该标准定义了云到云互操作性和联合的拓扑、功能和治理。拓扑元素包括云、云之间调解治理的方法以及云之间的数据交换。功能元素包括名称空间、状态、消息传递、资源元数据和信任基础设施。治理要素包括注册、地理独立性和信任锚。该标准不涉及云内（云内）操作，因为这是特定于云实现的，也不涉及专有的混合云实现。定义了一组核心联合函数的API。该核心集涵盖了用于资源发现和资源访问的身份、身份验证和基于策略的授权。该标准为云到云联邦和互操作性奠定了基础。

This standard defines topology, functions, and governance for cloud-to-cloud interoperability and federation. Topological elements include clouds, methods for mediating governance between clouds, and data exchange between clouds. Functional elements include name spaces, presence, messaging, resource metadata and trust infrastructure. Governance elements include registration, geo-independence, and trust anchors. The standard does not address intra-cloud (within cloud) operation, as this is cloud implementation-specific, nor does it address proprietary hybrid-cloud implementations. An API for a core set of federation functions is defined. This core set covers identity, authentication, and policy-based authorization for resource discovery and resource access. This standard lays the foundation for cloud-to-cloud federation and interoperability.