The types of user IDs Nodes are described in terms of their images or hardware requirements. This description may be empty Capacity value and type of cut The types of credentails used for remote project access A user consists of one or both of an identifier and an access credential. A general attribute value pair for passing federation parameters and preferences An estimate of the resources than a federated experiment may require A project name and access user The information needed to swap an emulab experiment in The full on request type. The full on response type.