Although transformation is an essential operation of model driven approaches, others kinds of model manipulation are required and are under study (composition, merging, audit, ...). For these manipulations, transformation languages are not always well-adapted and a solution consists in performing them by using an API automatically generated from metamodels. However, despite their benefits for representing and processing models inside applications, the use of such APIs is rather complex. To limit this complexity, we propose to exploit the flexibility of scripting languages and integrate into such language functionalities dedicated to models manipulation.

This site proposes an extension of the javascript language in order to get a dynamic and simplified access to any kind of EMF model (metamodel, metametamodel). Models and their elements are exposed as Javascript objects and every manipulation can be done with simple Javascript expression used in an interactive or batch mode via script. This extension can be used for numerous model driven activities such as metamodels prototyping and interactive modelstesting.

The scripting mechanism preserves the semantics (well-formed rules) and the functionalities (XMI support, change notification) provided by the implementation of EMF interfaces. Therefore, it is completely compatible with the processes and tools that are based upon these interfaces