Languages For Model Transformations
A model transformation may be written in a general purpose programming language, but specialised model transformation languages are also available. Bidirectional transformations, in particular, are best written in a language that ensures the directions are appropriately related. The OMG-standardised model transformation languages are collectively known as QVT.
In some model transformation languages, for example the QVT languages, a model transformation is itself a model, that is, it conforms to a metamodel which is part of the model transformation language's definition. This facilitates the definition of Higher Order Transformations (HOTs), i.e. transformations which have other transformations as input and/or output.
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