This code system http://hl7.org/fhir/action-selection-behavior defines the following codes:

CodeDisplayDefinition
anyAnyAny number of the actions in the group may be chosen, from zero to all
allAllAll the actions in the group must be selected as a single unit
all-or-noneAll Or NoneAll 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
exactly-oneExactly OneThe end user must choose one and only one of the selectable actions in the group. The user may not choose none of the actions in the group
at-most-oneAt Most OneThe end user may choose zero or at most one of the actions in the group
one-or-moreOne Or MoreThe end user must choose a minimum of one, and as many additional as desired

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