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In this paper we compare two approaches to the design of protocol frameworks -- tools for implementing modular network protocols. The most common approach uses events as the main abstraction for a local interaction between protocol modules. We argue that an alternative approach, that is based on service abstraction, is more suitable for expressing modular protocols. It also facilitates advanced features in the design of protocols, such as dynamic update of distributed protocols. We then describe an experimental implementation of a service-based protocol framework in Java.