[WIP] Add JSON Structure to XSD conversion

[Copilot]

• Understand the existing patterns from avrotoxsd.py, structuretocsharp.py, and structuretopython.py
• Create structuretoxsd.py module with JSON Structure to XSD conversion
• Support all JSON Structure Core primitive types (string, number, boolean, null, binary, int8-128, uint8-128, float/double, decimal, date, datetime, time, duration, uuid, uri, jsonpointer)
• Support compound types (object, array, set, map, tuple, any, choice)
• Support JSON Structure-specific features (namespaces, $ref, $extends, abstract types, required/optional properties, annotations)
• Add CLI command in commands.json for structuretoxsd (s2x)
• Create tests following the pattern of test_avrotoxsd.py
• Validate implementation with test cases

Original prompt

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This section details on the original issue you should resolve

<issue_title>Add structuretoxsd: JSON Structure to XSD conversion</issue_title>
<issue_description>## Overview
Implement conversion from JSON Structure schemas to XML Schema Definition (XSD).

Requirements

This conversion should:

1. Lean on the corresponding Avro conversion (avrotoxsd) as precedent for output structure, including use of Jinja templates where applicable
2. Cover the full breadth of the JSON Structure Core spec as defined in draft-vasters-json-structure-core-00
3. Follow the patterns established by structuretocsharp and structuretopython, including their continued support for Avro schemas

Implementation Guidance

• Review avrotize/avrotoxsd.py for output patterns and template usage
• Review avrotize/structuretocsharp.py and avrotize/structuretopython.py for the JSON Structure handling patterns
• Ensure all JSON Structure Core types are supported:
  • JSON Primitive Types: string, number, boolean, null
  • Extended Primitive Types: binary, int8-128, uint8-128, float8/float/double, decimal, date, datetime, time, duration, uuid, uri, jsonpointer
  • Compound Types: object, array, set, map, tuple, any, choice (both tagged and inline unions)
• Support JSON Structure-specific features:
  • Namespaces and definitions
  • Type references ($ref)
  • Extensions ($extends) and add-ins ($offers/$uses)
  • Abstract types
  • Required/optional properties
  • Type annotations (maxLength, precision, scale, contentEncoding, etc.)

References

• JSON Structure Core Spec: https://www.ietf.org/archive/id/draft-vasters-json-structure-core-00.txt
• Avro precedent: avrotize/avrotoxsd.py
• JSON Structure precedents: avrotize/structuretocsharp.py, avrotize/structuretopython.py
  </issue_description>

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

• Fixes Add structuretoxsd: JSON Structure to XSD conversion #52

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[clemensv]

@copilot

Additional Requirements

Documentation

The README.md file needs to be updated to include documentation for this new conversion feature, following the pattern established for existing conversions.

Testing

All tests must follow the established testing patterns:

• For programming language outputs (C#, Java, Python, TypeScript, JavaScript, C++, Go, Rust): Tests must run the embedded tests in the code outputs to verify correctness
• For schema language outputs (CSV, Protobuf, XSD, GraphQL, etc.): Tests must compare the generated output to a desired output reference (-ref) schema stored in the /test/struct directory

This follows the pattern established for the Avro conversion tests in the repository.

[clemensv]

Closing duplicate PR for XSD conversion. Keeping the newer PR #96 for this issue.