DXF™ 格式是以带标记数据的形式表示的 AutoCAD® 图形文件中包含的所有信息。 带标记数据是指文件中的每个数据元素前面都带有一个称为组码的整数。 组码的值指出了后面的数据元素的类型， 还指出了数据元素对于给定对象（或记录）类型的含义

Packet : dxf参考手册.zip filelist
dxf参考手册.chm

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