CAD programs like CATIA can export 3DXML drawings to common DXF format. The same may also probably be possible in other CAD software or dedicated CAD converters.
Convert Dassault Systems Universal 3D XML document to AutoCAD DXF Drawing Exchange Format.
We found 2 software records in the database related to .3dxml to .dxf file format conversion.
Microsoft Windows software - convert 3dxml to dxf on Windows
A PLM/CAD/CAM/CAE software suite
Convert from 3dxml file format
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned 3dxml to dxf. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
A CAD converter with huge format support