The url variable is a well-formed String.

url 变量是一个格式良好的 String。

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It then USES string concatenation to create a complete, well-formed XML document from it.

然后使用字符串连接创建完整的、结构良好的XML文档。

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Offset Unsigned long integer giving the IL offset from the input string, or zero if there was no IL offset or the string was not well formed.

无符号长整型数，它给出输入字符串的IL偏移量，或在没有IL偏移量或字符串格式不良时给出零。

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