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ASCII Drawing Interchange file format

Standard ASCII text files used in CAD products such as AutoCAD to store vector data. Uses the extension .DXF.

The basic organization of a AutoCAD DXF file is as follows:

Linetype (LTYPE) table
Layer table
Text style (STYLE) table
View table
User Coordinate System (UCS) table
Viewport configuration (VPORT) table
online-documentations of several DXF-versions: