The following group codes are used by LAYER_INDEX objects.
LAYER_INDEX group codes
Group code
Description
0
Object name (LAYER_INDEX)
5
Handle
102
Start of persistent reactors group; always “{ACAD_REACTORS”
330
Soft-pointer ID/handle to owner dictionary
End of persistent reactors group, always “}”
100
Subclass marker (AcDbIndex)
40
Time stamp (Julian date)
Subclass marker (AcDbLayerIndex)
8
Layer name (multiple entries may exist)
360
Hard-owner reference to IDBUFFER (multiple entries may exist)
90
Number of entries in the IDBUFFER list (multiple entries may exist)