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PMDF's native conversion facilities are fairly limited, so the ability to call external converters is crucial.
For complex conversions of message attachments using external,
third-party programs and site-supplied procedures, such as document
convertors, see Chapter 22. Such complex conversions can be
performed by the script and conversion
channels.
Invoking the conversion channel is controlled by the
CONVERSIONS mapping table, and invoking the script channel
is controlled by the SCRIPT mapping table. The conversion
channel or the script channel is then run to execute a site-specified
external conversion procedure.
The PMDF conversions file, discussed in Section 22.1.3, is used to specify the details of external CONVERSIONS table triggered conversions and to specify the details of some internal CHARSET-CONVERSION table triggered conversions.
If you have both a CONVERSIONS mapping table and a CHARSET-CONVERSION mapping table, the CONVERSIONS mapping table takes precedence. In this case, all entries with RELABEL=1 in the conversions file
are skipped. A conversions file entry can be changed from being
associated with the CHARSET-CONVERSION mapping table to being
associated with the CONVERSIONS mapping table by replacing the
RELABEL=1 parameter with the COMMAND
parameter. The command specified could be as simple as copying the
input file to the output file.
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