nd their trusted environment given by their owned subscriber base. One of the most promising XaaS models exploited SO far by Telecom providers is the investigation into the value chain for the SaaS model. Given their experience in service delivery platforms, brining those platforms into a carrier cloud promises an acceleration of new service creation market via PaaS/SaaS business models. The Telecom provider appears not only as a host of SaaS services and applications, but mainly opens up as SaaS aggregator via a PaaS-enabled SDP with open standard- ized Telecom service APIs for open service creation. Business customers can be provided with a one-stop-shop for their applications needs combined with single- sign-on services which offers to support any business model combining public, pri- vate, or hybrid cloud models. A SaaS aggregation platform needs to enable support for the full service life cycle including customer life cycle, for example, for provisioning, activation, deac- tivation of services and respective customer support, security, and policy manage- ment, charging and billing support, performance and SLA management up to the service catalog services, and customer self-service portals for service ordering, pro- visioning, and administration. The TeleManagement Forum (TMF) has defined Service Delivery Platforms the blue-print of a service delivery framework (SDF) defining the whole service management ecosystem for service delivery and life-cycle management [9]. The SDF service model is complemented by data representation to support SDF Service Lifecycle Management which aims at covering also contextual information of a service in relation to the business and operation environment, as well as the unified life cycle management of services that they or their dependencies may be managed in different frameworks, regardless of How the service has been created, for example, SDP, IMS, Internet access, Web 2.0, cloud computing, in broadband network, in service provider domain, or in another domain. How the service