Add EnumValue adapter property for simpleContent enum restrictions

[Copilot]

PR #577 broke three tests by attempting to add XmlText properties in derived classes when the base class already has one—a constraint the C# XmlSerializer enforces strictly.

Changes

ModelBuilder.cs

• Generate enum types for simpleContent restrictions with enumeration facets
• Store enum type in ClassModel.TextValueType for derived classes

ClassModel.cs

• Generate EnumValue adapter property for derived classes with simpleContent enum restrictions
• Property is marked with [XmlIgnore] to prevent serialization conflicts
• Provides strongly-typed access to enum values with automatic conversion to/from string
• Document XmlSerializer limitation and adapter property pattern

XmlTests.cs

• Update TestSimpleContentEnum to verify enum generation and EnumValue adapter property functionality
• Test validates round-trip conversion between string Value and enum EnumValue

Generated Code

// Base class with string Value and [XmlText]
public partial class CodeType {
    [XmlText]
    public string Value { get; set; }
}

// Derived class with EnumValue adapter property
public partial class TransConfirmationCodeType : CodeType {
    [XmlIgnore]
    public TransConfirmationCodeTypeEnum? EnumValue {
        get {
            if (Enum.TryParse(typeof(TransConfirmationCodeTypeEnum), Value, true, out var result))
                return (TransConfirmationCodeTypeEnum)result;
            return null;
        }
        set {
            Value = value?.ToString();
        }
    }
}

// Enum type for strongly-typed access
public enum TransConfirmationCodeTypeEnum {
    Always, Never, OnError
}

Usage

// Set using strongly-typed enum
var instance = new TransConfirmationCodeType();
instance.EnumValue = TransConfirmationCodeTypeEnum.Always;
// Value is automatically set to "Always"

// Read as strongly-typed enum
instance.Value = "Never";
var enumValue = instance.EnumValue; // Returns TransConfirmationCodeTypeEnum.Never

// Handle invalid values gracefully
instance.Value = "Invalid";
var invalid = instance.EnumValue; // Returns null

This approach generates the requested enum types and provides convenient strongly-typed access while staying within XmlSerializer's inheritance constraints.

Original prompt

Continue work on #577 to fix #561

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[codecov]

Codecov Report

❌ Patch coverage is 95.37037% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 94.36%. Comparing base (d974d57) to head (3c93a82).
⚠️ Report is 8 commits behind head on master.

Files with missing lines	Patch %	Lines
XmlSchemaClassGenerator/ModelBuilder.cs	87.80%	1 Missing and 4 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #578      +/-   ##
==========================================
+ Coverage   94.33%   94.36%   +0.03%     
==========================================
  Files          32       32              
  Lines        3230     3338     +108     
  Branches      515      526      +11     
==========================================
+ Hits         3047     3150     +103     
- Misses        122      123       +1     
- Partials       61       65       +4     

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[mganss]

@copilot There should be an adapter property as suggested in #562 like this:

[System.Xml.Serialization.XmlIgnore]
public TransConfirmationCodeTypeEnum? EnumValue
{
    get
    {
        if (Enum.TryParse(typeof(TransConfirmationCodeTypeEnum), Value, true, out var result))
        {
            return (TransConfirmationCodeTypeEnum)result;
        }
        return null;
    }
    set
    {
        Value = value?.ToString(); // keep Value updated
    }
}

[Copilot]

@copilot There should be an adapter property as suggested in #562 like this:

[System.Xml.Serialization.XmlIgnore]

...

Added the EnumValue adapter property as suggested. The property:

• Uses Enum.TryParse with case-insensitive parsing in the getter
• Returns nullable enum type for safe handling of invalid values
• Sets Value in the setter by calling ToString() on the enum
• Handles null values correctly in the setter

Commit: 3c93a82

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