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It should be nice to ensure backward compatibility from a version of Papyrus to another version. The compatibility should be only ascendant, i.e. it should be possible to open old models with a newer version of Papyrus tool. It concerns: - new version of UML language - new version of profiles, e.g. SysML - new version of GMF notation - new version of "diagrams", i.e. the content of the diagrams which can evolve with the version of the editors.
Backwards compatibility of diagrams is a must. See Bug 400209.