DXF Group Codes
This section presents the group codes that apply to nongraphical objects. These codes are found in the OBJECTS section of a DXF file and are used by AutoLISP and ARX applications in entity definition lists.
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.
Objects are similar to entities, except that they have no graphical or geometric meaning. All objects that are not entities or symbol table records or symbol tables are stored in this section. This section represents a homogeneous heap of objects with topological ordering of objects by ownership, such that the owners always appear before the objects they own.