Chapter 3 -- CLASSES Section
CLASSES Section Group Codes

Each entry in the CLASSES section contains the groups described in the following table.

CLASSES section group codes
Group code Description

0

Record type (CLASS). Identifies beginning of a CLASS record

1

Class DXF record name; always unique

2

C++ class name. Used to bind with software that defines object class behavior. Always unique

3

Application name. Posted in Alert box when a class definition listed in this section is not currently loaded

90

Proxy capabilities flag. Bit-coded value that indicates the capabilities of this object as a proxy:
0 = No operations allowed (0)
1 = Erase allowed (0x1)
2 = Transform allowed (0x2)
4 = Color change allowed (0x4)
8 = Layer change allowed (0x8)
16 = Linetype change allowed (0x10)
32 = Linetype scale change allowed (0x20)
64 = Visibility change allowed (0x40)
127 = All operations except cloning allowed (0x7F)
128 = Cloning allowed (0x80)
255 = All operations allowed (0xFF)
32768 = R13 format proxy (0x8000)

280

Was-a-proxy flag. Set to 1 if class was not loaded when this DXF file was created, and 0 otherwise

281

Is-an-entity flag. Set to 1 if class was derived from the AcDbEntity class and can reside in the BLOCKS or ENTITIES section. If 0, instances may appear only in the OBJECTS section


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