→ https://www.loc.gov/marc/bibliographic/bdleader.html
| Marc Code | Marc Description | FTX documentTypeCode | FTX documentGenreCode |
|---|---|---|---|
| g | Projected medium | AV (Audiovisuelles Material) | A (Audiovisuelles Material) |
| i | Nonmusical sound recording | T (Audio-Material) | |
| a | Language material | alle anderen | alle anderen |
| m | Computer file | EL (Elektronische bzw. Online-Ressource) |