显然，要让这个过程生效，发送方和接收方必须在传送开始前就即将使用的散列函数达成一致。
Clearly, for this process to work, the sender and receiver must agree on the hash function that will be used before transmission begins.
函数的前几行组装SOAP消息。
The first several lines of the function assemble the SOAP message.
在任何对数据区域的引用生效前都必须在程序或函数中定义并声明它。
Data areas must be both defined and declared in a program or function before any reference to them becomes valid.
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