WSCI允许声明异常行为，由Web服务在编排好的点显示出来。
WSCI allows declaring exceptional behavior that is exhibited by a web service at a given point in choreography.
这些信息可能是一系列的声明、异常事件、或是事务特性。
This information might be a set of declarations, exceptional events, or transactional properties.
如果不能，那么声明包装方法本身抛出异常。
If you can't, declare that the enclosing method itself throws the exception.
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