Version: 1.2-alpha (using KDE KDE 3.1.3) Installed from: Debian testing/unstable Packages Umbrello 1.1 won't open XMI made from Umbrello 1.2-alpha. It just says, "There was an error openning <file>"
Sorry, this is not possible. When we speak of "backward compatibility", we mean the other direction: It will be possible to load umbrello-1.1 XMI files into umrello-1.2.
What you mean is forward compatibility and yes, we don't want this to be possible!