What do you mean by package merge ?
Do you mean to be able to have an UML Superstructure having nested
packages ?
Do you mean that project information such a classifier in Package 1 and
another classifier in package 2 which can have dependencies need to be
saved in the UML Superstructure model ?
I remember that in 2006 we have this discussion inside Omondo and that we
had to find a workaround to support nested packages with EMF. I don't
remember anymore how it works but if you keep looking you will definitely
find the solution. It was a really very long and painful job but we did it
because we are toll vendor and this is our job.
If you have no time and a budget to purchase our very very expensive tool
then you can try our EclipseUML build for Eclipse 3.4 and 3.5.
You have graphical and UML superstructure nested packages support.
Sorry to come back to sell Omondo's tools but the package merge is an
important point and what I have seen with other open source projects is
not what should be done !! I think that this package support is very
important. Do not hesitate to send us an email for a quote at sales at
omondo.com
Thanks,