eMDE provides the top-level meta-model shown bellow. It aims to define the data structure allowing extensible elements to host their extensions.
| Element | Top metaclass |
| ExtensibleElement | Metaclass providing the ability to dynamically aggregate new properties, named ElementExtension |
| ElementExtension | New property from a viewpoint metamodel which can also be extended |
| Name | eMDE.ecore |
| Location | org.polarsys.kitalpha.emde/model/ |
| Ns URI | http://www.polarsys.org/kitalpha/emde/1.0.0 |