first of all I think sirius an amzing tool and the more I use it, the more I like it.

I was wondering if there is an easier way of doing the following:

I have a Diagram Description, with around 10 Nodes. All domain classes of those 10 nodes have the same SuperClass.

Now I want to have a new node (completly different domain class with a reference to the superClass) as well as a realtion based edge, which connects to one of the 10 earlier mentioned nodes.

Right now I have to select all 10 nodes in target mapping for the relation based edge. Is there any way to group the 10 nodes and then select the group in target mapping? It is not a problem yet, but as the number of nodes grows, the more it becomes a problem to not miss some nodes at the target mapping for a new realtion based edge.

From what I understand, you would like to select the target mapping using some kind of computed expression (i.e. not in extension). This is not possible right now. It's not the first time we get this kind of request, but we've resisted adding this kind of feature because it would require knowledge of the VSM metamodel from users to write the expressions, making the VSMs more complex to understand (almost self-modifying code), to analyse, and to evolve (any change we would make to the metamodel would risk breaking such expressions).

In general when this kind of need arises, there are some other features of Sirius that can solve the issue, or at least mitigate it. The details depend on your concrete case, but one possible approach in a case such as yours would be to reduce the number of Node Mappings (in the extreme, to a single one), and use conditional styles to keep the different variants graphically different. If possible, this would reduce the maintenance (but maybe not completely eliminate) burden as the Edge Mapping would only need to point to one/a few Node.