importing poseidon xmi files

Hallo!

I tried to open a poseidon project in argouml 0.22 and have many problems:

I managed it to load the file in ArgoUML, when I delete all tags with 
UML2 in the xmi file and turn on the user preference to ignore Diagram 
elements (in user preference Settings dialog - as explained in the FAQ).

Then I have all my classes, but not the diagram ... :(
Is there a way to generate a new diagram from that ?

Or any other possibility to import the poseidon file (maybe an external 
converter) ?


Many thanks,
LG
Georg