Proxy capabilities flag. Bit-coded value that indicates the capabilities of this object as a proxy:
C++ class name. Used to bind with software that defines object class behavior; always unique
Class DXF record name; always unique
Instance count for a custom class
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
Was-a-proxy flag. Set to 1 if class was not loaded when this DXF file was created, and 0 otherwise
Application name. Posted in Alert box when a class definition listed in this section is not currently loaded