Impacts: The result of calculations on data items that contain null data values.

影响：在包含null数据值的数据项上的计算的结果。

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Usage: This parameter controls whether or not null data values are treated as zeros when used in calculations.

用法：该参数控制在计算中是否将null数据值看作0。

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This is because the XPath runtime engine in Message Broker 6.1 (inline with the W3C XPath specification) doesn't support the concept of a NULL data type.

这是因为Message Broker 6.1(符合W3C XPath规范)中的XPath运行时引擎不支持NULL数据类型的概念。

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