The IDRISI reader first scans the folder it is given for the IDRISI files defined in the mapping file.
For each IDRISI file that it finds, it checks to see if that file is requested by looking at the list of IDs specified in the mapping file. If a match is made or no IDs were specified in the mapping file, the IDRISI file is opened. The IDRISI reader then extracts features from the file one at a time, and passes them on to the rest of the FME for further processing. If an additional Access database is available, the user-defined attributes will also be passed to the FME. When the file is exhausted, the IDRISI reader move on to the next file in the folder.
Optionally, a single IDRISI file can be specified in the mapping file. If this is the case, only that IDRISI file is read.