I have an existing Ecore model that I would like to modify. For modifying I would like to use Xcore. An answer to another question says, that it is possible to import classes from an Ecore model to an Xcore resource. However since I would like to change existing classes, this doesn't work for me.
Reading the eclipsepedia entry for Xcore nor searching the web didn't bring anything useful.
So how can I create an Xcore resource from an Ecore model?
A eclipse forum entry led me to the correct path:
First you need to create a genmodel for the ecore model. This is done via New -> Other -> EMF Generator Model and following the steps in the wizard. After that go to the context menu of the genmodel and select Export Model... -> Xcore and follow the steps in the wizard.
EDIT: In the meanwhile I also found the mentioning of this in the Eclipsepedia article: http://wiki.eclipse.org/Xcore#Converting_a_GenModel_to_an_Xcore_Model