It has been requested that we add command-line capabilities
to import a document through one filter and export them
through another. So far no one, that I know of, has taken
on this effort, but it would not be a tremendously difficult
undertaking. The hard parts, decoding and encoding foreign
file formats, is already mostly taken care of.
As a side note, we don't have a matching import filter
for every export filter, and vice-versa. For example,
we currently do not have a Microsoft Word exporter, but
we do have an importer, so documents could not be written
to that format.
-- Shaw Terwilliger