This schema defines the XML structure that the admin server expects from the catalyst server. The root element. An instruction request can contain 1 or more requests. A request must outline: (1) The action to be taken. (2) The application on which action is to be taken. (This can be optional if the action is to request information about all known application instances.). The list of actions that are to be carried out by the server. The list of information requests. These are used to request information for specific application instances if specified. If application instances are not specified, the server replies back with information about all instances about which it has information. The type of application. The name of the application. The environment in which the application is executing. The environment types are enumerated. For instance: QC. Development environment. QC environment. Production environment. The IP address of the host on which the application is executing. The hostname of the machine on which the application is executing. The action to be taken. The list of valid actions are enumerated. The unique application specification on which the action is to be taken. The list of actions to be taken. In these instance, these are read_only actions. The list of actions are enumerated. This is optional in this case. If specified, the info is returned about the said instances.