| http://www.w3.org/ns/prov#value | - Perrouin et al. propose a flexible, tool-supported derivation process in which a product model is generated by merging UML class diagram fragments [64].Acher et al. [101] point out that quite often however, there is a need to compose and decompose variability models at the abstract modeling level, because variability exists across very different concerns of an SPL [59]: from functionality (e.g., p
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