Because there are no attribute standards, many programs that claim to read DXF files still do not import attribute information properly. It carries very accurate coordinate information and sophisticated feature- classification information but no other attribute data. DLG does not include any display information. The DLG standard is significant because the USGS and other US government agencies have used it to publish large numbers of digital maps. It is usually not appropriate for the storage or transfer of GIS data.
Attribute links are implicit in the file format.
MapInfo Map Files. MapInfo has its own internal binary format, known as a map file. It is undocumented and proprietary, so it cannot be used outside a MapInfo system. DGN is the internal format used by Bentley Systems Inc. s MicroStation, a CAD program. It is well documented and standardized, so it may also be used as a transfer standard.