With refactoring, the internal structure of a software system changes to support subsequent reuse and maintenance, while preserving the system behavior. To maintain consistency between the code (represented as a flow graph) and the model (given by several UML diagrams of different kinds), we propose a framework based on distributed graphs. Each refactoring is specified as a set of distributed graph transformations, structured and organized into transformation units. This formalism could be used as the basis for important extensions to current refactoring tools.
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