All sorts of different CAD system has its own data format of memory graphics, mutual exchange of graphical data is difficult between CAD systems.

各种不同的CAD系统都有其特殊的存储图形数据格式，各CAD系统间难以相互交换图形数据。

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This paper offers a detailed introduction of the Generalized Multi-List (GML), a data structure defined in the project "the Implementation of Initial Graphics Exchange Specification".

本文介绍了“基本图形交挟规范IGES的实现”这一“七五”项目中所定义的数据结构——广义多重表（GML）。

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CAD graphics standard data exchange format - DXF format, we can easily share resources, without the need to repeat modeling.

利用CAD图形标准数据交换格式—DXF格式，我们就能很容易地实现资源共享，而不需要重复建模。

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