该样本代码提供了组成该结构的数据定义语言（Data Definition Language，DDL）和集成交换格式（Integration Exchange Format，IXF）文件。
The sample code provides the Data Definition Language (DDL) and Integration Exchange Format (IXF) files which make up the structure.
您可以选择一种样式语言来定义文件结构，每一种在表达能力和工具支援上各不相同。
You have a choice of schema languages with which to define your document structure each with different levels of expressivity and tool support.
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