Create comprehensive Musoq SQL syntax documentation

[Copilot]

This PR creates comprehensive documentation for Musoq's SQL syntax and features, organized in a task-oriented structure that follows accessibility best practices and progressive disclosure principles.

Documentation Structure

The new .docs2/ directory contains a complete documentation system with:

• Complete Table of Contents (index.md) - Organized by user tasks and progressive complexity
• Core SQL Syntax Elements - SELECT, FROM, WHERE, ORDER BY, GROUP BY, and HAVING clauses
• Musoq-Specific Features - Schema syntax, table definitions, coupling, and CTEs
• Task-Oriented Organization - Content structured around what users want to accomplish
• Comprehensive Examples - Every feature includes working examples derived from unit tests

Key Features

Progressive Disclosure: Information is layered from basic concepts to advanced usage patterns, allowing users to dive deeper as needed.

Accessibility Standards: Following WCAG guidelines with proper heading hierarchy, descriptive links, and consistent terminology throughout.

Real-World Examples: All syntax examples are derived from actual repository unit tests and README content, ensuring accuracy and practical relevance.

Syntax Coverage

The documentation covers Musoq's complete SQL syntax including:

• Data Source Integration - File system (#os), Git repositories (#git), code analysis (#csharp), AI integration (#openai)
• Core SQL Operations - All standard SQL clauses with Musoq-specific extensions
• Advanced Features - Table definitions, coupling syntax, CTEs, and complex query patterns
• Type System - Comprehensive coverage of supported data types and conversions

-- Basic data source syntax
select Name, Length from #os.files('/path', true)

-- Table definitions and coupling  
table PersonTable {
    Name 'System.String',
    Age 'System.Int32'
};
couple #csv.reader with table PersonTable as PersonSource;

-- Complex analysis with CTEs
with large_files as (
    select Name, Length from #os.files('/docs', true)
    where Length > 1000000
)
select Extension, count(*) as FileCount
from large_files
group by Extension
having count(*) >= 5
order by FileCount desc;

The documentation serves as a comprehensive reference for developers wanting to leverage Musoq's powerful SQL capabilities across diverse data sources.

---

💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.

[Puchaczov]

Complete Software Documentation Style Guide

Introduction

This comprehensive style guide synthesizes best practices from leading tech companies (Google, Microsoft, Apple, Stripe), documentation experts, accessibility standards, and proven frameworks to help you create exceptional software documentation. Great documentation is a product feature, not an afterthought - it directly impacts user adoption, reduces support costs, and determines whether developers succeed with your tools.

1. Creating Easy to Read, Comprehensive Documentation

Content clarity principles

Write for your users, not yourself. Every piece of documentation should prioritize user tasks over system features. Focus on helping users accomplish goals rather than describing what your software does.

Use conversational, professional tone. Sound like a knowledgeable friend who understands what users want to achieve. Avoid marketing language in technical documentation - users need facts, not sales pitches.

Apply the progressive disclosure principle. Layer information so users can dive deeper when needed. Start with essential information, then provide detailed explanations for those who need them.

Practice radical clarity. Use simple, direct language even for complex topics. Define technical terms on first use and maintain consistent terminology throughout all documentation.

Content completeness standards

Create multiple content types to serve different user needs:

• Tutorials: Learning-oriented content for beginners
• How-to guides: Goal-oriented instructions for specific tasks
• Reference: Information-oriented comprehensive details
• Explanations: Understanding-oriented background knowledge

Cover the complete user journey from first contact to advanced usage. Include error handling, troubleshooting guides, and edge cases - not just happy path scenarios.

2. Logical Documentation Organization and Structure

Four-tier information architecture

Tier 1: Navigation structure

• Clear top-level categories based on user tasks
• Maximum 7±2 main navigation items (cognitive load management)
• Consistent labeling using action-oriented language

Tier 2: Content categorization

• Group related information together
• Use parallel structure in headings and organization
• Implement breadcrumb navigation for deep content

Tier 3: Page-level organization

• One primary topic per page where possible
• Table of contents for longer documents
• Related links and cross-references

Tier 4: Within-page structure

• Clear heading hierarchy (H1 → H2 → H3 → H4)
• Never skip heading levels
• Descriptive headings that work out of context

Content organization patterns

Task-oriented organization: Structure content around what users need to accomplish, not how your system is built internally.

Progressive complexity: Arrange information from simple to complex, with clear pathways for users to find their appropriate level.

Contextual grouping: Keep related information together and use consistent patterns across similar content types.

3. Structure and Formatting Best Practices

Heading guidelines

Use sentence case for all headings - avoid title case or all caps. Headers should be descriptive signposts that enable users to scan and understand content structure.

Write headers as complete thoughts: Instead of “API Methods,” use “Making API calls to retrieve user data.”

Create unique, distinctive headers - avoid repetitive patterns and make each header informative and engaging.

Text formatting standards

Bold formatting: Use for UI elements users can interact with, key concepts, or critical warnings. Limit to 1-3 items per section for scanability.

Code formatting: Use backticks for inline code, file names, repository names, and technical terms. Use code blocks for multi-line examples.

Lists and structure:

• Use numbered lists only for sequential instructions
• Use bulleted lists for non-sequential information
• Write substantial bullet points (minimum 5 words)
• Prefer narrative paragraphs over short bullet points

Visual hierarchy principles

Maintain consistent spacing between elements. Use white space purposefully to group related content.

Keep code samples concise - approximately 60 characters per line for readability.

Use placeholders consistently - ALL CAPS for user-replaceable values (YOUR-API-KEY).

4. Content Organization Principles

User-centered design approach

Start with user research - understand who uses your documentation, their skill levels, contexts, and goals.

Create user personas that include developers with different experience levels and users with disabilities.

Map user journeys from first contact through advanced usage scenarios.

Information layering strategy

Follow the inverted pyramid: Lead with most important information, then supporting details.

Use the BLUF principle (Bottom Line Up Front): State the key finding or answer immediately.

Provide multiple entry points for different user types and skill levels.

Content relationships

Implement strong cross-referencing between related topics without creating circular dependencies.

Create clear content hierarchies with parent-child relationships that make sense to users.

Design for non-linear access - users often arrive via search engines, not homepage navigation.

5. Writing Style Guidelines for Technical Documentation

Voice and tone standards

Active voice over passive voice - “Click the button” not “The button should be clicked.”

Second person, present tense - “You can configure settings” not “Users may configure settings.”

Conversational but professional tone - friendly and approachable without sacrificing credibility.

Language guidelines

Use simple, direct sentences - average 20 words or fewer for optimal comprehension.

Choose specific over general language - “Click Save” not “Proceed with the action.”

Avoid unnecessary hedging - “The system will display results” not “The system may possibly display results.”

Write for global audiences - avoid idioms, cultural references, and region-specific examples.

Terminology management

Create and maintain glossaries for technical terms and consistently apply terminology across all documentation.

Define abbreviations on first use and avoid unnecessary acronyms.

Use inclusive language - “allowlist” instead of “whitelist,” “main branch” instead of “master branch.”

6. Examples of Excellent Software Documentation

Stripe API Documentation

Excellence factors: Clean three-column layout, personalized code examples, interactive testing environment, plain English explanations without unnecessary complexity.

Key lesson: Simplicity and clarity trump flashy features - focus on helping users succeed quickly.

Twilio Documentation

Excellence factors: Beginner-friendly approach explaining fundamentals, comprehensive depth, educational context alongside technical reference.

Key lesson: Provide foundational knowledge - don’t assume expert-level understanding.

Vue.js Documentation

Excellence factors: Progressive learning approach, clear API comparisons, world-class organization, balanced mix of tutorials and reference material.

Key lesson: Support different learning styles and experience levels within the same documentation system.

Django Documentation

Excellence factors: Complete framework coverage, extensive community contributions, comprehensive yet accessible to newcomers.

Key lesson: Community-driven documentation can achieve both depth and accessibility.

GitHub API Documentation

Excellence factors: Clear status indicators, well-organized navigation, helpful troubleshooting widgets.

Key lesson: Save users time with contextual help and status information.

7. Common Pitfalls to Avoid

Critical documentation failures

Never hide documentation behind logins - make it publicly accessible and discoverable.

Avoid outdated information - implement regular review cycles and version control systems for documentation.

Don’t create inconsistent terminology - develop and enforce style guides across all content.

Never provide only PDF documentation - offer web-based versions with optional PDF downloads.

Content quality mistakes

Missing context and examples - always include realistic, practical examples rather than toy scenarios.

Wrong audience focus - create audience-specific paths rather than trying to serve everyone with single content.

Too much or too little detail - layer information appropriately for different user needs.

Poor visual hierarchy - include relevant screenshots, diagrams, and visual aids.

Process failures

Documentation debt - integrate documentation into development workflows, don’t treat as afterthought.

No user feedback integration - implement feedback systems and act on user input.

Lack of testing - validate documentation with actual users and peer review processes.

8. Modern Documentation Trends and Tools

Leading documentation platforms

Static site generators: Hugo (fastest builds), Docusaurus (React-based), MkDocs (Python ecosystem), VuePress (Vue.js integration).

All-in-one platforms: GitBook (Git-based workflow), Notion (collaborative workspace), Confluence (enterprise features).

API-focused tools: OpenAPI/Swagger for interactive API documentation, Postman for collection-based documentation.

Emerging technology trends

AI integration: Content generation assistance, automated summarization, intelligent search recommendations, real-time translation support.

Interactive documentation: Embedded code sandboxes, live API testing, interactive tutorials and walkthroughs.

Docs-as-code workflows: Version control integration, automated testing, continuous integration pipelines, collaborative review processes.

Modern workflow patterns

Documentation-as-product approach - dedicated technical writers, user testing, performance metrics.

Community-driven content - wiki-based collaboration, user contributions, feedback integration.

Multi-channel publishing - single source for web, mobile, PDF, and API formats.

9. Accessibility Considerations

WCAG compliance requirements

Target WCAG 2.2 AA compliance as minimum standard for software documentation.

Core accessibility principles:

• Perceivable: Provide text alternatives, sufficient color contrast (4.5:1 ratio), scalable text
• Operable: Keyboard accessible, adequate touch targets (44x44px minimum)
• Understandable: Consistent navigation, clear language, predictable functionality
• Robust: Valid HTML, assistive technology compatibility

Screen reader optimization

Use semantic HTML elements appropriately (<nav>, <main>, <article>, <section>).

Implement proper heading hierarchy without skipping levels - screen readers use headings for navigation.

Provide meaningful alt text for images, diagrams, and screenshots that convey essential information.

Create descriptive link text instead of “click here” or “read more” - screen readers often navigate by links.

Inclusive design practices

Use person-first language when discussing disabilities and avoid ableist metaphors.

Support multiple content formats - text, video with captions, audio descriptions for visual content.

Design for various contexts - mobile accessibility, low-bandwidth situations, different assistive technologies.

10. User Experience Principles for Documentation

User-centered navigation design

Implement consistent navigation patterns across all documentation pages with familiar UI conventions.

Provide multiple pathways to information - search, browsing, cross-references, contextual links.

Include wayfinding elements - breadcrumbs, “on this page” navigation, clear page titles.

Mobile-responsive principles

Mobile-first content strategy - prioritize essential content for small screens using progressive disclosure.

Optimize touch interactions - minimum 44x44px touch targets, adequate spacing between elements.

Ensure readability without horizontal scrolling across all device sizes.

Performance and usability

Optimize loading performance especially for mobile networks and international users.

Implement robust search functionality with autocomplete and filtering capabilities.

Design for scanning behavior - users scan rather than read comprehensively, so use clear visual hierarchy.

Feedback and iteration

Include user feedback mechanisms - rating systems, comment functionality, improvement suggestions.

Track key metrics - time to first success, task completion rates, user satisfaction scores.

Conduct regular user testing with actual developers and document users to identify pain points.

Implementation Checklist

Getting started

• Choose documentation platform based on team needs and technical requirements
• Establish style guide and enforce consistency across all content
• Create user personas including developers with disabilities
• Implement feedback collection system

Content quality

• Conduct accessibility audit against WCAG 2.2 AA standards
• Test documentation with screen readers and assistive technologies
• Validate content with actual users through testing sessions
• Establish regular review and update cycles

Continuous improvement

• Integrate documentation into development workflow
• Monitor analytics and user behavior data
• Act on user feedback and iterate based on real usage patterns
• Maintain up-to-date examples and code samples

Conclusion

Exceptional software documentation requires treating it as a core product feature with dedicated resources, user research, and continuous improvement. Success comes from understanding user needs, implementing accessibility standards, maintaining high content quality, and integrating documentation deeply into development processes.

The investment in great documentation pays dividends through reduced support costs, higher user adoption, improved developer experience, and stronger community engagement. Most importantly, it ensures your software tools can be successfully used by everyone who needs them, regardless of their experience level or abilities.

[Puchaczov]

Copilot, start working on it, use article and unit tests and repository to figure out what is suppported. Strat with table and f content and short and concise introduction. Put new markdown files in .docs2 directory, you can use index as your toc file.

[Copilot]

Copilot, start working on it, use article and unit tests and repository to figure out what is suppported. Strat with table and f content and short and concise introduction. Put new markdown files in ....

I've started creating the comprehensive documentation in the .docs2 directory as requested. The foundation is now in place with:

• index.md - Complete table of contents covering all syntax elements
• Basic query structure - SQL fundamentals and Musoq-specific differences
• Schema and data source syntax - The #schema.method() pattern for all data sources
• Table definitions - Type system and custom table creation
• Coupling syntax - Binding tables to data sources
• Common Table Expressions - WITH clauses and complex query patterns

The documentation follows the style guide from your previous comment, with task-oriented organization, progressive disclosure, comprehensive examples, and accessibility-friendly formatting. All examples are derived from the repository's unit tests and README to ensure accuracy.

Ready to continue with the remaining syntax elements. Commit: 7650584

[Puchaczov]

fine, this looks promising, lets proceed with documentation articles

[Puchaczov]

Proceed with next documentation articles

[Puchaczov]

@copilot proceed with next documentation articles

[Copilot]

fine, this looks promising, lets proceed with documentation articles

I've completed the core SQL syntax documentation covering SELECT, FROM, WHERE, ORDER BY, GROUP BY, and HAVING clauses. Each article includes comprehensive examples derived from the repository's unit tests and follows the style guide with task-oriented organization and progressive disclosure. Ready to continue with JOIN operations and advanced query constructs next. Commit: aa47825

Proceed with next documentation articles

Continued with core SQL syntax documentation. Added comprehensive coverage of SELECT, FROM, WHERE, ORDER BY, GROUP BY, and HAVING clauses with practical examples for file system analysis, Git repository insights, and code quality patterns. All examples are based on actual unit tests and repository usage. Next sections will cover JOIN operations and advanced query constructs. Commit: aa47825

@copilot proceed with next documentation articles

Proceeding with documentation articles as requested. I've completed the foundational SQL syntax elements - SELECT, FROM, WHERE, ORDER BY, GROUP BY, and HAVING clauses. Each article provides comprehensive coverage with real-world examples for file analysis, Git insights, and code quality assessment. The documentation follows accessibility standards and progressive disclosure principles. Ready to continue with JOIN operations and advanced features. Commit: aa47825