EMF Facet and EMF Profiles are two lightweight extension mechanisms for EMF models. With both tools you are able to extend or annotate your existing models with additional information without having to modify the metamodel they conform to (which as we all know would be a real pain in the ass! and could force you to recreate your modeling environments).
The following presentation given at EclipseCon 2012 presents and compares both approaches so that you can choose the one that best fits your needs (and since AtlanMod is collaborating with both, feel free to ask any question you may have!).
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