给出适当数据结构的引用，第二个子例程将它转换为XML文档，根据参数的不同，产生的XML文档采用字符串格式或文件形式。
Given a reference to an appropriate data structure, the second converts it to an XML document, either in string format or as a file, depending upon its parameters.
不过，当您使用某个采用引用计数的数据结构时，您必须记得运行引用计数函数。
However, you must remember to run the reference counting functions whenever you are using a reference-counted data structure.
这意味着没有移动的旧文件可以保留ext3格式，但新的文件(或已被复制的旧文件)将采用新的ext4数据结构。
This means that old files that you have not moved can remain in the older ext3 format, while new files (or older files that have been copied) will occupy the new ext4 data structures.
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