When there is an array of fields in the input or output message, certain transforms are available to perform an action on each element of an array, or to merge several input arrays into one output.

当输入或输出信息中有包含字段的数组时，可以对数组中的每个元素执行某些转换，或者将几个输入数组合并到一个输出中。

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Common primitive types are string, integer and Boolean; however, as you'll see a little further along in this article, you can also map an element to an array or a custom class.

常见的基本类型有string、integer和boolean，不过，后面将看到还能将元素映射为数组或自定义类。

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For each element in such a pattern, a -1 or + 1, there is a node object in an array of nodes.

对应于这类图案中的每一个元素，- 1或者+ 1，在节点数组中都有一个节点对象。

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