Relationships Between Metamodels and Target Models
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In this article I have mentioned three potential target uses of an external DSL. I want to restate these here in the context of metamodels to show interesting relationships between metamodels and target artifacts or models. it is also important to pay special attention to reusable bags, as this has become an important issue these days.
Here are the three targets I have mentioned: the DSL source model could be parsed and translated into source code to become part of your application; the DSL source model could be parsed and interpreted in your application’s runtime environment; the DSL source model could be parsed and translated into another form of data for your application to consume at runtime.
The first use of the metamodel, to achieve target source code artifact output, is a straightforward albeit usually more complex one. Essentially you are transforming one or more source models into a metamodel and then into a set of target models (or source artifacts).
The last two variations, interpreted and translated data format, have similarities because an interpreted model and any other form of translated data are just varying types of metamodels. In essence taking your metamodel built by your parser and turning it into another data format supported by your application could be thought of and even be executed as a model-to-model transformation. But the point is, it can remain a metamodel. This notwithstanding, if you persist the data format metamodel rather than keep it only in memory, a final persistent transformation as part of a generative process will need to occur.
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