This capability lets business process designers model and catch system exceptions, and execute error logic if a BPEL client returns a system exception.

业务流程设计人员使用此功能可以模拟和捕获系统异常，并在BPEL客户端返回系统异常时执行错误逻辑。

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However, since any logic models cannot enumerate all possibilities, such a model will fail once any developer defined a system using a different approach.

不过，由于任何逻辑模型都无法枚举出所有可能性，一旦任何开发人员使用不同的方法定义了一个系统，则此类模型将无法使用。

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Sequence diagrams model the flow of logic within your system in a visual manner, enabling you to both document and validate your logic, and are commonly used for both analysis and design purposes.

序列图以可视方式为系统中逻辑的流程建模，能够让您记载和验证逻辑，这通常用于分析和设计目的。

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