A piece of boolean state grouped with other boolean states. Of these states, only one may have a value of {@link Boolean#TRUE} at any given point in time.The values of all other states must be {@link Boolean#FALSE}.
If this state is registered using {@link IMenuStateIds#STYLE}, then it will control the presentation of the command if displayed in the menus, tool bars or status line.
Clients may instantiate or extend this interface.
@since 3.2
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