• 1. add element to sequence: 向序列添加元素

• 1.It will iterate over each element of the idx sequence, evaluate the expression, and add the result to the return sequence.
  它将迭代id x序列中的每个元素，求得表达式的值，并将结果添加到这个返回序列。
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• 2.To fix this, you must declare an XML element containing an empty sequence and add a part to the message with this element. Listing 3 demonstrates how such an XML element can be declared.
  为了纠正这个错误，必须声明一个包含空序列的xml元素，并用这个元素将一个部分添加到消息中。
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• 3.To this, add a sequence activity that will be the outermost structural element required in the Echo process.
  为此，请添加一个sequence活动，它将成为回送流程所要求的最外层的结构元素。
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