Message Schema Definition

A message schema definition is a formal document or file that describes the structure, data types, and constraints of messages exchanged within a system. In financial derivatives trading, this schema serves as the single source of truth for how orders, cancellations, and execution reports must be formatted.

By strictly defining every field, the schema prevents ambiguity that could lead to trade errors or unintended liquidation. Developers use these definitions to generate code automatically, ensuring that both the client and the server are perfectly synchronized.

This eliminates human error in implementing communication protocols. It is a fundamental component of building robust, predictable, and scalable financial infrastructure.