Appendix A -- Drawing Interchange File Formats
ASCII DXF Files
Class Group Codes in DXF Files

The following is an example of the CLASSES section of a DXF file:

  0
SECTION
  2
CLASSES


Beginning of CLASSES section



  0
CLASS
  1
<class dxf record>
  2
<class name>
  3
<app name>
90
<flag>
280
<flag>
281
<flag>


Repeats for each entry













  0
ENDSEC


End of CLASSES section