The attribute and geometric information within DLG data sets are encoded indirectly with major, minor, and linkage codes. The FME generates mapping files that can interpret all of these codes. The suggested method of creating custom mapping files for reading DLG data is to start with a generated mapping file. This provides an easy way to harness the enhanced semantic interpretation of all attribute codes and linkages built into the FME distribution. The following information pertains to the features and attributes produced by the mapping files generated to read DLG data.