# XWQuery Extraction Summary

**Date:** October 11, 2025  
**Company:** eXonware.com  
**Author:** eXonware Backend Team  
**Email:** connect@exonware.com

## Overview

XWQuery has been successfully extracted from xwnode into a standalone library. This document summarizes the extraction process and next steps.

---

## What Was Extracted

### From xwnode/src/exonware/xwnode/queries/
The entire `queries/` directory was extracted, containing:

1. **Strategies** (35+ query format converters)
   - SQL, GraphQL, Cypher, SPARQL, Gremlin
   - MongoDB (MQL), Elasticsearch (DSL), Neo4j (Cypher)
   - Time-series: PromQL, Flux, LogQL
   - Data queries: JQ, JMESPath, XPath, XQuery
   - And 25+ more formats

2. **Executors** (50 operation implementations)
   - Core: SELECT, INSERT, UPDATE, DELETE, CREATE, ALTER, DROP
   - Filtering: WHERE, FILTER, BETWEEN, LIKE, IN, HAS
   - Aggregation: SUM, COUNT, AVG, MIN, MAX, GROUP BY, HAVING
   - Graph: MATCH, PATH, OUT, IN_TRAVERSE, RETURN
   - Advanced: JOIN, UNION, WITH, PIPE, WINDOW

3. **Parsers**
   - XWQuery script parser
   - SQL parameter extractor
   - Base parser infrastructure

4. **Supporting Components**
   - Execution engine
   - Operation registry
   - Capability checker
   - Error definitions
   - Contracts and interfaces

---

## New Project Structure

```
xwquery/
├── src/
│   ├── exonware/
│   │   ├── __init__.py           # Namespace package
│   │   └── xwquery/
│   │       ├── __init__.py        # Main facade
│   │       ├── version.py         # Version management
│   │       ├── strategies/        # 35+ query formats
│   │       ├── executors/         # 50 operations
│   │       └── parsers/           # Query parsers
│   └── xwquery.py                # Convenience alias
├── tests/
│   ├── core/                     # Core functionality tests
│   ├── unit/                     # Unit tests
│   ├── integration/              # Integration tests
│   ├── runner.py                 # Test runner
│   └── verify_installation.py    # Installation verification
├── examples/
│   └── basic_usage.py            # Basic examples
├── docs/
│   └── PROJECT_PHASES.md         # Development roadmap
├── pyproject.toml                # Project configuration
├── requirements.txt              # Dependencies
├── README.md                     # Project documentation
└── LICENSE                       # MIT License
```

---

## Dependencies

### XWQuery depends on:
- **exonware-xwsystem** - Core system utilities
- **exonware-xwnode** - Node-based data structures (execution target)

### XWNode can optionally use:
- **exonware-xwquery** - For query language features

---

## Key Features

### 1. Universal Query Language
```python
from exonware.xwquery import XWQuery

# Query any data structure
result = XWQuery.execute("SELECT * FROM users WHERE age > 25", data)
```

### 2. Format Conversion
```python
# Convert between 35+ formats
sql = "SELECT id, name FROM users WHERE age > 25"
graphql = XWQuery.convert(sql, from_format='sql', to_format='graphql')
```

### 3. Type-Aware Execution
- Automatically optimizes for node types (LINEAR, TREE, GRAPH, MATRIX)
- Uses appropriate algorithms for each structure
- Performance-optimized execution paths

### 4. Extensible Architecture
```python
# Add custom operations
from exonware.xwquery import register_operation, AUniversalOperationExecutor

@register_operation("CUSTOM")
class CustomExecutor(AUniversalOperationExecutor):
    OPERATION_NAME = "CUSTOM"
    def _do_execute(self, action, context):
        # Your implementation
        return ExecutionResult(data={'result': 'done'})
```

---

## Installation

### For Users
```bash
# Install xwquery (automatically installs xwnode and xwsystem)
pip install exonware-xwquery

# Or install from source
cd xwquery
pip install -e .
```

### For Development
```bash
cd xwquery
pip install -e ".[dev]"
```

---

## Usage

### Import Methods
```python
# Full path
from exonware.xwquery import XWQuery, execute, parse, convert

# Convenience alias
import xwquery
```

### Basic Query
```python
from exonware.xwquery import XWQuery

data = {'users': [
    {'name': 'Alice', 'age': 30},
    {'name': 'Bob', 'age': 25}
]}

result = XWQuery.execute("SELECT * FROM users WHERE age > 25", data)
print(result.data)
```

### Format Conversion
```python
sql = "SELECT * FROM users"
graphql = XWQuery.convert(sql, to_format='graphql')
cypher = XWQuery.convert(sql, to_format='cypher')
```

---

## Testing

### Run All Tests
```bash
cd xwquery
python tests/runner.py
```

### Run Specific Test Types
```bash
python tests/runner.py --core
python tests/runner.py --unit
python tests/runner.py --integration
```

### Verify Installation
```bash
python tests/verify_installation.py
```

---

## Backward Compatibility

### Option 1: Keep Query Code in xwnode (Recommended for now)
- xwnode keeps its query functionality
- xwquery provides enhanced, standalone version
- Users can choose which to use
- Gradual migration path

### Option 2: Remove Query Code from xwnode
- xwnode focuses purely on node data structures
- All queries go through xwquery
- xwnode adds xwquery as dependency
- Clean separation of concerns

**Recommendation:** Start with Option 1 for backward compatibility, deprecate xwnode queries in future version, eventually move to Option 2.

---

## Next Steps

### Immediate (Version 0.0.1)
- [x] Extract code to new project
- [x] Create project structure
- [x] Set up tests
- [x] Create basic documentation
- [ ] Run full test suite
- [ ] Verify installation
- [ ] Publish to PyPI

### Short-term (Version 0.1.x)
- [ ] Expand test coverage to 80%+
- [ ] Add more examples
- [ ] Performance benchmarking
- [ ] API documentation
- [ ] Integration guides

### Medium-term (Version 1.0.0)
- [ ] Production stabilization
- [ ] Performance optimization
- [ ] Complete documentation
- [ ] Migration guide for xwnode users
- [ ] Release announcement

---

## Migration Guide for xwnode Users

### Before (using xwnode queries)
```python
from exonware.xwnode import XWNode
from exonware.xwnode.queries.strategies.xwquery import XWQueryScriptStrategy

node = XWNode.from_native({'users': [...]})
parser = XWQueryScriptStrategy()
# ... use parser ...
```

### After (using xwquery)
```python
from exonware.xwnode import XWNode
from exonware.xwquery import XWQuery

node = XWNode.from_native({'users': [...]})
result = XWQuery.execute("SELECT * FROM users WHERE age > 25", node)
```

**Benefits:**
- Cleaner API
- Better separation of concerns
- Independent versioning
- More features
- Better documentation
- Standalone usage without xwnode

---

## Architecture Decisions

### Why Extract from xwnode?

1. **Separation of Concerns**
   - xwnode: Data structures and node operations
   - xwquery: Query language and format conversion
   - Clear, focused responsibilities

2. **Reusability**
   - Query language can evolve independently
   - Can be used with xwdata, xwschema, xwentity
   - Not locked to node structures

3. **Marketability**
   - "Universal Query Language for Python" is compelling standalone
   - Easier to discover and adopt
   - Clear value proposition

4. **Maintainability**
   - Separate test suites
   - Independent versioning
   - Focused development
   - Easier to contribute

### Why Keep Dependency on xwnode?

XWQuery executes queries **on** xwnode structures, so it makes sense for xwquery to depend on xwnode. This creates a clean layered architecture:

```
xwsystem (Layer 0) - Core utilities
    ↓
xwnode (Layer 1) - Data structures
    ↓
xwquery (Layer 2) - Query language
    ↓
xwdata (Layer 3) - Format-aware data (can use queries)
    ↓
xwschema (Layer 4) - Schema validation (can use queries)
    ↓
xwentity (Layer 5) - Entity management (can use queries)
```

---

## Success Metrics

### Extraction Complete ✅
- [x] All query code moved to xwquery
- [x] Project structure created
- [x] Dependencies configured correctly
- [x] Basic tests passing
- [x] Documentation started

### Next Milestones
- [ ] 80% test coverage
- [ ] Installation verified on multiple Python versions
- [ ] Published to PyPI
- [ ] 5+ usage examples
- [ ] Complete API documentation

---

## Contact & Support

**Company:** eXonware.com  
**Author:** eXonware Backend Team  
**Email:** connect@exonware.com  
**Repository:** https://github.com/exonware/xwquery  
**Documentation:** https://github.com/exonware/xwquery#readme

---

*XWQuery extracted successfully on October 11, 2025*  
*Now part of the exonware ecosystem as a standalone library*

