它们定义了输出文件的结构与输入数据源的结构。
They define the structure of the input data source and the structure of the output document.
输入数据源名和可选的描述，单击ok。
Enter a name for this data source and, optionally, a description. Click OK.
当 XQuery 被作为顶层语言时，它需要一个输入数据的源。
When running as a top-level language, XQuery needs to have a source of input data.
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