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The argument to DEFINE or MATCH command can
optionally be modified before being used in actual search. This
allows, for example, to input search terms in transliteration instead
of in the actual script. Such a modification is called input
conversion. Each conversion is identified by its name. Conversions
are implemented by convertors, which are defined in loadable
modules, so you will need to load the appropriate ones to be able to
actually use them.
This statement associates one or more converters with the database. Each converter takes a word as input and produces another word on output. If the list of converters is specified, then the produced word will be used as input to the next conversion and so on. Output from the last conversion will be used as the actual headword to look up.
See greek_kbd, for an example of using input convertors.