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Projects are, in general, tied into CVS or subversion. This allows groups of people to share their code. Platform-Independent Model UML projects are not shareable.
workaround: add the uml project directory to version control outside of the ide manually and voila... you can use subversion commands through the main menu (the context menus are still missing)
*** Issue 89378 has been marked as a duplicate of this issue. ***
It seems that this bug has been fully addressed in NB 6.1. Whenever you create an UML project (platform independend, java platform, etc) you can easily import it into a repository (I only use cvs, can't comment on subversion) by using the versioning menu; "versioning -> CVS -> Import into repository". I am a little reluctant in changing aspects of this bugreport since its aimed at 5.5 and my discovery is on 6.1. However; as far as I know (not sure) 5.5 is no longer maintained.