100

DXF: Subclass marker (AcDbProxyObject)

90

DXF: Proxy object class ID (always 499)

91

DXF: Application object's class ID. Class IDs are based on the order of the class in the CLASSES section. The first class is given the ID of 500, the next is 501, and so on.

93

DXF: Size of object data in bits

310

DXF: Binary object data (multiple entries can appear).

330 or 340 or 350 or 360

DXF: An object ID (multiple entries can appear).

94

DXF: 0 (indicates end of object ID section)