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SLAs play an important role for the QoS-driven service composition. Meanwhile, the temporal constraints are one of the main elements in the management of SLA especially in specifying the validity period of the QoS offers. In practice, the temporal constraints should be generated dynamically by taking the resource capability of the provider into account. The generation should consider various parameters that influence the resource capability such as the expected duration of the required Web service, the amount of current utilization, the amount of available resources, the number of required time slots, etc. Therefore, this paper aims to elaborate this issue and present a temporal constraints formation for SLA negotiation framework. This framework is proposed in the context of service selection and SLA negotiation. It provides the foundation towards the dynamic formation. This paper also demonstrates the initial approach of temporal constraints formation.