Defining metamodels with Xcore is a lot easier than with EMF and Ecore. The problem is that I need the metamodels as Ecore files. Is it possible to export Xcore model to Ecore model? I don't see any export options in Eclipse.
The official Wiki describes how to export an Xcore model to a GenModel. It looks like the same can be done with the Ecore Model. Especially because the author mentions:
[...] Xcore resource does physically contain a GenModel and an Ecore model [...]