The following values are defined for the Type field in the Import Header:
| Constant | Value | Description |
| IMPORT_CODE | 0 | The import is executable code. |
| IMPORT_DATA | 1 | The import is data. |
| IMPORT_CONST | 2 | The import was specified as CONST in the .def file. |
These values are used to determine which section contributions must be generated by the tool using the library if it must access that data.