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A template for relation member recurrence specification.
- The first unnamed parameter is the minimum members of a role that can be present; i.e., a non-negative integer.
- The second unnamed parameter, is the maximum members of a role that can be present; it can be a positive integer,
-, or empty/undefined.
-indicates that there is no maximum. If the parameter is empty or undefined, the maximum is take to be the same as the minimum.