XML is a kind of open data structure, which can stress the description of data structure in the description of data. The relationship between data can be come out easily , which can achieve the data structure design.

• 可扩展置标语言XML是一种开放的自我描述方式定义了数据结构，在描述数据内容的同时能突出对结构的描述，从而体现出数据之间的关系，实现了数据结构化设计。