https://forums.autodesk.com/t5/autocad-2000-2000i-2002-archive/2d-polyline-vs-polyline/m-p/111136#M32068 one is lightweight (optimized) which helps in keeping file size down, the other <BR /> is heavyweight (traditional)<BR /> <BR /> Jason Michel wrote:<BR /> &gt; What is the difference between a "2D Polyline" and a "Polyline"?<BR /> &gt; <BR /> &gt; Thanks in advance!<BR /> &gt; <BR /> &gt; <BR /> <BR /> <BR /> -- <BR /> Dave C. Johnson<BR /> djohnson@wwcengineering.com<BR /> WWC Engineering<BR /> Sheridan WY.<BR /> Windows 2k2<BR /> Acad Map 5<BR /> Survcadd XML Mon, 14 Jul 2003 12:45:20 GMT Anonymous 2003-07-14T12:45:20Z