Importing Umbrello XMI files

Hello,

I'm the author of the light-weight MDA tool pyswarm 
[http://pyswarm.sourceforge.net/]. The prototype can import XMI files (as 
Platform Independent Models), then transforms them to PSMs and generates a 
corresponding Python application which uses PostgreSQL databases to store 
persistent business objects, including scripts to setup the Python packages 
and initialize the databases.

Currently only XMI 2.1 files of MagicDraw are supported (for historical 
reasons). Now I would like to add support for XMI formats of other UML tools. 
I also plan that future pyswarm releases can export transformed models back 
to tool-specific XMI formats. Since pyswarm is a GPLed tool I prefer XMI 
exchange with Free Software UML tools.

For doing this I want to learn the differences between the XMI formats of the 
UML tools. As far as I understand this is not easy, but I hope it will be 
possible with a reasonable effort.

Thus I would like to know which UML and XMI versions Umbrello can export and 
which it can import (and eventually which Umbrello version).

And I would like to learn if there are significant differences or 
incompleteness to what the corresponding standards specify.

And, finally, I would like to know how stable the format(s) is/are. Especially 
since I'm still in alpha-phase I would like to avoid extensive update and 
maintanance work long before the first final release :)

I will build a test model with Umbrello which covers the features (eventually 
with work-arounds) I need to test with my generator, but it would help me a 
lot if you can provide me with the missing information.

In any case I'm looking forward to your comments. Thank you in advance.

Best regards,
Anastasios

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