This function iterates as many times as the value of the $indentation class variable, and for each iteration it adds the $indentationValue class variable to $xml, and returns it.

此函数需要迭代的次数与 $indentation 类变量值相同，对于每次迭代，它将 $indentationValue 类变量添加到 $xml，并将后者返回。

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The way of accelerating iteration process was discussed also. By improving Simpson's algorithm, for variable step length, integral operation may increase in speed by one to dozens of times.

本文还讨论了加速迭代过程的方法，将变步长辛普生积分算法作适当的改进，其积分运算速度可提高一到几十倍。

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