Composite types are defined in an enum type diet_type_t:
| Type | Possible base types |
|---|---|
| DIET_SCALAR | all base types |
| DIET_VECTOR | all base types |
| DIET_MATRIX | all base types |
| DIET_STRING | DIET_CHAR |
| DIET_FILE | DIET_CHAR |
Each of these types requires specific parameters to completely describe the data (see Figure 3.1).