Generate enums for simpleContent complex types with enumeration facets

[Copilot]

The generator produced enums for simpleType restrictions but emitted empty classes for complexTypes with simpleContent restrictions containing enumeration facets (e.g., TransConfirmationCodeType). This left derived code types without typed enum values.

• ModelBuilder: Detect simpleContent restrictions with enumeration facets, synthesize an enum type, and record it as the text value type for the owning class.
• ClassModel: Emit an XmlText-backed property (with new modifier) using the synthesized enum, so the derived class exposes a strongly typed value rather than a raw string.
• Tests & fixture: Added a minimal schema (simplecontent-enum.xsd) and regression test ensuring a complexType restriction generates the enum and binds it to the value property.

Example:

// Generated
[XmlType("TransConfirmationCodeType", Namespace="http://example.com/simplecontent")]
public partial class TransConfirmationCodeType : CodeType
{
    [XmlText]
    public TransConfirmationCodeTypeEnum Value { get; set; }
}

public enum TransConfirmationCodeTypeEnum
{
    Always,
    Never,
    OnError
}

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Original prompt

---

This section details on the original issue you should resolve

<issue_title>Enum generated correctly only for simple types, not generated at all for complex types</issue_title>
<issue_description>The xsd files from this example define enumeration restrictions for simpleType and also for complexType elements.
These enumerations for simpleType are generated correctly as C# enum:

<xsd:simpleType name = "TransResponseCodeType">
        <xsd:restriction base="xsd:normalizedString">
                <xsd:enumeration value="Always"/>
                <xsd:enumeration value="OnError"/>
        </xsd:restriction>
</xsd:simpleType>

<xsd:simpleType name = "TransActionCodeEnumerationType">
        <xsd:restriction base="xsd:string">
                <xsd:enumeration value="Add"/>
                <xsd:enumeration value="Change"/>
                <xsd:enumeration value="Delete"/>
                <xsd:enumeration value="Replaced"/>
                <xsd:enumeration value="Accepted"/>
                <xsd:enumeration value="Modified"/>
                <xsd:enumeration value="Rejected"/>
        </xsd:restriction>
</xsd:simpleType>

Generated c# code:

    [System.CodeDom.Compiler.GeneratedCodeAttribute("XmlSchemaClassGenerator", "2.1.1184.0")]
    [System.SerializableAttribute()]
    [System.Xml.Serialization.XmlTypeAttribute("TransResponseCodeType", Namespace="http://www.wbf.org/xml/B2MML-V0401")]
    public enum TransResponseCodeType
    {        
        Always,        
        OnError,
    }

    [System.CodeDom.Compiler.GeneratedCodeAttribute("XmlSchemaClassGenerator", "2.1.1184.0")]
    [System.SerializableAttribute()]
    [System.Xml.Serialization.XmlTypeAttribute("TransActionCodeEnumerationType", Namespace="http://www.wbf.org/xml/B2MML-V0401")]
    public enum TransActionCodeEnumerationType
    {        
        Add,        
        Change,        
        Delete,        
        Replaced,        
        Accepted,        
        Modified,        
        Rejected,
    }

This enumeration for complexType is not generated correctly as C# enum:

<xsd:complexType name = "TransConfirmationCodeType">
  <xsd:simpleContent>
        <xsd:restriction base="CodeType">
                <xsd:enumeration value="Always"/>
                <xsd:enumeration value="Never"/>
                <xsd:enumeration value="OnError"/>
        </xsd:restriction>
  </xsd:simpleContent>
</xsd:complexType>

Generated c# code is just empty class:

    [System.CodeDom.Compiler.GeneratedCodeAttribute("XmlSchemaClassGenerator", "2.1.1184.0")]
    [System.SerializableAttribute()]
    [System.Xml.Serialization.XmlTypeAttribute("TransConfirmationCodeType", Namespace="http://www.wbf.org/xml/B2MML-V0401")]
    [System.ComponentModel.DesignerCategoryAttribute("code")]
    public partial class TransConfirmationCodeType : MyData.CodeType
    {
    }

This is the CodeType definition in the xsd schema file

<!--  ****************************************    -->
<!--  CodeType used for any enumerated strings    -->
<!--  ****************************************    -->
    <xsd:complexType name="CodeType">
        <xsd:simpleContent>
            <xsd:extension base="xsd:normalizedString">
                <xsd:attribute name="listID"            type="xsd:normalizedString" use="optional" />
                <xsd:attribute name="listAgencyID"      type="xsd:normalizedString" use="optional" />
                <xsd:attribute name="listAgencyName"    type="xsd:string"           use="optional" />
                <xsd:attribute name="listName"          type="xsd:string"           use="optional" />
                <xsd:attribute name="listVersionID"     type="xsd:normalizedString" use="optional" />
                <xsd:attribute name="name"              type="xsd:string"           use="optional" />
                <xsd:attribute name="languageID"        type="xsd:language"         use="optional" />
                <xsd:attribute name="listURI"           type="xsd:anyURI"           use="optional" />
                <xsd:attribute name="listSchemeURI"     type="xsd:anyURI"           use="optional" />
            </xsd:extension>
        </xsd:simpleContent>
    </xsd:complexType>

This is how the generated C# code could more or less look like:

public enum TransConfirmationCodeEnum
{
    Always,
    Never,
    OnError
}

public class TransConfirmationCodeType : CodeType
{
    [XmlIgnore]
    public new string Value
    {
        get => EnumValue.ToString();
        set => EnumValue = Enum.Parse<TransConfirmationCodeEnum>(value, ignoreCase: true);
    }

    [XmlText]
    public TransConfirmationCodeEnum EnumValue { get; set; }
}
```</issue_description>

## Comments on the Issue (you are @copilot in this section)

<comments>
<comment_new><author>@mganss</author><body>
@AdmiralSnyder Would you be up for creating a PR?</body></comment_new>
</comments>


</details>



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- Fixes mganss/XmlSchemaClassGenerator#561

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.33%. Comparing base (d974d57) to head (0823f9a).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #577   +/-   ##
=======================================
  Coverage   94.33%   94.33%           
=======================================
  Files          32       32           
  Lines        3230     3230           
  Branches      515      515           
=======================================
  Hits         3047     3047           
  Misses        122      122           
  Partials       61       61           

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[mganss]

@copilot Your changes made other unit tests fail.

[Copilot]

@copilot Your changes made other unit tests fail.

I’ll investigate and address the failing tests. Could you share which test cases are failing in your run so I can reproduce them quickly?

[mganss]

@copilot

• AirspaceServicesTest1
• TestEmptyKeyProviderGeneratorPrefix
• TestSimple

[mganss]

@copilot - AirspaceServicesTest1

• TestEmptyKeyProviderGeneratorPrefix
• TestSimple

[mganss]

@copilot Start new session

[Copilot]

@copilot Start new session

Starting a fresh session now and will investigate the failing tests you listed (AirspaceServicesTest1, TestEmptyKeyProviderGeneratorPrefix, TestSimple).