documentation for the library: https://qcad.org/doc/dxflib/2.5/reference/reading.html
DXF file format documentation: https://images.autodesk.com/adsk/files/autocad_2012_pdf_dxf-reference_enu.pdf
documentation for the library: https://qcad.org/doc/dxflib/2.5/reference/reading.html
DXF file format documentation: https://images.autodesk.com/adsk/files/autocad_2012_pdf_dxf-reference_enu.pdf