DXF Group Codes
General DXF Conventions
The DXF format is a tagged data representation of all the information contained in an AutoCAD drawing file of a specific version. Tagged data means that each data element in the file is preceded by an integer number that is called a group code. A group code's value indicates what type of data element follows. It also indicates the meaning of a data element for a given object (or record) type. Virtually all user-specified information in a drawing file can be represented in DXF format. The DXF format is essentially the same when used with applications (AutoLISP and ARX). However, there are a few minor differences for some data groups.
For specific information about the format of DXF files, see appendix B, "Drawing Interchange File Formats."
The group codes shown in this section can apply to DXF files, applications (AutoLISP or ARX), or both. When the description of a code is different for applications and DXF files (or only applies to one or the other), the description is preceeded by the following indicators:
APP Application-specific description
DXF DXF file-specific description
If the description is common to both DXF files and applications, no indicator is provided. Otherwise, the appropriate indicator is present.