I am new to Ecore,My question is in Two parts: Part one I would like to know if I can create 3 metamodels in One EMF project and associate them. In other words, Assume I need to build MMA, MMB, MMC, is it possible to make a Ereferences between MMA and MMB or MMB and MMC. The other part of the question, can I make one Eclass Attribute in MMB of type Eclass from MMA.
I'm afraid you asked on the wrong forum. This forum is focused on EcoreTools which is a diagram editor for Ecore models, not on EMF itself. You should ask your question on the EMF newsgroup, no doubt you'll get a quick response there : http://www.eclipse.org/forums/index.php/f/108/