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The telecommunications industry has always been service-oriented. However, the convergence-driven need to deliver seamless services across different access networks has forced operators to embrace new approaches, including the intelligent network, Web-services-based APIs, and, most recently, the IP multimedia subsystem. Today, SOA is considered state of the art for service-delivery platforms. Such platforms for value-added services have evolved from the intelligent network (IN) and object-oriented programming interfaces to recent Web-services-based platforms. They've exploited the most recent information technologies to implement an open set of service components. Web 2.0's recent emergence, meanwhile, has further pressured telecom companies to implement an open service market based on an open set of enabling services and service components.