Chapter 1 -- DXF Format
Organization of This Reference
Formatting Conventions in This Reference

Each group code listed in this reference is presented by a numeric group code value and a description. All group codes can apply to DXF files, applications (AutoLISP or ObjectARX), 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 preceded 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.

Optional codes are indicated as "optional" in the description.