force updating using ssconvert

[bill lam <cbill lam gmail com>]

I want to update all gnumeric xml format file to the latest version
(currently 1.9.9). I tried using ssconvert in the form
  sconvert --export-type=Gnumeric_XmlIO:sax

However it seems ssconvert will convert nothing if the input file is already
the same format as the output.  Is there any workaround apart from doing a
round trip via biff format (which I fear would change semantic content)?

-- 
regards,
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