Hello Sylvain,
if you need to define a package structure to organize your enterprise model, can I recommend that you google "Zachman Framework" and read anything you can find written by John Zachman. You can buy books or get certified if you want, but it's not necessary to benefit from this.
You can also buy the Zachman Framework MDG from Sparx. It's overkill for me and I don't use this MDG but I think it will create the package structure and model organization that you want.
Personally I just make my own Zachman-like package structure as follows (as others already pointed out, just use "View" packages for everything, they are just packages). Each line below is a package; ">" shows the level of nesting.
Root element - XYZ enterprise model
> Context
> Concept
> Logical
> Physical
> Out of context
Inside each of above package, I have these sub-packages:
>>Data
>>Function
>>Motivation
>>Network
>>People
>>Time
Each new project has its own totally separate package containing diagrams that I created for that specific project. Whenever I create a new element (Actors, Use case, Class etc.) I either reuse or create it in one of the Zachman-like packages. This way I quickly build up a useful repository of enterprise elements that not only describe the enterprise, they also accelerate modeling for each successive project.
Hope this helps!
Richard
