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The application of clouds has become more and more prevalent over recent years. The operation among many different clouds faces a significant challenge due to the interface diversity and architecture differences. In this article, we address this interoperability problem by providing a uniform authentication, routing, delivery, composition and registration mechanism. Via NGSON, the adaptation, dynamic message routing, policy control, cloud transfer, and cloud composition operation can be provided for intercloud operations. This article also presents case studies of NGSON with capability to support inter-cloud operations.