Matrix Specification Versioning

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Subtitle:

Evolution management strategy for the Matrix protocol standard

Core Idea:

Matrix employs a structured versioning system for its specification and APIs, allowing independent evolution of different components while maintaining backward compatibility where possible.

Key Principles:

1. Overall Specification Versioning:
   • Uses vX.Y format where X indicates breaking changes and Y represents backward-compatible features.
2. Independent API Versioning:
   • Each API (Client-Server, Server-Server, etc.) is versioned independently to allow separate evolution.
3. Deprecation Policy:
   • Features go through a formal deprecation process before removal, giving implementations time to adapt.

Why It Matters:

• Implementation Planning:
  • Developers can anticipate and prepare for changes based on versioning patterns.
• Compatibility Management:
  • Clear version boundaries help clients and servers maintain interoperability.
• Ecosystem Evolution:
  • Enables the protocol to evolve without breaking existing deployments.

How to Implement:

1. Version Support Declaration:
   • Servers advertise supported specification and API versions.
2. Feature Negotiation:
   • Clients and servers negotiate capabilities based on supported versions.
3. Deprecation Handling:
   • Implement deprecated features until removed in a future version if advertising support for versions containing them.

Example:

• Scenario:
  • Matrix introduces a new room version with improved state resolution algorithms.
• Application:
  • Servers advertise support for the new room version while maintaining backward compatibility with existing rooms.
• Result:
  • New rooms can use advanced features while existing rooms continue functioning without disruption.

Connections:

• Related Concepts:
  • Matrix Protocol: The overall protocol being versioned
  • Matrix APIs Overview: The APIs that are independently versioned
• Broader Concepts:
  • Semantic Versioning: General approach to software versioning
  • API Evolution Strategies: Techniques for evolving APIs over time

References:

1. Primary Source:
   • Matrix Specification: Versioning section
2. Additional Resources:
   • Matrix Specification Change (MSC) process documentation
   • Matrix Room Versions documentation

Tags:

#matrix #versioning #compatibility #specification #api #standards

Connections:

Sources:

• From: Matrix Specification