DXF Group Codes
The group codes described in this section are found in DXF files and used by applications. The BLOCKS section contains an entry for each block reference in the drawing.
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. Optional codes are shown in gray.