Using a command line script to export from Omnigraffle

From time to time I draw a bunch of diagrams in Omnigraffle, and then need to
convert them all to a format I can show in a web page. If I only have one or two,
then doing it each time works ok. But if I have a dozen or more, then I find it
easier to have a script. That way I can safely export them all whenever I need
to.

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