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Chapter 4. Reliable Message Delivery
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## Chapter 4. Reliable Message Delivery

## 4.1. Overview

Reliable Messaging and data integrity are critical STAR Transport Guideline requirements. To support Reliable Messaging in an interoperable fashion, standards must be used. This section looks at the requirements necessary to provide Reliable Messaging and discusses the standards that enable these capabilities.

STAR anticipates that parties will exchange messages using a variety of message exchange models including but not limited to Asynchronous, Synchronous, Client Initiated or Bi-directional Communication, Request/Response or Pull based messaging, and routing through intermediaries.

In general, Reliable Messaging is more germane to asynchronous styles of messaging, but STAR anticipates that the standards chosen will provide benefits for all types of message exchange models within the industry.

A STAR compliant transport mechanism MUST respond to reliability requests and be able to deliver the reliability requested by business applications. Specifically, if an XML BOD requires a level of reliability, such as “at-least-once”, and the transport handler cannot negotiate that level of request with the partner system an error MUST be returned (Web services stack and profile). If a business process specifies a level of reliability, then the partner system must be able to recognize that request and respond. The applications that use these transports must decide how to handle exceptions of the ability of a handler to provide the reliability requirement. Handlers MUST be able to respond to reliability requests to be STAR compliant.

The upstream automotive industry employs a variety of business models and technology architectures. In some cases business messages are passed through an intermediate party before arriving at the end destination.

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