User interface development is one of the hardest parts of the software application development. It could be made more efficient by introducing model-driven development approaches and user interface modelling. This paper introduces a textual domain specific language and a corresponding meta-model for describing user interaction using abstract UI patterns that can be transformed into more platform specific UI patterns during application generation. The language also follows use case description format and provides possibilities to add free-form documenting context to the formal constructs used in the language, making the models described in the language suitable both for model driven engineering and requirements elicitation.
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