want to start from and for the command that you want to
apply to this format. Internally the control is then passed
to #LFUN_BUFFER_EXPORT_CUSTOM.\n
- If absent, the default output format of the document is
- used.
+ If absent or *, then the default output format of the
+ document is used.
<DEST> If present, this argument provides the export destination
filename. Its containing folder will also be the destination
folder, where all the needed external files will be copied.