Abstract editor component?

Do you mean something like the possibility to extend existing EditorComponent for sub-concept, so editor will use most specific EditorComponent defined based on the concept of underlying node?
Unfortunately this feature is not implemented yet.

Hmm, I need this thing too

Hopefully in the next version we'll have this feature.

I created a language that might do what you want.
Here you can find the plugin: https://github.com/slisson/mps-aec/wiki

Oh wow. I'll check it out (don't have MPS with me atm).
On the other hand I've been trying to modify the source experimentally to see if I could create a multiline, wrapping-enabled, string property editor cell. With this, MPS editors would be much more powerful for languages that are more text-based (HTML, LaTeX, etc.). I've got the layout to almost work (having problems with left/right gaps), but haven't done the hit testing and caret drawing yet. But the code is already in a mess.
Slisson, how feasible do you think this idea is?
Alex, do you think a future version will support multi-line property editor cells?
thanks.

My approach to this was to create a MultiLine-Concept with Line childs. It does not allow to edit a property, but is much easier to implement. After adding some action- and key-handling it was pretty close to a normal text editor.

Maybe it is possible to build a multiline editor cell in a similar way by reusing collection- and property-cells.

Actually that's a great idea that I somehow didn't think of! Let me try that :D

Alex, do you think a future version will support multi-line property editor cells?

I doubt it will...

Wow!
This language is even packaged as a plugin!

We are currently working on creating new platform "MPS" on JetBrains plugins repository site: http://plugins.intellij.net as a result you should be able to simply upload your plugin there to make it available for everybody.

I tryed that, too. Here you can find the result: http://github.com/slisson/mps-multiline/wiki