它是真正的基于XML的标记语言，但是却不止是一种数据格式。
While it is indeed an XML-based markup language, it's not just a data format.
XML作为扩展性标记语言已经成为实现元数据描述的代语言。
XML, an extended sign language, is the only language to describe metadata.
XML作为扩展性标记语言已经成为实现元数据描述的代语言。
XML, an extended sign language, is the only language to describe metadata.
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