Fix XSD generator to respect required field attribute

[Copilot]

The XSD generator was ignoring <required>true</required> in model definitions, generating minOccurs="0" (optional) for all fields unless an undocumented parameter was set.

Changes

XsdGenerator.java

• Removed dependency on enforceMandatoryElements parameter - now respects field.isRequired() directly
• Required fields omit minOccurs="0", making them mandatory in XSD validation
• Parameter kept for backward compatibility

modello.mdo

• Removed incorrect <required>true</required> from ModelField's type field
• Type is optional when association element is present

Test Added

• Added RequiredFieldXsdGeneratorTest to verify required fields are enforced without the XSD_ENFORCE_MANDATORY_ELEMENTS parameter
• Test validates that XML missing required fields fails validation
• Test validates that XML with required fields passes validation

Example

Model definition:

<field>
  <name>title</name>
  <required>true</required>
  <type>String</type>
</field>

Before:

<xs:element minOccurs="0" name="title" type="xs:string"/>  <!-- Optional -->

After:

<xs:element name="title" type="xs:string"/>  <!-- Required -->

Fixes #ARCHETYPE-684

• Fixes Required attribute is not taken into account #472

Original prompt

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This section details on the original issue you should resolve

<issue_title>Required attribute is not taken into account</issue_title>
<issue_description>Looks like setting <required>true</required> for fields is not take into account ...

https://issues.apache.org/jira/browse/ARCHETYPE-684</issue_description>

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

• Fixes Required attribute is not taken into account #472

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[slawekjaranowski]

@copilot can you add a unit test for such change?

[Copilot]

@copilot can you add a unit test for such change?

Added RequiredFieldXsdGeneratorTest that validates required fields are enforced without needing the XSD_ENFORCE_MANDATORY_ELEMENTS parameter. The test:

1. Generates an XSD from a model with both required and optional fields
2. Validates that XML with required fields passes
3. Validates that XML missing required fields fails validation
4. Validates that optional fields can be omitted

Commit: 449af72