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Our works on software architectures for highly dynamic environments, such as ubiquitous computing, led us to consider models at runtime. Indeed, the biggest challenge of these environments is adaptation, and its reactivity is a key concern. In this paper, we describe models of our dynamic service composition and adaptation approach, and the benefits of the use of metamodels. We explore how metamodels can be used at runtime, to enforce conformity of transformations results, when adaptation is seen as model transformation.