time-slice map 时间切片图
The transformation problem that is solved by the WebSphere TX map is to select all of the meter reading Quantity values that belong to a given slice, and then total the values.
这个WebSphere TX映射要解决的转换问题是，选择属于给定的数据片的所有读数quantity值，然后求出这些值的和。
The first functional map call is executed for each slice of data and is shown below in Figure 19. The second argument in the call carries the index of the current slice
对于每个数据片，都执行第一个功能性映射调用，见图 19。
The solution taken by the map is to use an EXTRACT function to select the occurrences of Quantity for the current slice.
这个映射采用的解决方案是使用EXTRACT函数选择当前片的Quantity。
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