有时候，需要将关系表或顺序文件转换成XML分层结构，例如XML文档或xml块。
Sometimes, relational tables or sequential files are required to be transformed to XML hierarchical structures, such as XML documents or XML chunks.
有时候，需要将关系表或顺序文件转换成XML分层结构，例如XML文档或xml块。
Sometimes, relational tables or sequential files are required to be transformed to XML hierarchical structures, such as XML documents or XML chunks.
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