每当其他元素被解析时，您将这个Employee对象弹出Stack，调用相关的set函数，然后将该对象推回Stack。

When each of the other elements are parsed, you pop the Employee object off the stack, call the relevant set function, and push the object back on to the stack.

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当xml解析器遍历xml源并发现开始了一个新元素时，它会触发指定为回调函数的startelement函数。

When the XML parser goes through the XML source and finds that a new element is started, it triggers the startElement function, which you specified as a callback function.

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