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UML is the main modeling language used in model-driven development (MDD). In many cases, UMLbased modeling systems need to be extended by plug-ins to support different modeling approaches. This paper proposes a conceptual framework for model-driven development of plug-ins, which enables reuse of UML modeling capabilities for defining executable plug-in models. This approach suggests that UML-based modeling system should provide for their users a set of extension profiles that make up Application Modeling Interface (AMI), which is MDD alternative to Application Programming Interface (API). The paper describes three cases of AMI -model validation, methodology wizards, and model patterns -and sample plug-in models based on them. The presented samples are implemented in MagicDraw, which is one of the most popular UML-based modeling systems worldwide. The paper also discusses the benefits and drawbacks of the proposed approach and its further research directions.

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Abstract. The paper describes a conceptual framework for model-driven development based on a concise application of UML and modeling tool functionality. A case study of modeling software for library management is presented as an illustration of how to apply the proposed framework. Modeling tool features such as model transformations, code generation cartridges, model validation, dependency matrix, model metrics, model comparison, and model refactoring are presented as enablers for efficient model-driven development. The presented ideas and samples are based on industrial experience of authors who work as trainers and consultants for the modeling tool MagicDraw UML.