Alternate courses will be introduced to describe potential usage errors, as well as business logic errors and exceptions.

引入备选过程是为了描述潜在的使用错误以及商业逻辑错误和异常。

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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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Adding new actions, exceptions, or Boolean logic is trivial.

新添操作、异常或布尔逻辑都是比较容易的事情。

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