AutoCAD 2012 DXF Reference February 2011 © 2011 Autodesk, Inc. All Rights Reserved. Except as otherwise permitted by Autodesk, Inc., this publication, or parts thereof, may not be reproduced in any...... 239 Chapter 10 Advanced DXF Issues . . . . . . . ...Interchange File Formats on page 217 Advanced concepts relating to DXF group...