OK, .
1) By default graphical diagram opens by selecting file with
*.foo_diagram ext and XML editor opens for second file. Is it possible to
open diagram editor for both files?
2) By default in XMI file for connections source and target saves with
IDs, but I know in EMF it is possible to save them with position
references, where can I change it?
3) I tried to change default generation of position references but I
didn't understand where, when and how it makes. Can You help me to
understand this?