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This paper describes IBM's and Telefónica's joint work in progress in the field of Domain-Specific Modelling applied to Autonomic Network Management in the context of the European IST FP6 project MODELPLEX. In modelling edge-of-network devices which act as service access points from consumers to the telephone network, we have introduced a dynamic aspect to the network topology which affects the way Service Level Agreements (SLAs) should be modelled and processed within an autonomic management control loop. It is suggested that it is not possible to separate system and rule for managing services across a service-provider network.