The nested package is managed at diagram
and xmi level.
At graphical level the nested package is
important to immediately visualize the project strucutre.
What is more important and not really visible is the eclipseUML 2008
package feature which allow to model at project level and not just
at package level.
The XMI serialization is crucial at this stage in order to keep
project logic between the java code and the model strucutre in order to
add
iterative
project merge.
RSA® 7.5 can only work at package level which is serious limitation
for
java modeling.