They may determine the datastructure of external interfaces or some physical systems, and therefore represent physical data structures to be transformed within interfaces.
它们会确定外部接口或一些物理系统的数据结构，因此描绘出在接口中进行转换的物理数据结构。
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This means the structure of your objects is not tied to the structure of the XML — you can restructure your object classes without needing to change the XML format used for externaldata transfer.
By using the data of 2002, the paper empirically analyzes the relationship between external credit guarantee and performance and capital structure of listed companies.