# concept[].definition
Any number of the actions in the group may be chosen, from zero to all.

# concept[].definition
All the actions in the group must be selected as a single unit.

# concept[].definition
All the actions in the group are meant to be chosen as a single unit: either all must be selected by the end user, or none may be selected.

# concept[].definition
The end user must choose one and only one of the selectable actions in the group. The user SHALL NOT choose none of the actions in the group.

# concept[].definition
The end user may choose zero or at most one of the actions in the group.

# concept[].definition
The end user must choose a minimum of one, and as many additional as desired.