlAtomicValueType && _hasAtomicMember)
                return ((XmlAtomicValue)value).ValueAs(destinationType, nsResolver);

            // If source value is an XmlAtomicValue[], then use item* converter
            if (sourceType == XmlAtomicValueArrayType && _hasListMember)
                return XmlAnyListConverter.ItemList.ChangeType(value, destinationType, nsResolver);

            // If source value is a string, then validate the string in order to determine the member type
            if (sourceType == StringType)
            {
                if (destinationType == StringType) return value;

                XsdSimpleValue simpleValue = (XsdSimpleValue)SchemaType.Datatype.ParseValue((string)value, new NameTable(), nsResolver, true);

                // Allow the member type to perform the conversion
                return simpleValue.XmlType.ValueConverter.ChangeType((string)value, destinationType, nsResolver);
            }

            throw CreateInvalidClrMappingException(sourceType, destinationType);
        }
    }
}
