This standard specifies protocols among service composition (SC) functional entity (FE)@ service discovery and negotiation (SDN) FE@ context information management (CIM) FE@ service routing (SR) FE@ and service policy decision (SPD) FE to support service composition capabilities in a Next Generation Service Overlay Network (NGSON). The capabilities of service composition aim to support service chaining and instantiation@ specification interpretation@ service brokering and execution@ and context-aware and dynamically adaptive service composition. Purpose The purpose of this standard is to enable network operators@ service/content providers@ and end users to provide and consume composite services based on advanced service composition capability of NGSON with contextaware and dynamically adaptive features. This standard provides interoperability of composite services between network operators and service providers.