XML: Diff, Merge, and Advanced Validation (High Priority)

[jwesleye]

XML Diff and Merge

• XML comparison: Compare two XML documents for differences
• Diff reporting: Generate human-readable diff reports
• XML merging: Merge multiple XML documents intelligently
• Conflict resolution: Handle merge conflicts with strategies
• Patch generation: Create and apply XML patches

Advanced Validation

• RelaxNG validation: Support RelaxNG schema validation
• Schematron validation: Business rule validation with Schematron
• Custom validators: Define custom validation rules
• Validation error recovery: Suggest fixes for common validation errors
• Multi-schema validation: Validate against multiple schemas

XML Templating

• Template substitution: Variable substitution in XML templates
• Conditional sections: Include/exclude XML sections based on conditions
• Loop generation: Generate repeated XML structures from data
• Template inheritance: XML template extension and composition
• Safe rendering: Prevent injection in template substitution

Namespace Management

• Namespace registration: Register and manage namespace prefixes
• Namespace resolution: Resolve namespaced elements and attributes
• Namespace normalization: Standardize namespace usage
• Prefix management: Add/remove/modify namespace prefixes
• Default namespace handling: Manage default namespace declarations

Source: src/basic_open_agent_tools/xml/TODO.md
Module: XML
Priority: High