Dear Landon,
I also think that the DXF choice, although I understand the familiarity
concern, will at the end prove to be rather cumbersome.
From the e-mails I read I also support the UML case but if you do not
feel that the OO model is close to what you want to do, you could also
try either E-R as suggested or I would also suggest, since you also want
to capture metadata, a look at the semantic modeling ideas. Also it
might be a good idea to separate some modelling concerns like the
physical storage and the conceptual part.
I suppose that this is not very helpful as it is too generic but it
might be a good idea to look into that.
Best,
Dimitris
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