我们必须为其他平台上的客户机提供一种备选的接口定义，该定义是以基础消息格式文档的形式出现的。

For service clients on other platforms, we had to provide an alternative definition of the interface, which was in the form of documentation of underlying message formats.

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此模式对转换器和路由器模式进行了扩展，支持备选服务提供者（使用不同的接口提供语义等效的服务）概念。

This pattern extends both the translator and router patterns and supports the concept of alternate service providers who offer semantically equivalent services with differing interfaces.

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例如，涉及到复杂交付的外部系统的接口可能要求定义多个步骤或备选流。

For example, an interface to an external system that involves complex interaction may require several steps or alternative flows to be defined.

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