The concept of a scope is used for the user interface. The scope can be either global or resource specific. The default scope is global.
In the global scope, the add subcommand and the select subcommand are used to select a specific resource. The scope then changes to that resource type.
For the add subcommand, the end or cancel subcommands are used to complete the resource specification.
For the select subcommand, the end or cancel subcommands are used to complete the resource modification.
The scope then reverts back to global.
Certain subcommands, such as add, remove, and set, have different semantics in each scope.