The use of the UML notation for software specification leads usually to lots of diagrams showing different aspects and components of the software system in a several view. Complex components are constructed by composing in parallel some elementary components and as a result the overall architecture of the system is described as a hierarchical composition of primitive components, which at the execution time may be deployed on distributed environment. The task of specifying such a system quickly becomes unmanageable without the help of some structuring tools. This paper discusses how the UML package's nested structure can be maintained and visualized with the help of a graph transformation mechanism based on the edNLC class of grammar.
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