# UI Layout Definition Format

**Version:** 1.3  
**Documentation Version:** 1.3  
**Author:** Dalibor Votruba  
**URL:** [quadarax.com/ui-layout-def](https://quadarax.com/ui-layout-def)

A comprehensive XML-based format for describing user interface layouts with inheritance, pattern definitions, view organization, external includes, platform-specific extensions, and advanced validation. This format enables cross-platform UI generation with strict validation, modular component libraries, and modern development practices.

## Table of Contents

- [Overview](#overview)
- [What's New in v1.3](#whats-new-in-v13)
- [Core Concepts](#core-concepts)
- [Document Structure](#document-structure)
- [View Definitions](#view-definitions)
- [Pattern Definitions](#pattern-definitions)
- [Wireframe Inheritance](#wireframe-inheritance)
- [Window Definitions](#window-definitions)
- [External Includes](#external-includes)
- [Window Includes](#window-includes)
- [Validation System](#validation-system)
- [Platform Support](#platform-support)
- [Advanced Features](#advanced-features)
- [Examples](#examples)
- [Best Practices](#best-practices)
- [Migration Guide](#migration-guide)

## Overview

The UI Layout Definition Format provides a standardized way to define user interfaces that can be translated to various platforms (Windows Forms, WPF, Avalonia, Qt, Web, Mobile). It emphasizes:

- **View-Based Organization**: Logical grouping of related UI components by business function
- **Separation of Concerns**: Pattern definitions separate from usage
- **Inheritance**: Base wireframes and views with specific overrides
- **External Includes**: Modular design with external pattern, view, validation, and window files
- **Advanced Validation**: Comprehensive rule system with custom validators and profiles
- **Cross-Platform**: Platform-specific control libraries with unified abstractions
- **Modern Features**: State management, accessibility, performance optimization, testing support

## What's New in v1.3

### Major Enhancements

1. **Advanced State Management**
   - Redux and MobX pattern support
   - Hierarchical and concurrent state machines
   - Persistence strategies (session, local, remote, distributed)
   - State transitions with conditions and actions

2. **Comprehensive Accessibility Framework**
   - WCAG 2.1 AA/AAA compliance tracking
   - Section 508 and ADA support
   - Screen reader optimization
   - Voice control and eye-tracking integration
   - High contrast and magnification support

3. **Performance Optimization System**
   - Performance metrics and targets
   - Lazy loading and virtualization
   - Memory and CPU monitoring
   - Auto-optimization suggestions
   - Frame rate optimization

4. **Security and Data Protection**
   - GDPR compliance features
   - Vulnerability protection patterns
   - Data encryption and anonymization
   - Permission-based access control
   - Security audit trails

5. **Enhanced Testing Framework**
   - Automated test generation
   - Multiple testing strategies (unit, integration, UI, e2e)
   - Accessibility testing automation
   - Performance testing integration
   - Cross-browser compatibility testing

6. **Advanced Localization**
   - RTL (Right-to-Left) language support
   - Cultural adaptation features
   - Resource bundle management
   - Dynamic language switching
   - Localization quality tracking

7. **Modern UI Controls**
   - Advanced Avalonia 11.0+ controls
   - Enhanced WinForms .NET 6+ support
   - New Gallery control for customizable item displays with box templates
   - Touch and gesture support
   - Animation and transition systems
   - Responsive design patterns

8. **Validation System 2.0**
   - Custom validator framework
   - Validation profiles and inheritance
   - Auto-fix suggestions
   - Performance-optimized validation
   - Integration testing for rules

### Breaking Changes from v1.2

- Enhanced schema validation requires updates to custom validators
- Some deprecated attributes removed (see migration guide)
- New required accessibility attributes for certain control types
- Updated namespace declarations for external schemas

### Schema Validation Status

✅ **All schema files and definitions are validated and consistent**
- All XSD schema files pass validation
- Pattern definitions (abstract-controls.xml) validate successfully against schemas
- Gallery control integration is fully validated
- Namespace declarations are correct and consistent across all files

## Core Concepts

### 1. View-First Design
Views represent logical business functions (ProductView, OrderView) that group related windows and define shared data context, state management, and behaviors.

### 2. Patterns-First Design
All controls and structures must be defined in the `<patterns>` section before use in windows, with comprehensive validation and platform-specific extensions.

### 3. External Includes
Modular design allows splitting definitions across multiple files:
- Pattern includes for control libraries
- View includes for business logic organization
- Validation includes for rule sets
- Window includes for UI definitions

### 4. Advanced State Management
Support for modern state management patterns including Redux, MobX, and state machines with persistence and synchronization.

### 5. Accessibility-First Design
Built-in support for WCAG compliance, screen readers, voice control, and adaptive technologies.

### 6. Performance Optimization
Integrated performance monitoring, lazy loading, virtualization, and optimization suggestions.

### 7. Security by Design
Comprehensive security framework with vulnerability protection, data encryption, and audit trails.

## Document Structure

```xml
<?xml version="1.0" encoding="UTF-8"?>
<ui-layout-def xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
               xsi:schemaLocation="ui-layout-definition ui-layout-def.xsd"
               version="1.3"
               schema-version="1.3"
               target-platform="avalonia"
               accessibility-compliance="wcag-aa">
  
  <!-- Enhanced validation rules with custom validators -->
  <validation-rules>
    <validation-include src="wcag-validation.xml" important="true" />
    <validation-include src="performance-rules.xml" important="true" />
    <validation-include src="security-rules.xml" important="true" />
    <custom-validator name="BusinessRuleValidator">...</custom-validator>
    <validation-profile name="ProductionProfile">...</validation-profile>
  </validation-rules>
  
  <!-- Enhanced pattern definitions -->
  <patterns>
    <pattern-include src="avalonia-controls.xml" important="true" platform="avalonia" />
    <pattern-include src="accessibility-controls.xml" important="true" />
    <pattern-include src="performance-controls.xml" important="false" />
  </patterns>
  
  <!-- Advanced view definitions -->
  <views>
    <view-include src="business-views.xml" important="true" />
    <view name="EnhancedView" type="ai-assisted" category="ai-enhanced">
      <state-management pattern="redux" persistence="distributed" />
      <accessibility level="aaa" tested="true" />
      <performance target-load-time="1000" memory-limit="100MB" />
      <security level="high" audit-required="true" />
      <localization default-culture="en-US" rtl-support="true" />
      <testing coverage-target="95" strategy="e2e" />
    </view>
  </views>
  
  <!-- Window includes with conditional loading -->
  <window-includes>
    <window-include src="main-windows.xml" important="true" />
    <window-include src="accessibility-windows.xml" important="false" />
  </window-includes>
  
  <!-- Enhanced window definitions -->
  <window name="ModernWindow" title="Enhanced Application" 
          target-platform="avalonia" schema-version="1.3">
    <data-binding>
      <data-context source="ModernViewModel" mode="TwoWay" />
    </data-binding>
    <accessibility compliance-level="wcag-aa">
      <screen-reader window-title="Modern Application" />
      <keyboard-navigation focus-trap="true" />
    </accessibility>
    <!-- Window content with modern controls -->
  </window>
  
</ui-layout-def>
```

## Advanced Features

### State Management

```xml
<view name="ReactiveView" type="real-time" category="analytics">
  <state-management pattern="redux" persistence="distributed">
    <state name="loading" initial="true" data-snapshot="LoadingState" />
    <state name="loaded" final="false" data-snapshot="LoadedState" />
    <transition from="loading" to="loaded" trigger="data-received" 
                condition="data.isValid" action="processData" />
  </state-management>
</view>
```

### Accessibility Framework

```xml
<accessibility compliance-level="wcag-aa">
  <compliance standard="wcag" level="aa" verified="true" />
  <feature name="screen-reader" type="screen-reader" required="true" />
  <feature name="voice-control" type="voice-control" required="false" />
  <feature name="high-contrast" type="high-contrast" required="true" />
</accessibility>
```

### Performance Optimization

```xml
<performance target-load-time="1000" memory-limit="100MB">
  <metric name="first-contentful-paint" type="load-time" target="800ms" critical="true" />
  <optimization technique="lazy-loading" impact="high" />
  <optimization technique="virtualization" impact="medium" />
</performance>
```

### Security Framework

```xml
<security level="high" audit-required="true">
  <permission name="data-read" type="read" required="true" scope="view" />
  <permission name="data-write" type="write" required="false" scope="data" />
  <vulnerability-protection type="xss" protection="input-sanitization" severity="high" />
  <data-protection encryption="true" gdpr-compliant="true" />
</security>
```

### Testing Integration

```xml
<testing coverage-target="95" strategy="e2e">
  <test-scenario name="user-login" type="functional" priority="high" automated="true">
    <step action="enter-username" expected="username-field-filled" />
    <step action="enter-password" expected="password-field-filled" />
    <step action="click-login" expected="dashboard-displayed" />
  </test-scenario>
  <automation framework="playwright" selector-strategy="accessibility" />
</testing>
```

### Localization Support

```xml
<localization default-culture="en-US" rtl-support="true">
  <supported-culture code="ar-SA" name="Arabic (Saudi Arabia)" completion="85" />
  <supported-culture code="he-IL" name="Hebrew (Israel)" completion="90" />
  <resource-bundle name="MainResources" path="Resources/Main" type="resx" />
</localization>
```

## Platform Support

### Enhanced Platform Integration

**Avalonia UI 11.0+**
- Full Avalonia 11 control set with modern features
- Advanced theming and styling support
- Cross-platform graphics and animations
- Touch and gesture recognition
- Performance optimizations and virtualization

**Windows Forms .NET 6+**
- Modern .NET 6+ WinForms support
- High DPI awareness and scaling
- Accessibility improvements
- Enhanced data binding
- WebView2 integration

**Web Technologies**
- Progressive Web App (PWA) support
- Modern CSS Grid and Flexbox layouts
- Web Components architecture
- Accessibility standards compliance
- Performance optimization techniques

**Mobile Platforms**
- Responsive design patterns
- Touch-first interactions
- Platform-specific optimizations
- Native control integration
- Performance monitoring

## Migration Guide

### From Version 1.2 to 1.3

#### Automatic Migration Support
Version 1.3 includes an automatic migration tool that can upgrade most 1.2 documents:

```bash
ui-layout-migrate --from 1.2 --to 1.3 --input myapp.xml --output myapp-v13.xml
```

#### Required Changes

1. **Update Schema References**
   ```xml
   <!-- Old -->
   <ui-layout-def version="1.2">
   
   <!-- New -->
   <ui-layout-def version="1.3" schema-version="1.3">
   ```

2. **Add Accessibility Compliance**
   ```xml
   <ui-layout-def accessibility-compliance="wcag-aa">
   ```

3. **Update Control Declarations**
   - Add `schema-version="1.3"` to custom controls
   - Update deprecated attribute names
   - Add accessibility attributes where required

4. **Enhanced Validation Rules**
   - Custom validators need implementation updates
   - New validation profiles should be configured
   - Performance and security rules are now included

#### Optional Enhancements

1. **Add State Management**
   ```xml
   <state-management pattern="redux" persistence="session">
   ```

2. **Enable Performance Monitoring**
   ```xml
   <performance target-load-time="2000" memory-limit="200MB">
   ```

3. **Configure Testing**
   ```xml
   <testing coverage-target="80" strategy="integration">
   ```

4. **Add Localization Support**
   ```xml
   <localization default-culture="en-US">
   ```

#### Compatibility Matrix

| Feature | v1.2 | v1.3 | Migration Required |
|---------|------|------|-------------------|
| Basic Controls | ✓ | ✓ | No |
| Window Includes | ✓ | ✓ | No |
| View Definitions | ✓ | ✓ | Optional |
| State Management | ✗ | ✓ | New Feature |
| Accessibility | Basic | Enhanced | Recommended |
| Performance | ✗ | ✓ | New Feature |
| Security | Basic | Enhanced | Recommended |
| Testing | ✗ | ✓ | New Feature |
| Localization | Basic | Enhanced | Optional |

### Breaking Changes

1. **Removed Deprecated Attributes**
   - `legacy-mode` attribute removed
   - `compatibility-level` replaced with `schema-version`

2. **Enhanced Validation Requirements**
   - Accessibility attributes now required for interactive controls
   - Performance targets recommended for data-heavy views

3. **Updated Namespace Requirements**
   - New namespace imports required for advanced features
   - External schema references updated

### Best Practices for Migration

1. **Incremental Migration**
   - Migrate core functionality first
   - Add advanced features incrementally
   - Test each migration step thoroughly

2. **Validation First**
   - Run validation before and after migration
   - Address all validation errors before proceeding
   - Use validation profiles for consistent results

3. **Testing Integration**
   - Add basic test scenarios during migration
   - Implement accessibility testing early
   - Use automated migration testing tools

4. **Performance Optimization**
   - Profile application performance before migration
   - Set realistic performance targets
   - Monitor improvements after migration

## Pattern Definitions

### New Gallery Control

The Gallery control is a specialized list control for displaying collections of items in customizable boxes with templates:

```xml
<patterns>
  <control name="Gallery" type="list" category="basic" inherits="CommonControl">
    <description>Gallery control for displaying collection of items in customizable boxes with templates</description>
    <constraints>
      <allowed-parents>Panel,SplitPanel,PopupPanel,TabPage</allowed-parents>
      <allowed-children>GalleryItem</allowed-children>
      <container>true</container>
      <requires-structure>gallery-items,box-template</requires-structure>
    </constraints>
    <attributes>
      <!-- Gallery-specific attributes -->
      <attribute name="image-width" type="int" min="16" max="512" default="64" />
      <attribute name="image-height" type="int" min="16" max="512" default="64" />
      <attribute name="box-width" type="int" min="32" max="1024" default="120" />
      <attribute name="box-height" type="int" min="32" max="1024" default="120" />
      <attribute name="paging-enabled" type="bool" default="false" />
      <attribute name="paging-page-size" type="int" min="1" max="1000" default="50" />
    </attributes>
    <structure>
      <gallery-items max-count="unbounded" />
      <box-template required="true" />
    </structure>
  </control>
</patterns>
```

### Gallery Usage Example

```xml
<Gallery name="ProductGallery" box-width="150" box-height="180" paging-enabled="true">
  <box-template name="ProductTemplate" width="140" height="170">
    <template-elements>
      <element name="ProductImage" type="image" x="10" y="10" width="120" height="80" data-binding="Image" />
      <element name="ProductName" type="text" x="10" y="100" width="120" height="20" data-binding="Name" font-style="bold" />
      <element name="ProductPrice" type="text" x="10" y="125" width="120" height="15" data-binding="Price" format-string="C2" />
    </template-elements>
  </box-template>
  <items>
    <GalleryItem text="Product 1" image="product1.jpg">
      <data-fields>
        <field name="Name" value="Premium Widget" />
        <field name="Price" value="29.99" />
        <field name="Image" value="images/widget.jpg" />
      </data-fields>
    </GalleryItem>
  </items>
</Gallery>
```

### Enhanced Control Definitions

```xml
<patterns>
  <control name="EnhancedTextBox" type="input" category="basic" schema-version="1.3">
    <description>Enhanced text input with validation and accessibility</description>
    <constraints>
      <allowed-parents>Panel,FormField</allowed-parents>
      <allowed-children>none</allowed-children>
      <container>false</container>
      <platform-constraints>
        <platform-constraint platform="avalonia" min-version="11.0" />
      </platform-constraints>
      <performance-hints virtualization-supported="false" memory-intensive="false" />
    </constraints>
    <attributes>
      <attribute name="text" type="string" default="" category="content" />
      <attribute name="placeholder" type="string" default="" category="display" />
      <attribute name="max-length" type="int" default="255" min="1" max="10000" category="validation" />
      <attribute name="validation-pattern" type="string" default="" category="validation" />
      <attribute name="aria-label" type="string" default="" category="accessibility" />
      <attribute name="high-contrast-support" type="bool" default="true" category="accessibility" />
    </attributes>
    <validation>
      <rule name="required-validation" type="required" message="This field is required" severity="error" />
      <rule name="pattern-validation" type="pattern" pattern="{validation-pattern}" message="Invalid format" severity="warning" />
    </validation>
    <accessibility>
      <requirement standard="wcag" level="aa" description="Keyboard accessible input" required="true" />
      <requirement standard="section-508" level="aa" description="Screen reader compatible" required="true" />
    </accessibility>
    <data-binding supports-two-way="true" supports-commands="false" supports-validation="true">
      <bindable-property name="Text" type="string" mode="TwoWay" dependency-property="true" />
      <bindable-property name="IsValid" type="bool" mode="OneWay" default-value="true" />
    </data-binding>
    <behavior>
      <event name="text-changed" async="false" cancelable="false" />
      <event name="validation-error" async="false" accessibility-event="true" />
      <command name="ClearCommand" can-execute-property="HasText" async="false" />
      <gesture name="double-tap" type="double-tap" description="Select all text" />
    </behavior>
  </control>
</patterns>
```

### Custom Validators

```xml
<validation-rules>
  <custom-validator name="EmailValidator" version="1.0" category="business-rules">
    <description>Validates email address format</description>
    <implementation>
      <rule-expression expression="matches(@text, '^[^@]+@[^@]+\.[^@]+$')" language="xpath" />
    </implementation>
    <parameter name="allow-empty" type="bool" default-value="false" description="Allow empty email addresses" />
    <test-case name="valid-email" description="Should accept valid email">
      <input>user@example.com</input>
      <expected-result>pass</expected-result>
    </test-case>
    <test-case name="invalid-email" description="Should reject invalid email">
      <input>invalid-email</input>
      <expected-result>fail</expected-result>
      <expected-message>Invalid email format</expected-message>
    </test-case>
  </custom-validator>
  
  <validation-profile name="ProductionProfile" version="1.0" target-platform="avalonia">
    <description>Production-ready validation profile with comprehensive checks</description>
    <profile-rule rule-name="EmailValidator" enabled="true" severity="error" />
    <profile-rule rule-name="AccessibilityValidator" enabled="true" severity="warning" />
    <profile-group group-name="SecurityValidation" enabled="true" override-severity="error" />
    <configuration stop-on-first-error="false" max-errors="50" parallel-execution="true">
      <setting key="strict-mode" value="true" scope="profile" />
      <exclusion pattern="*.test.xml" type="file" reason="Test files excluded from production validation" />
    </configuration>
  </validation-profile>
</validation-rules>
```

## Advanced View Definitions

### Modern Business View

```xml
<views>
  <view name="ModernProductView" type="ai-assisted" category="ai-enhanced" 
        schema-version="1.3" platform="avalonia" singleton="false" lazy-loading="true">
    <description>AI-enhanced product management with real-time collaboration</description>
    
    <metadata>
      <author>Development Team</author>
      <version>2.1.0</version>
      <created-date>2024-01-15</created-date>
      <documentation-url>https://docs.company.com/product-view</documentation-url>
      <tags>
        <tag>ai-enhanced</tag>
        <tag>real-time</tag>
        <tag>collaborative</tag>
      </tags>
    </metadata>
    
    <state-management pattern="redux" persistence="distributed">
      <state name="initializing" initial="true" data-snapshot="InitState" />
      <state name="loading" final="false" data-snapshot="LoadingState" />
      <state name="ready" final="false" data-snapshot="ReadyState" />
      <state name="error" final="false" data-snapshot="ErrorState" />
      <transition from="initializing" to="loading" trigger="start-load" action="beginLoad" />
      <transition from="loading" to="ready" trigger="load-complete" condition="data.isValid" action="finalizeLoad" />
      <transition from="loading" to="error" trigger="load-failed" action="handleError" />
    </state-management>
    
    <accessibility level="aaa" tested="true">
      <compliance standard="wcag" level="aaa" verified="true" />
      <compliance standard="section-508" level="aa" verified="true" />
      <feature name="screen-reader" type="screen-reader" required="true" implementation="NVDA,JAWS,VoiceOver" />
      <feature name="voice-control" type="voice-control" required="false" implementation="Dragon,Windows Speech" />
      <feature name="high-contrast" type="high-contrast" required="true" />
      <feature name="magnification" type="magnification" required="true" />
    </accessibility>
    
    <performance target-load-time="1000" memory-limit="100MB">
      <metric name="first-contentful-paint" type="load-time" target="800ms" critical="true" />
      <metric name="memory-usage" type="memory-usage" target="50MB" critical="false" />
      <optimization technique="lazy-loading" description="Load product data on demand" impact="high" />
      <optimization technique="virtualization" description="Virtualize large product lists" impact="medium" />
    </performance>
    
    <security level="high" audit-required="true">
      <permission name="product-read" type="read" required="true" scope="view" />
      <permission name="product-write" type="write" required="false" scope="data" />
      <permission name="product-admin" type="admin" required="false" scope="global" />
      <vulnerability-protection type="xss" protection="input-sanitization" severity="high" />
      <vulnerability-protection type="injection" protection="parameterized-queries" severity="critical" />
      <data-protection encryption="true" gdpr-compliant="true" />
    </security>
    
    <localization default-culture="en-US" rtl-support="true">
      <supported-culture code="ar-SA" name="Arabic (Saudi Arabia)" completion="85" verified="false" />
      <supported-culture code="he-IL" name="Hebrew (Israel)" completion="90" verified="true" />
      <supported-culture code="zh-CN" name="Chinese (Simplified)" completion="95" verified="true" />
      <resource-bundle name="ProductResources" path="Resources/Products" type="resx" />
      <resource-bundle name="CommonResources" path="Resources/Common" type="json" />
    </localization>
    
    <testing coverage-target="95" strategy="e2e">
      <test-scenario name="create-product" type="functional" priority="high" automated="true">
        <step action="click-new-product" expected="product-form-displayed" />
        <step action="enter-product-name" data="Test Product" expected="name-field-filled" />
        <step action="click-save" expected="product-saved-successfully" />
      </test-scenario>
      <test-scenario name="accessibility-navigation" type="accessibility" priority="high" automated="true">
        <step action="tab-navigation" expected="all-controls-reachable" />
        <step action="screen-reader-test" expected="proper-announcements" />
      </test-scenario>
      <automation framework="playwright" selector-strategy="accessibility" page-object-model="true" />
    </testing>
    
    <dependencies>
      <service-ref name="ProductService" interface="IProductService" scope="scoped" required="true" />
      <service-ref name="AIRecommendationService" interface="IAIService" scope="singleton" required="false" />
      <library-ref name="ChartingLibrary" version="2.1.0" source="nuget" optional="false" />
    </dependencies>
    
    <communication>
      <real-time>
        <connection name="product-updates" protocol="signalr" endpoint="/productHub" auto-reconnect="true" />
      </real-time>
    </communication>
  </view>
</views>
```

---

*This format specification v1.3 enables modern, accessible, performant, and secure cross-platform UI definitions with advanced development practices, comprehensive validation, and state-of-the-art tooling support.*