Cloud Interoperability has been a core issue pertaining Intercloud and Cloud Federation. Several vendor-based proprietary solutions and open-source middleware are present for the resolution; however, these solutions are highly coupled to particular cloud environments. For heterogeneous clouds to exist in an interoperable environment, the need of a vendor-independent, secure and reliable message exchange middleware is critical. In this paper, considering general cloud architecture, we are

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... ing a Publish-Subscribe based middleware for Intercloud Message Exchange. Intercloud Message Exchange is an implementation of Data Distribution Service (DDS). DDS's reliable pub-sub messaging in conjunction with our devised Information Model can be a novel candidate for messaging domain of Intercloud Interoperability Standards. This Information Model also hosts an OWL based Cloud Resource Description Ontology, utilized by cloud environments for resource cataloguing and possible matchmaking prior to workload migration between heterogeneous clouds.