Acceleo 3.0 has just been released and we have a lot of questions about how to migrate from Acceleo 2.x to Acceleo 3.x? Acceleo 3 has some differences with Acceleo 2, especially for the new syntax elements based on the Model-to-text OMG standard.
The question is : How to create the 3.x '.mtl' file from the 2.x '.mt' file?
The tooling will initialize the migration process... Just right click on the Acceleo 2.x project.
We know that the migration can't be perfect, because the MTL standard is statically typed. Sometimes you need human understanding to provide the right context and get the right equivalence. You will probably have to change the way you organize your code generators. We are confident that Acceleo 2.x users will move easily to Acceleo 3.0.
Don't worry, the Acceleo Team will continue to maintain the 2.x syntax of Acceleo. However, the new major versions and the new features will take place on Eclipse.org.
There aren't a lot of differences between the old version of acceleo and the new one. It's not so long to migrate from a syntax to another, but you should do that only if you have at least one day free. Note that it can be a little bit more for big code generation modules. Acceleo 3.0 comes with an equivalence documentation.
I hope that it will be useful...