In this article we present high-level architectures for e-Government applications. These architectures depend on a country's strategy for e-Government integration and they give rise to two major issues. The first issue is how to guarantee semantical quality of information regardless of the chosen architecture. The second issue is how to facilitate sound transition of e-Government applications from one architecture to another under evolutionary pressures of a country's political strategy. In order to address these two issues we use Model-Driven Engineering which places metamodels, models and their transformations at the core of the engineering process. Overall semantical quality is thus guaranteed by metamodels while model transformations guarantee soundness under evolution.
We propose two adjustments to OMG's architectures for Model-Driven Engineering of highly-complex application domains. In OMG's architectures, a metamodel describes an application domain (reusable information) while a model describes an application (contextual information). By introducing a reusable model for a family of applications, we can share pieces of model-level information.
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