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X applications connect to one another and the outside world using the Simple Message Abstraction layer, SMA. SMA defines a simple yet robust messaging API that allows any messaging provider to be seamlessly plugged in the the platform by implementing a bus binding for the provider.

An application's AepEngine handles much of the interaction with SMA on behalf of the application. It manages the lifecycle of an application's message bus bindings, provides send methods and perform performs dispatch of received messages in a transactionally atomic fashion. This document outlines the core concepts of SMA as they pertain to an application developer. At a high level a developer thinks in terms of defining the messages that make up an application's interaction grammar and the logical channels on which those messages are transported to wire together the various application participants in the system:

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