PDF is a file format developed by Adobe Systems for representing documents in a manner that is separate from the original operating system, application or hardware from where it was originally created. Various group codes allow for the definition of the start and end points, centre point and extrusion directions. For example there are a large number of group codes related to the creation of an ellipse. The data contained within a DXF is known as tagged data which means that the tags identify how the data should be interpreted. These include the Header which contains file property information, Classes, Tables, Entities, Blocks and Thumbnail Image section. The market leading popularity of AutoCAD has also reduced the requirement for an application independent format.ĭXF files are organised in way that allows the files to be opened by a normal text editor application.vA DXF file has a common format containing a number of sections. However in recent years the usefulness of DXF format has reduced due to DXF not being able to support more advanced CAD elements such as dynamic blocks. This was particularly important for early versions of CAD as reverse engineering of the closely guarded DWG format was limited. The DXF file format was created by Autodesk in 1982 and the intention was to create a format that was independent of CAD applications and therefore eased the difficulties of sharing files created by different applications.

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