Modelling tools provide weak or no support for the rich semantics of composite structure, such as enforcing connection constraints and maintaining referential integrity. Tools that generate code from composite structure typically depend on excessive and complex internal class representations such as Actor or BasePort. In this paper, we present easy-to-comprehend syntax describing composite structure in Umple. We describe a novel protocol-free approach that dynamically extracts communication protocols as a way to ease component-based modelling, and lead to concise and optimized code generation. We outline Umple composite structure features, and the related code generation patterns that resolve difficulties around connections and the integrity of multiplicity constraints.
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