Relations are flat, highly structured, strongly typed, and unordered while XML data is ordered, nested, hierarchical, optionally typed and often irregular and semi-structured.
关系型数据是平面的、高度结构化、强类型化、无序的，而XML数据是有序、嵌套的、层次化的、可选类型化的，并且往往不规则且是不完全结构化的。
Relations are flat, highly structured, strongly typed, and unordered while XML data is ordered, nested, hierarchical, optionally typed and often irregular and semi-structured.
关系型数据是平面的、高度结构化、强类型化、无序的，而XML数据是有序、嵌套的、层次化的、可选类型化的，并且往往不规则且是不完全结构化的。
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