In addition to processing Starlink NDF structures, KAPPA can also process many non-NDF (`foreign') data files. This is achieved through `on-the-fly conversion' (see SUN/55).
When this scheme is in use, you need not include explicit file types for
all input file names. If no file type is given, the file with the highest
priority file type amongst all files with the specified base name will be
used. The priority of a file type is determined by its position within the
list of file types given by NDF_FORMATS_IN
environment variable . File
types near the start of the list have higher priority than those that
follow. Note, native NDF files always have the highest priority and will
be used (if they exist) in preference to all other files types.
KAPPA --- Kernel Application Package