程序集中的每一步都将整个分层输入传递到输出，另外一个额外的扩充分支被添加到输出中，包含步骤计算的结果。

Each step in the assembly passes the entire hierarchical input to the output, plus an additional enrichment branch is added to the output that contains the result of the step computation.

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一个需要解决的关键问题是，如何对可靠的消息传递的支持进行分层。

A key issue that must be addressed is how to layer the support for reliable messaging.

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可靠的消息传递功能的建议分层。

Proposed layering of reliable messaging function.

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